PETROVIETNAM
Dgc diem vd sy phdn bo than, khi than he tdng Tien Hung mien vdng Hd Npi
ThS. BCii Tri Tdm, TS. Vd Tru
ThS.TrIn Van Nhuin, TS. Nguyen Trung Chi Viin Ddu khi Vlit Nam
PGS. TS. Nguyen Quang Lu^t Dgi hgc Md - Dia chdt Hd N6i
Phdt trien ngudn ndng luang mdi trUdc nguy ea cdc md ddu khi can kiit Id vdn di rdt quan trpng cho sUphdt ' trien ehung ciia ddt nudc. Khi than (Coal Bed Methane - CBM) khu vUe miin vdng Hd Ndi dd dUac ddc biit chuy trong I cdng tdc tim kiim thdm dd. Mdt sdphdt hiin khi quan trpng dd gdp phdn phdt trien vd dn dinh nin cdng nghiip dia I phuang. Tuy nhiin, tiim ndng khf cda khu vuc ndy vdn cdn Id mdt an sdldn, cdn phdi ddu tu nghiin cUu, dUa cdc Ung I dufig khoa bpc cdng nghi hiin dai di khai thdc, sddung, tdng trUngudn tdi nguyin quy gid ndy.
I Md dau
Khi than l i khi dupe sinh ra trong qua trinh than hPa,
! q u l trinh b i l n ddi ngudn thuc vat bj chdn vui trong thdi I gian dai dudi sU phat trien eua eie hoat dpng dja ehlt d i n idan ehuyen t h i n h than vPi mde dp b i l n c h i t khac nhau.
1 Qua trinh n i y d i sin sinh ra khi vdi ham IUpng metan (CH^) I ehilm tdi 96% p h l n khi edn lai ehu y i u l i etan, propan, 1 butan, pentan, nito, dioxide cacbon, eung co khi ed mpt
; lupng nhd lUu hujfnh, khdi lupng khi phy thude ngudn f gdc vat c h i t hdu ca tao than, mde dp b i l n ehlt... VPi dac tinh d i e b i i t cda than n i n p h l n IPn khi dupc luu gid ngay ' ehinh trong b i n t h i n cic via than, tap than. Nhu viy, than
• cung I I da chda, da sinh ra ehinh ngudn khi metan.
Than chi dupe t r i m dpng trong nhdng dieu k i l n dia ehlt, mdi trUdng n h l t djnh, mdi trudng ay la mdi trudng rhinh thanh than v l dupc gpi la mire/"dlm lay hay b i i lly".
I "Bai l l y " ay eo t h i l i l n thdng vdi bien thi mdi trudng l y (dupc gpi la paralic, ngUdc lai thi dupc goi la mPi truPng ilimnic "Dam l l y " paralic la nhdng vung t h i p , trung l i l n ituc, l l u d i i nhu cac dam p h i hay d c long hay trung song i n h l n h gan ke can, tiep giap b i l n , ndi ma cac m l n h vun thuc v l t can va b i l n eo the cung dupe t r i m dong. " D i m l l y " limnic la nhdng vdng trong d i t l i l n , luc dja t h i p , itrung nhu d c hd hay elc doan Idng sdng bj bd ddng (vi du: hd mdng ngua) m i eie v l t lieu thyc v i t t h u I n luc dja cd the dupc l i n g dpng.
Trong mdi trudng hinh thanh than, t h i n h p h l n hda hpc nUde v i loai thuc v l t s l ludn la Uu t h i q u y l t
dinh cho loai than se dupc thanh tao va k h i nang sinh hydrocarbon... Trong mdt "dam lay tao than" cd the ed hai kieu than dUpe tram dpng: than humie va than sapropelic. Than humic la cac tich tu cua eae manh hdu ed hon tap daac tram dpng, trong mPi trUPng it nhilu cP han e h l oxy. Chdng la kieu than phd bien va thudng l i hon hdp cda vat ehat hdu ed t d eanh cay, la. Vi du, than humie la tieh tu t d cac d n h cay gay, la rung, cd sdng d dudi nude va quanh hd. Than sapropelic dUoe t i i lang dpng CO sy sang loc, tuyen chpn cua viec tich tu cic manh hdu cd d ndi cd ehe do ddng thuy van phu hpp.
Vi dy ed the la mdt phan eda dam l l y noi ma chi nhan daac eac la nhd, phan hoa (co the do gid thdi tdi) d i e b i i t giau "nhya", mpt t h i n h phan de d i n g chuyen hoa t h i n h hydrocarbon Idng.
1. Trang thai t o n tai khi metan t r o n g than Metan dupc than luu giiJf, hap phu gap 6 - 7 the tieh chda, bdi do than cd dien tieh be mat Idp ndi bp r l t IPn.
