Analysis of the key conditions for gas accumulation and favorable belt in 10000 meters deep clastic rock: a case study of the Mesozoic Kuqa foreland thrust belt

doi:10.3969/j.issn.1672-7703.2025.03.004

Abstract

Abstract: Ten thousand meters deep is one of the important areas of natural gas exploration in Kuqa depression, and it is a potential replacement area because of its large resources, good preservation conditions and convenient oil and gas charging. But there are still some key problems such as structural trap, scale reservoir and reservoir formation type.Based on the geological structure anatomy of deep structure, hydrocarbon generation potential evaluation, reservoir physical simulation and comprehensive research of accumulation combination, the key conditions and fields selection of gas accumulation at 10000 meters deep depth are analyzed.The results show that large fault-anticlines, anticlines and fault-block structures, which are controlled by coal measure strata, giant thick mudstone and Paleozoic unconformity double detachment strata, are developed in the 10000 meter deep area of Kuqa Depression, and the Kelasu thrust belt is the most concentrated.Huge thick Triassic-Lower Jurassic high-over-mature coal measures and lacustrine mudstone source rocks are developed in the depth area of 10000 meters, with hydrocarbon generation capacity of （1000~3000）×10⁸m³/km². Under the large-area distribution of braided river delta plain-front giant thick sand body and late rapid deep burial, ultra-high temperature and ultra-high pressure strong structural compressive stress, the large-scale development of fracture-porosity reservoir still has 5%~10% porosity and more than 1mD permeability at the depth of 10000 meters.The 10000-meter deep area is mainly regional reservoir-cap combination in the Triassic-Lower Jurassic near/within the source, which is dominated by structure-lithologic gas reservoirs and tight sandstone gas reservoirs. The strategic exploration area of the preferred Kelasu thrust belt is 4200km², and the natural gas resources are up to 1.5×10⁸m³ and the trap under Keshen gas field is a favorable target area.The research results will provide the basic understanding for the exploration of natural gas in the field of clastic rock in the depth of 10000 meters in China, and lay the geological theoretical foundation for further exploration of large gas fields under the Kela and Keshen reservoirs in the thrust belt of Kuqa foreland basin.

Key words: 10000 meters deep gas, Reservoir conditions, Favorable belt, Kuqa Depression；Tarim Basin

CLC Number:

TE121

Zhang Ronghu, Jin Wudi, Zeng Qinglu, Yang Xianzhang, Yu Chaofeng, Song Bing, Wang Ke, Li Dong. Analysis of the key conditions for gas accumulation and favorable belt in 10000 meters deep clastic rock: a case study of the Mesozoic Kuqa foreland thrust belt[J]. China Petroleum Exploration, 2025, 30(3): 47-61.

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