四川盆地川西坳陷三叠系盐下超深层油气成藏条件与勘探方向

doi:10.11743/ogg20230617

Abstract

Abstract:

The Triassic subsalt marine sequences in the western Sichuan Depression， with burial depths generally exceeding 7 000 m， have been subjected to limited oil and gas exploration. Nonetheless， these sequences boast superior conditions for hydrocarbon accumulation， showing great exploration potential. Based on the latest drilling and seismic data， we conduct a comprehensive analysis of the ultra-deep source rocks， reservoirs， and structural deformation styles， as well as their effect on dynamic hydrocarbon accumulation in the western Sichuan Depression. Accordingly， we delineate favorable exploration targets in the depression. The key findings of this study are as follows：（1） Three suites of regional source rocks， namely the Lower Cambrian Qiongzhusi Formation， the Middle Permian Maokou Formation and the Upper Permian Longtan Formation， are developed in the ultra-deep layers of the western Sichuan Depression. Three suites exhibit hydrocarbon-generating intensities exceeding 2.0×10⁹ m³/km²， enabling the western Sichuan Depression to have the resource potential to form large- or medium-sized oil and gas fields；（2） The depression hosts the platform-margin mound shoals of the Sinian Dengying Formation and the grain shoal dolomite reservoirs of the Permian Qixia and Maokou formations， which are influenced by high-energy facies tracts and multi-stage karstification. All these lay the foundation for the formation of large-scale reservoirs；（3） Subsalt， parautochthonous anticline structures are developed in the footwall of nappes in the piedmont zone. Meanwhile， highly-steep faults and strike-slip transpressional structures are found in the piedmont depressed zone. All these structures act as favorable traps for hydrocarbon accumulation；（4） The piedmont buried structures and the tectono-lithologic composite traps within the depression were both formed during the Indosinian， matching well with the main hydrocarbon-generating period of the Cambrian source rocks and the basement fault activity， suggesting favorable conditions for early hydrocarbon accumulation. As revealed by a comprehensive assessment， favorable targets for future oil and gas exploration in the western Sichuan Depression include the platform-margin zone of the Sinian Dengying Formation and the Permian high-energy facies tracts connected to highly-steep basement faults in the depression， as well as the autochthonous structures in the footwall of nappes in the piedmont zone.

Key words: Qiongzhusi Formation, Longtan Formation, Dengying Formation, Qixia Formation, Maokou Formation, subsalt deep sequence, accumulation condition, western Sichuan Depression, Sichuan Basin

CLC Number:

TE122.3

Shuangjian LI, Zhi LI, Lei ZHANG, Yingqiang LI, Xianwu MENG, Haijun WANG. Hydrocarbon accumulation conditions and exploration targets of the Triassic subsalt ultra-deep sequences in the western Sichuan Depression， Sichuan Basin[J]. Oil & Gas Geology, 2023, 44(6): 1555-1567.

Figures/Tables 11

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层位	沉积环境	岩性	厚度/m	TOC/%	R_o/%	有机质类型	生烃强度/（10⁸m³/km²）
筇竹寺组	陆棚相	泥页岩	200～350	0.5～4.0	2.50～5.00	Ⅰ型	60～140
茅口组	缓坡相	泥岩、石灰岩、泥灰岩	>50	0.6～2.0	2.00～4.75	Ⅰ-Ⅱ型	5～10
龙潭组	斜坡-陆棚相	泥岩	50～150	0.6～3.5	2.00～4.20	Ⅱ₁型	15～20

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Hydrocarbon accumulation conditions and exploration targets of the Triassic subsalt ultra-deep sequences in the western Sichuan Depression， Sichuan Basin

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