Thuc te cho thay cd tdi 98% lupng khi daac luu gid/ehda trong d c Id rong nen cua than va chi khoang 2% l i trong d c khe nut. CBM dupe than lUu gid vdi h i m lUpng khae nhau duPi d c dang nhu:
H i p phu be mat va khdng cd gidi han rd ring.
Hda tan trong nude ngam trong via than - loai luu giCT n i y it v i cd gidi han.
Vdi tfnh nang hap phu thi d i i n tich be mat (than) eing Idn thi k h i nang h i p phu khi eing Idn.
Cd 2 kieu hap phu xiy ra gida pha khf (metan) v i pha r i n (than) l i h i p phu v i t ly v i h i p phu hda hpc/thim hut hda hpc.
H i p phu v i t ly t h i hi|n lpc l l l n k i t gida d c p h l n t d khi v i than - k i l u h i p phu b l m i t . Khi n i n g h i p phy nay tuan theo lye Van der Waal. thUdng d l bj x l o trpn do lye l i i n k i t y i u . Do vay, n i n g lupng d n t h i l t d l p h i vd l i i n k i t niy eung t h i p . Cie nghiin cdu cho thiy, khi n h i | t t i n g thi mdc dd h i p phu g i l m .
Hinh l.Mo hinh s/n/i A/K cua than
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Hinh 4. tVlUc dd biin chdt cua than
Khi n i n g h i p phu khdng rd rang v l khdng ed gidi h chung phu thudc nhilu y i u td. V i khi cd tac dpngcOa ng d n h gay m i t c i n b i n g nhu i x m hut ha I p . . . chdng niit chPng m i t liln kit, nhung cung nhanh chPng (gan r ngay l|p tde) lly lai t h i c l n blng. NhUvly, kilu hip phui thupng cho khi ngay khi g i l m i p .
H i p phu hda hoe k h i ben vumg, do cd sullen kit i hoc qua lai gida eie p h l n t d khi va than. D l y la kieul k i t " phdc tap gida cic p h l n t d eua 2 pha: khi va rln. ( lien k i t n i y k h i b i n vdng v i eung ben vdng hon so lien k i t v i t ly, do vay, c l n mpt nang lUdng Idn hon so l i l n k i t v i t ly mPi du de p h i vd chdng.
CIc n g h i i n edu cho thay l i l n k i t hda hpc trong n idp hay t r i n mpt b l mat l i cd giPi han v l sd IUpng phSr lien k i t v i nd chi x i y ra ngay t r i n p h l n I3I mat cCial Nhy viy, elc p h l n t d l i l n k i t v l t ly thudng d Idp ng ehdng l i n cic p h l n t d l i l n ket hda hpc.
Khi ha i p mdi l i l n k i t n i y khdng bi p h i vd can l)<
ngay nhU k i l u h i p phy v l t ly, vi v l y nd cho dong khich hon h i p phy v i t ly. M I t khlc k h i n i n g h i p phu/luiil chda khi eda than edn phu thudc vao ap s u i t nhilt dfi dd I m , loai khi v i loai/nhin than...
2. KhIi q u i t d i e d i l m ^ a chlit khu vUc mien vong Ndi
M i l n vdng H I Ndi chiem h l u het p h l n d i i n tich di b i n g sdng Hdng. Trim tfch Kainozoi d d l y cd chilu t r i n dudi 7.000m it p h l n trung t i m va mdng d i n ra
36 Diu KHl-sd 4/2012
PETROVIETNAM
ben ria - d n h Ddng Ble v l einh Tiy Nam. Chung bao gdm elc thanh tao ed tudi t d Eocen, Oiigocen, Miocen v i Plioeen - D l td. Cie t h i n h tao n i y phd b i t chinh hpp len d c thanh tao k i l n true ed cd tudi t d t i l n Kainozoi vdi nhdng b i l n cd phdc tap v i n l m gida hai he udn n i p lay Ble vdi ele d i e trUng I I eie d i i d u true dang duPng, t u y l n phuong Tiy Ble - Ddng Nam v i he udn n i p Viet Bic cd cau trdc dang vdm vdi it thanh p h l n phun t r i o n l m d phia Ddng Bac.
i: Cdng t i e nghien cdu d u true, k i l n tao, h i thdng d l u i khf phuc vu cho viec tim k i l m t h i m dP vh khai thac d l u
• khi d day da tien h i n h b l n g nhilu phuong phap dja chat, ( dja vat ly, khoan... Cac k i t q u i nghien cdu nay da lam
I
" sing td phan n i o eau true dia c h i t d khu vyc nay v i d i p h i t h i i n dupe dau v i khi.Cac cau true cda m i l n vdng H i Npi dupe hinh thanh,
! p h i t trien t d dau Eocen v l h o l n thien vao cudi Miocen : sPm, duoc khdng ehe bdi eie ddt g i y ehinh phuong Tiy ' Bac - Ddng Nam, d i e b i l t l i 2 h i ddt g i y Idn: h i ddt gay ( sdng Ld d phia Ddng Ble va h i ddt gay sdng Chiy d phia ' Tay Nam. Trong pham vi bai b i o nay t i c gia trinh bay rd
! cae thanh tao tram tieh Miocen ndi ehung, dac biet la ' I\/liocen mupn.
