India’s Hydrocarbon Outlook 2024 88 A Report on Exploration & Production Activities 12. SPITI-ZANKSKAR BASIN Spiti-Zankskar is a Category III basin, implying that the basin has entirely undiscovered inplace, that calls for intense exploration for a potential discovery. The geographical area of the basin partially overlaps with the state(s) of Himachal Pradesh, Jammu and Kashmir and Uttarakhand. Source: DGH Internal Source: DGH Internal The basin is situated within north-northwestern Himalayan Mountains along northern margin of India. The Basin exposes about 11,000 metre of Paleozoic, Mesozoic and a part of Lower Tertiary sediments. The elements of petroleum system in the basin are speculative. The basin comprises of sedimentary sequence of Precambrian to Eocene age. The basin has the close analogy with Potwar Basin of Pakistan. The Paleozoic and Mesozoic Plays of the Potwar Basin of Pakistan are used in the analogue study. These plays have four assessment units identified based on geological rationales. The basin has inherent complex structure, which calls for detail study for identifying probable entrapment. The Paleozoic shales of Carboniferous Po Formation, Late Permian Gungri Formation and Middle Devonian Lipak Formation having limestone-shale sequence (Minor Source) along with Mesozoic Shale are potential source rocks with average TOC 1.72%. The envisaged reservoirs are sandstone-conglomerates and limestones belonging to Paleozoic to Late Mesozoic. The Intermittent shales of the Paleozoic and Mesozoic sequence, wherever regionally continuous are believed to act as seals. The presence of several large anticlines, synclines, and fault-related folds could be possible entrapment.
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