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Dalaman Tungkal berada di Subcekungan Jambi, yang merupakan bagian utara dari Cekungan Sumatera Selatan.

Cekungan ini merupakan salah satu cekungan penghasil hidrokarbon terbesar di Indonesia. Terdapat beberapa batuan sumber di Cekungan Sumatera Selatan. Lapisan serpih dan batubara dari Formasi Talangakar (TAF) diketahui sebagai salah satu batuan sumber utama di cekungan ini, dan diharapkan juga sebagai batuan reservoir untuk gas serpih di Dalaman Tungkal. Data yang digunakan adalah data geologi permukaan sebagai analogi singkapan yang diambil di bagian selatan kaki Bukit Tigapuluh dan diintegrasikan dengan data bawah permukaan (data sumur dan data seismik) di Area Dalaman Tungkal. Studi ini menggunakan metoda yang terintegrasi antara analisis lingkungan pengendapan, analisis geokimia organik, analisis petrogra , interpretasi data seismik, deliniasi sweet spot dan perhitungan volumetrik.

Formasi Talangakar yang diobservasi di lapangan dan data sumur, disusun oleh serpih dan batulanau dengan sisipan batubara, batupasir dan batugamping. Formasi ini diinterpretasi diendapkan pada lingkungan transisi. Serpih dan batulanau Formasi Talangkar memiliki karakteristik yang berpotensi sebagai pembawa gas serpih, dengan kekayaan material organik yang cukup, tipe kerogen yang sesuai, mencapai kematangan pada jendela gas, dan tingkat kegetasan baik. Berdasarkan parameter yang telah ditentukan, diketahui net to gross 0.158, kematangan memasuki jendala gas pada kedalaman 10250 kaki dan luas area sweet spot mencapai 8.9 x 108 ft², dengan total potensi sumberdaya gas serpih dengan metoda Ambrose mencapai 2.12 TCF.

Kata KunciTungkal Graben, Jambi sub-Basin, TAF, TOC, brittleness index, sweet spot, Gas in Place.

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