Tram tieh Miocen thUdng la eac thanh tao cd do p h i n I g i l i ro t r i n mat eat dja chan gdm cac Idp d t ket, c i t bdt I k i t phan Idp x i i n c h i o xen ke nhjp vdi eie Idp mdng set I bpt ket, set k i t , set than p h i n Idp song song, thupc cac r nhjp bdi tich ehlu thd Uu t h i sdng hon bien. Mdi nhjp bdi I tieh chau thd bieu thj bdi
1 mdt ehu ky thay ddi mye 3 nUde tuong ddi trong be 1 vdi nhjp aluvi t d tho den 1 mjn va tUdng dng vdi mot I phu he tang t r i m tfch ' trong be.
He tang T i i n HUng
; tudi Miocen mupn (N|^th) ' bao gdm cac Idp d t ket,
! d t san ket xen vdi d c Idp ' mdng bpt ket, bdt s i t ket 3 v i set than. Cie Idp hat J thd ed dp day tang d i n
•i va nam chd y i u d p h l n i t r i n cua he t i n g , sy bien I ddi n l y the hien 3 ehu ky I ha thap d i n mye nude I trong be tfeh tu v i cudi
eCing da dan den sU b i o mdn t r i m tieh vdi nhilu noi thieu vIng mpt p h l n hole toan bp d phu tang Tiin Hung t r i n . Nghich d i o kiln tao da hinh t h i n h d c udn nep, nang dja phUdng, m i nhilu dinh d i bj b l o mPn. Sy tfch tu tram tfch chi x u l t h i l n trong d e trung nhd kep gida d c ddi n l n g nhu Phupng Ngai, Vu Tien, Odng Quan.
3. Cdu true - kien tao
M i l n vPng H i Npi l i p h l n k l o d i i v l phfa Tiy Bic cda b l t r i m tfch SPng Hdng tren dat liln, nhu viy qua trinh h1nh t h i n h v i p h i t trien cua m i l n vong H i Npi vda cd net tUdng ddng vdi be tram tfeh Sdng Hdng, nhung lai co lien quan m i t thiet vdi tien trinh p h i t trien cua cic he thdng ddt giy Sdng Hdng, Sdng Chiy va Sdng Ld:.,
M i l n vong Ha Noi chi la phan eue Tiy Bic cda be tram tich De tam IPn - be Sdng Hdng, sU phat sinh va p h i t t r i l n eua mien vong Ha Noi lien quan mat t h i l t v i chiu su khdng che cua eie h i thdng dut g i y phuong Tay Bic - Ddng Nam: h i ddt gay Song Chay P phia Tay Nam v i h i dut g i y Sdng LP d phfa Dong Bac.
Tren cO sd lieh sd phat trien dja chat, d i e diem cd sinh - dja tang, kien tao . cua tdng vdng, mien, eae nha dja chat da phan ehia mien vong Ha Npi thanh mdt sd don VI d u true la mdt trong cac co sd phan chia eae vung trien vpng CBM.
Oan nghieng ria Dong Bdc (cd van lieu ehi goi la ddi ria Ddng Bac) hay ddi v i n h ngoai (nhU mpt sd van lieu dja chat than hay gpi) nam ve phia Odng Bac ddt g i y
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iO KHi - SO 4/2012 3 7
Sdng Ld va chCt y i u dupe e l u t h i n h bdi d c t r i m tfch Neogen mdng (td 0 - 2.750m) trong cic trOng h?p v l cd xu t h i mdng d i n v l phia Ble, Tly Bic, chdng n i m ke thda l l n mdng. Don n g h i i n g gdm elc ddi n l n g , ddi syt n l m xen k l nhau ho^e t^io t h i n h day, b| chia d t bdi cie dyt g i y t h u I n theo phuong Tiy Ble - Ddng Nam hoic Ddng Ble - Tly Nam v i t?o t h i n h d c c l u t?o am duong nhU nhP Gia LUOng, trung HIi DUdng, n l n g Thanh H i , nhd T i l n Lang v i cic khdi n l n g dja phUPng khicnhUB10,B26,B6... vdi ehilu s l u mPng khdng Idn.
Mdt sd noi mdng cdn nhd cao, phoi Id l l n d t r i n b l m i t hi$n tai nhU khu vyc ndi Vol - Kiln An - HIi Phdng.
Trong pham vi ddi, ddt g i y Phi Lai - Ddng Trilu - C i m Phi (ddt gay dudng 18) cd vai trd d i e bi$t, vda l i ranh gidi v l phia Odng Ble cua cic t h i n h t?o mdng Paleozoi niy, vda l i ranh gidi gida elu true n i n sau - Caledoni v l trung Mezozoi cua khu vUc.
Ddi trung tdm mien vong Hd Npi l i p h l n d i l n tieh dUpc gidi han bdi 2 ddt gay ehinh: ddt gay Sdng Ld d phia DPng Ble v i ddt gay Sdng Chly d phfa Tiy Nam. D i y I I vung sut lun siu v l cd c l u true dia ehlt v i dac diem kien tao h i t sdc phdc tap. Chilu d i y t r i m tich Kainozoi d d i y Idn, noi d i y n h l t dat t r i n 7.000m va cd xu hudng chim d i n ra vjnh Bic bp, CO su p h i t t r i l n k l t i l p cda cac ddi t h i n h h i - c l u true trudc Kainozoi t d d c ddi ngoai ria ed trUde t i c h g i i n . Theo dac diem d u true v i k i l n tao, ddi nly dupe chia ra 2 phy dPi khae nhau bdi ddt gay nghjch Vinh Ninh.
Trung Dong Quan l i eau tao b i e eao eda be t r i m tfch Song Hdng, dupe giPi han bdi hai ddt gay chfnh la dut g i y SPng LP P phia Odng Bac v i ddt gay nghich Vinh Ninh d phia Tly Nam.
VPi k i t q u i tdng hpp cic t i i l i l u dja c h i t va dja v i t ly d l y du, chi t i l t eua Nginh v i ele don vj nghiin edu khie CO the phan t i n g c l u true dja c h i t khu vUc nghiin edu ra 2 t i n g c l u true chfnh:
+ Ting d u true trudc Kainozoi.
+ Tang cau trdc Kainozoi.
Tang cdu trdc dudi cdn cd t h i gpi l i tdng cdu tnic mdng trudc Kainozoi. t i n g c l u trde n i y bj vui Ilp bdi cie t h i n h tao t r i Kainozoi. Ting n i y ehl Id ra d p h l n ria Tiy Nam v l Odng Bac cua M i l n vdng H i Npi gdm elc t h i n h tao l i d c da b i l n ehlt gonai, da phien k i t tinh thudc phdc he Sdng Hdng tudi Proterozoi, cle d l phun t r i o ryolit poocfia thudc phdc h i Tam Dao va x l m nhap axit tudiTriat gida d phia Tiy Bac. Ngoai ra, con gap d c da lue nguyen tudi Jura sdm v i da vdi cacbon permi tai khu vyc ria Dong.
I 38 DAU KHi-sd 4/2012
Tdng cdu trOc trin hay cdn gpi I I tdng cdu trdcKalno^
thyc c h i t l i ldp phd Kainozoi, bao gdm t o i n bp dctr^m tfch ed tudl t a Eocen d i n D$ td. Chilu d l y ldp phd trim tfdi n l y k h i d i y > 7.000m, trung binh 3.000 - 4.000m gdm J t h i n h t?o lye nguyin, lye nguyin chda than v l lye n g i | ^ cacbonat, phO b i t chinh hpp l l n t i n g d u trde dudi. | P
Theo d^c d i l m thach hpc t r i m tieh, mdi trUdng ling dpng v i Ijeh sd hlnh t h i n h thi ed t h i p h l n t i n g clu trdc n i y t h i n h 3 phy t i n g d u trdc sau:
+ Phu t i n g d u trde dudi.
+ Phy t i n g c l u true glOa.
+ Phu t i n g c l u trdc t r i n .
Php tdng cdu true dudi gdm elc t h i n h tao cd tudi til Eocen d i n Oiigocen - d l y I I d c t r i m tieh hat thd: cuoi san c i t tudng lu tieh, bdi tich d p h l n dudi v l chuyin len p h l n t r i n l i t e l t I I c i t san, e l t bdt v i s i t thude tudng dim hd, ddng b l n g ehiu thd v i p h l n cao cd c i tram tfeh vung vjnh.
Phu tdng cdu true giOo gdm ele t h i n h tao ed tuoi til Miocen sdm d i n Miocen mupn vdi ele da lue nguyin c i t bdt xen ke v i c i c t h i n h tao v y n lue nguyen chijla than, p h i n Idp la ddi tupng nghien edu cua luan van.
Phu t i n g n i y n l m b i t chinh hpp len phu t i n g clu tnic duPi. D l y la c l e t h i n h tao duoe t r i m tieh trong mffl trUPng ddng b l n g e h l u thd v i xen ke ven bd.
Phu tdng cdu true trin dUoc c l u t h i n h bdi cie thanh tao t r i nhat: Plioeen v i D l t d , chdng phu bat ehfnh help l i n phu t i n g d u true gida gdm d c da luc nguyen, luc n g u y i n cacbonat dUdc l i n g dpng trong mPi trUPng co dpng nang y i u , bien ven bP v l vung vjnh, phin I6p g i n nhu n l m ngang h o i c song song cd dp dde khdng d i n g k l . D i d d l y chu yeu la d t , bpt v l set g i n kit yeu hole b d rdi. Cic t h i n h tao trong phy t i n g nay gin nhu khdng bj d e dut gay p h l n c i t .
Qua n g h i i n cdu d i e diem d u trdc cua t i n g cau tnic n i y cd the t h i y t i n g n i y d khu vyc mien vdng H i Noi 6i tdn tai cac mat b i t chinh hpp chinh tUdng duong vdi si k i t thdc cda mdt pha hoat ddng k i l n tao de rdi md dai eho mpt pha mdi t i l p theo:
+ Mat b i t ehinh hpp gida hai t i n g elu trdc dUtSi vi tren I I mat p h l n chia gida cic thanh tao c o t r u P c D I ^ v i cic t h i n h tao D l tam (mat mdng trudc Kainozoi). m + Mat b i t chinh hpp gdc trdng vdi mat phin cffl gida thanh tao dl^p Dinh Cao v l d i l p Phong Chiu la m?
mat b i t chinh hdp khu vyc. Nd dupc hlnh thanh v i o i ^
PETROVIETNAM
Oligoeen khi m l thPi gian tao dja hao, b i n dja h l o t i c h g i l n sdm k i t thdc, mat Oiigocen dupe n l n g l l n d i n d i n t h i l u v I n g tram tieh, mdt sd noi bj phong hda v i b i o mdn manh, sau dd bj d c tram tfch t r i Miocen phO b i t chinh hpp l i n t r i n v l tao thanh mdt mat bat chinh hdp gPc die trUng t o i n bd khu vye nghien cdu.
+ Mat b i t ehinh hpp gde trdng vPi mat p h l n chia dja t i n g glCfa Miocen va Plioeen eP t h i t h i y rd t r i n t o i n bd d i i n tfch vung nghiin edu. VI t h i nd eung dupe xem l i mat b i t chinh hpp khu vye, duoe hlnh t h i n h v i o cudi Miocen mudn. Phan dien tich Ddng Ble m i l n vdng H i Ndi dupe nang l l n chju bj b i o mdn, cdn p h l n Tiy Nam m i l n vdng H i Npi chju t i e ddng eda pha n i n I p manh, bj n l n g trdi sau do cung bj bao mdn e l t cyt, nhilu noi bi b l o mPn d t cut slu den gan het Miocen gida.
Ngoai ba mat bat chinh hpp dupc de c i p d t r i n , th1 theo tai lieu dia chin eon p h i t hien mat p h l n xa b i t ehinh hdp trong t h i n h tao Oiigocen, nhung d i y la mat p h l n xa chl mang tinh dja phUdng (Ideal). Con mat p h i n xa gida Miocen duPi v l Miocen gida la mat p h l n xa dUdc hinh thanh khi giai doan t i e h gian mudn k i t thuc, b l mat Miocen dudi dupc nang len trong mpt khoing thPi gian (khdng dai) va bj bao mdn nhung khdng nhilu, sau do bi eie t r i m tich Miocen gida - mupn phd tryc t i l p len.
4. D i e tinh va sU phan bd cac via than he tang T i l n Hung khu vUc mien v o n g Ha Noi
D i n nay dac tinh via than da daac nghien edu, trong h i t i n g Tiin Hung m i l n vong H i Npi cd 19 via than dUpc ddng danh t d 1 den 19 theo t h d t y t d dudi l l n {Blng 1). Trong dd 5 via chilu d i y duy tri tuong ddi lien tuc l i via 3,4,14,15,17.
Via 1 cd chieu day thay ddi t d 0,23 - 7,11 m, trung binh 2,18m, day nhat gap d Id khoan 4T, 7T. Nhin chung via cP ehilu day trung binh den mdng b i l n ddi nhanh khong dn dinh d u tao ddn g i i n . Via khPng cd gia trj cong nghiip.
Via 2 cd ehilu day thay ddi t d 0,40 - 2,95m, trung binh 1,02m, day nhat d lo khoan 1. Nhd vay, via cd chieu d i y mdng, khdng dn djnh d u tao tucffig ddi phdc tap, dp duy tri kem khdng cdgiltrjcPngnghiip.Via2eiehvia 1 I i l 9 m .
Via 3 cd chd Id dudi Idp phd D l td, via duy tri lien tuc trong toan khu Khoai Chau va cd g i l trj cdng nghiip, cho d i y nhat 19,09m, mdng n h l t 0,58m, trung binh 6,95m. Via cd chieu d i y tuong ddi dn djnh eau tao via tUdng ddi
ddn g i i n ed t d i d i n 5 Idp kep. Via 3 cich via 2 l i 12m.
Via 3a cd dp duy tri khdng l i i n tuc, khdng dn djnh.
khdng cd g i l trj cdng nghiip via d l y n h l t 10,10m mdng n h l t 0,16m, trung binh 1,29m. \fla 3a elch via 3 l i 15m.
Via 4 eP p h l n Ip duPi Idp phu O^ td, duy tri trong t o i n khu Khoii Chau trd mdt sd nOi bj v i t mdng, tuy nhiin via 4 cd g i i trj cdng nghiip. Chilu d l y Idn nhlt: 6,76m, nhd n h l t 0,19m, trung binh 3,08m. Via tUOng ddi dn djnh, elu t?o via tUdng ddl dOn g i i n . Via 4 cich via 3a I I 22m.
Via 5 cd nhieu chd Ip duPi Idp phu D^ td, p h l n bd trong t o l n khu Khoii Chiu, chilu via d i y via t d mdng d i n r l t mdng, khdng dn djnh, khdng co g i i trj cPng nghiip, cho d i y nhlt 2,19m, nhd nhat 0,15m, via 5 d c h via 4 l i 26m.
Cdc via 6, 7 v i 8 cung Ip duPi Idp phd D i t d va gap d h l u h i t Id khoan trong vdng, cie via than nay cd ehilu d i y t d mdng den r l t mdng, d b i i t ed diem chieu d i y t i n g ddt biln. Dp duy tri v i dn djnh kem, chieu d i y via 6 thay ddi t d 0,1 - 7,3m, trung binh 1,10m, via 7 ehilu day thay ddi tdO,10-5,02m, trung binh 1,05m, via 8 chieu day thay ddi t d 0,03-5,16m.
Nhin chung, via co d u tao phdc tap, vach tru via thuPng la Idp set ket, bpt k i t mdng. Rieng vach via 6 cd Idp set k i t mau loang id day 2 - 10m tUong ddi dn djnh, ddng lam tang danh d l u , ddng danh via va tap than. Cie via nay khdng cd gia tri cdng nghiip. Tap via n i y each via 5 l i 64m.
Via 9 la via than mdng ed chieu day t d 0,20 - 2,41 m, trung binh 1,00m. Via d u tao don giin, it Idp kep, duy tri
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'^ Hinh 6.Ddc tfnh hod 1^, cdng nghe tmng binh theo nhdn than ''-^c !han
khdng l i l n tuc. Via 9 each via 8 I I 36m, d c h via 10 l i 64m, l i khoing d e h dja t i n g gida cAc via tuong ddi xa.
Cdc via W, 11 U vd via 13 d l u cd chilu d i y mdng d i n r l t mdng, r l t khdng dn djnh, dd duy tri kdm. Chilu d i y via 10 thay ddi t d 0,1 - 4,46m, trung binh 0,93 m, via 11 d l y t d 0,39 - 2,79m, trung binh 1,00m. Chilu d l y via 12 thay ddi t d 0,40 - 3,69m, trung binh 1,26m, via 13 d l y t d 0,10 - 3,20m, trung binh 1,19m. Cic via n l y cd c l u tao ddn g l l n , vich try thudng g i p s i t kit, bpt kit, it khi g i p d t k i t h^t mjn. D i y l i d c via khdng dat chilu d l y cdng nghi|p, d l v l y quanh ehu y i u I I d i hat thd, cat k i t thach anh sing m l u , xen kep cic Idp bdt kit, s i t k i t mdng.
Bdng 1. Bdngthdngkicdcddc
Via 14 cQng Id dudI Idp phd D | t d cd chilu di n h l t 14,29m, nhd n h l t 0,38m, trung binh 4,89m, via i tUPng ddl l l l n tyc trong khu Kholl Chiu: dn djnh v i i t^o tUPng ddl ddn g i i n , ft Idp k^p, cd g i i trj edng n(
VIch try via I I s i t k i t , bpt k i t , via 14 cleh via 13II6C Via 15 Ip dudi Idp phd D | t d cd chd d l y via tdi 5 chd nhd n h l t 0,40m, trung binh 3,71 m. Via duy tri t ddl l i l n tyc trong t o l n khu Khoii Chiu, nhung mdm v l phia tiy. Clu tao via tUdng ddi ddn glln, chili tuong ddi dn djnh, via 15 cd g i l trj cdng nghiep cic H I i 85m.
Via 16 cd chilu d i y mdng d i n r l t mdng, khdn tinh ca bdn cOa cdc via than
Via
Chilu d i y via Nhd nhlt - LPn nhlt Trung binh (lln g$p]
0.30 - 5,68 0,96(14) 0.20-3.19 1,02(20) 0.29 - 19^09
^4,12 (35^ _ 0.69-3^56
1^,30J19) 0,l"9-6.94 3,23(35) 0,17-2.76 0,86 (13) 0.10-5.90 1,57(23) 0.20-4.14 1.24 (19) 0.20-4.62 1,11(17) 0,20-2.41 l,24j26) 0.10-2.49"
0.83 (21) 0.39 - 2.79"
1,00(19]
0.39-7.68 1.65 (18) 0.10-5.10 1,83 (22) 0.29-14.29
4,68 (36) 0.19-9.24 4,23(28) 0.49-1.60 1,03 (9) 0.30 - 9,71
3,96(19) 0.20 • 2.09 "
___ 0.87(10) 0.15-0.88
0,48(9)
O&c diim c l u tao cua via
Oan giin
Tuong ddi don giin Tuong d6i don gidn
Don giln Tuong d6i dOn giin
Don giin Phdc tap PhUctap Phdc tap Don giSn Don giin Don giin Don giin Don giin Tuang doi don giin
Tuong ddi dan giin Don giin Tuong dot phdc tap
Dem giin Dem gian ft Idp kep
€>ic tfnh 6n djnh cda via Khdng dn djnh KhPng dn dinh Tuong ddi dn djnh
Khdng dn d\nU Tuang ddi dn dinh
Khdng dn ^nh Khdng dn djnh Khdng dn djnh Khdng 6n<^nh KhPng dn djnh KhPng dn dinh Khdng 6n ^ n h KhPng dn dinh Khdng dn djnh Tuong ddi dn djnh Tuong ddi dn djnh Rit khPng dn t^nh Tuong ddi 6n <^nh Rlt khdng dn djnh l^t khPng dn djnh
Khoing cich via Nhd nhlt - LPn nhlt
Trung binh _
4.50-62.00 19 2.00-18,00
12 2.00-19.50
15 1.50-27.00
22 3.00-42.00
26 8.50-50.00
15 3.00-29J0"
13 4.50-72.00
36 6.50-90.00
64 41.00-98.00
19,00_
6.00-38.00 "
19 3.00 - 35.00
18 7.00-45.00
22 8.00-85.00
60 46.30-105.00
45
18.60-66.50 4S_
12.50-70.00
40 DAU KHl-Sd 4/2012
PETROVIETNAM
djnh, kem duy tri c l u tao ddn g i i n khdng cd g i i trj cdng nghiep, chd d i y Idn n h l t 1,58m, nhd nhat 0,80m, trung binh1,00m.Via16eiehvIa15li45m.
Via /7 cung Id dUdl IPp phd 0 1 t d cd xu the d m v l phfa Ddng Nam va duy tri tuong ddi lien tue. Chilu d i y via Idn nhat 9,71m, nhd n h l t 0,98m, trung binh 4,05m. NhU v l y via 17 cung ed chilu d i y tUdng ddi dn djnh, nhung elu tao via tUdng ddi phdc tap: cd t d 2 - 5 Idp kep, d i y I I via cd g i l trj edng nghiip, d phan v i c h try via thudng l i set kit, bdt ket. Via 17 cich via 16 l i 28m.
Via 18 va via 19 eung ed ehd Ip dUdi Idp phu 0 1 td, via cd chieu day mdng d i n r l t mdng. Chilu d i y Idn n h l t 2,09m, nhd nhat 0,15m, r l t k i m dn djnh, k i m duy tri.
Chieu day khdng dat chilu d i y edng nghiip, elu tao via don g i i n ft Idp kep.
5. Dac tinh than, khi than he t i n g Tien HiAig khu vUc mien vong Ha Npi
Than d mien vdng Ha Npi trong dp s i u nghiin edu d i n 2.000m chd yeu co ngudn gdc lye dia - limnic, thupc h i tang Tlin Hung tudi Miocen mupn (N,^th), co thanh p h l n vitrinit: 85 - 90%, inertinit: 1 - 3%; liptinit: 7 - 8%;
lupng khf than trong eae via than, tap than phy thupc vao mde dp b i l n chat than v l dp sau p h i n bd tap, via than v i cd xu the t i n g eao P p h l n sau hdn, trong khoing dao dpng Idn t d t d 0 den 2mVtan d p h l n nong, den 10 -15mV t i n d p h l n sau t d 1.500 - 2.000m.
Mien vong Ha Npi trong khoing do s i u 300 - 2.000m, khf than cPn dupe lUu gid v i b l o tdn tdt trong d c via than CO dp d i y Idn t d d d s i u 1.000 - 2.000m, tham chf s i u hon.
Cae phan dien tieh ven ria cd cie t h i n h tao chda than P dp sau nhd (80 - 200m) ft eo trfen vpng CBM.
Ket luan
1. Trong h i t i n g Tien HUng mien vdng Ha Npi eo 19 via than, eo ehilu day trung binh t d khoang 0,6 -2m, doi noi CO via den hon 4m, trong dP 5 via ehilu d i y duy tri tuong ddi l i i n tue ) l via 3,4,14,15,17.
2. Da phan elc via mdng, p h l n bd khdng lien tyc, khong cd gia trj cdng nghiep eao.
3. Than d mien vong H i Ndi trong dp sau nghien edu den 2.000m chu y i u ed ngudn gde lye dja - Limnic, thupc he tang T i l n HUng tudi IVIiocen mupn (N|^th), ed thanh p h l n vitrinit: 85 - 90%, inertinit: 1 - 3%; liptinit: 7 - 8%.
4. Lupng khf than trong d c via than, t i p than phu thudc v i o mde dd bien c h i t than v i dp s l u p h i n bd tap.
via than v i cd xu the t i n g eao d p h l n siu hon, trong khoing dao dpng IPn 0 - 2mVtln d p h l n ndng den 10 - 1 SmVtIn d p h l n slu t d 1.500 - 2.000m.
5. M i l n vdng Ha Npi trong khoing dd siu 300 - 2.000m, khf than cdn dupe luu gid v l b i o tdn tdt trong d c via than ed dp d i y Idn t d dp slu 1.000 - 2.000m, tham chi s i u hdn. Cie p h i n d i l n tfeh ven ria cd cic thanh tao chda than d 66 siu nhd (80 - 200m) it cd trien vpng CBM.
T l i lilu tham khlo
1. Ngd Tit Chinh, 1987. Kit qud tim kiim t9 m^ than khu Khodi Chdu - Chdu Glang • Hdi HUng. Bio d o LUu trd Dja ehlt.
2. Vu Xuan Doanh, 1975. Thdng tin Trien vpng than trong trdm tich Neogen ddi Khodi Chdu (Hung Yen) - Tien Hdi (Thdi Binh). Bio eio LUu trd Vien Dja chat - Khoing sin.
3. Vd Xuan Doanh, ^9S6. Do chda than mien vong Ha Ndi (Hung Yen - Thdi Binh). Bio eio LUu trd Oja chat, Dja chat-Khoang sin.
4. L i Hung, Vu Try, Phung SyTai, LUu Thanh HUng, 9/1988. Mil quan he giUa sinh thanh hydrocarbon vdi tram tich chPa than bi Sdng Hdng.Tuyit\ tap bao cao Hpi nghj khoa hpe: Dja chat - Khai thae than. Ha Npi.
5. Vu Try va nnk, 2011. Ddnh gid tiem nang vd kha ndng khai thdc khi than (CBM) tai ddi Trung tdm mien vong Hd Npi (Phu CU- Tien HUng - Kiin XUOng - Tien Hdi). Bio eio LUU t r d PAC.
6. Trin L i va Vu Ngpe Tiln,1987. Kit qud nghiin cijfu khai thdc cdc bang chdn delien kit cdc tap chda than viing Tay bac song Ludc mien vong Hd Ndi. Bio d o LUu trd TTTLDC.
7. Ngd Thudng San v i nnk, 1999. Cdu true d/a chat vd trien vpng ch^a dau khicua miin vong Hd Noi. Bio cao LUu trffVPI.
8. Bui Tn Tim, 2011. Tiem ndng than, khi than tai MVHN to 01-KTmien vong Hd NpL Luan v i n Thae sy Khoa hpe - Dai hpc Md - Oia chat Ha Npi.
9. L I Van TrUdng v i nnk, 2004. Nghien ctifu minh gidi lai tdi liiu dfa chdt - dia vdt /)?, xem xet lai cdc giing khoan khu vUc Tiin Hung, Kien Xuang, Ddng Quan D. Bao cao tdng kit, Bao cao LUu trO PAC.
10. Arrow Energy, 2009. Cdc bdo cdo ket qua khoan tim kiem thdm do CBM 16 MVHN-OIKT.
