四川盆地东南部二叠系长兴组成藏过程与天然气有效聚集

陈强路; 席斌斌; 尤东华; 蒋宏; 刘显

doi:10.11781/sysydz2025050963

四川盆地东南部二叠系长兴组成藏过程与天然气有效聚集

doi: 10.11781/sysydz2025050963

陈强路^1,2,
席斌斌^1,2,
尤东华^1,2,
蒋宏^1,2,
刘显^1,2

1. 中国石化油气成藏重点实验室, 江苏无锡 214126;
2. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家自然科学基金企业创新发展联合基金集成项目(U24B6001)和中国石化科技部项目(P24167)联合资助。

详细信息

作者简介:
陈强路(1969—)，男，博士，高级工程师，从事沉积储层与成藏研究。E-mail:chenql.syky@sinopec.com。

中图分类号: TE122.12
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出版历程
- 收稿日期: 2024-10-11
- 修回日期: 2025-08-05
- 刊出日期: 2025-09-28

Hydrocarbon accumulation process, and effective natural gas accumulation in Permian Changxing Formation, southeastern Sichuan Basin

1. SINOPEC Key Laboratory of Hydrocarbon Accumulation Mechanisms, Wuxi, Jiangsu 214126, China;
2. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 四川盆地东南部二叠系长兴组天然气聚集成藏规律复杂，为此，基于热演化史恢复、岩石薄片、矿物同位素、流体包裹体等分析手段，研究了该区烃源岩热演化供烃过程、储层成岩作用和孔隙演化、古油藏热裂解记录，揭示了长兴组天然气藏成藏演化过程。研究表明，该区长兴组颗粒滩相和生物礁相以及白云岩化控制了优质储层的发育；中—晚侏罗世原油充注形成古油藏，晚侏罗世—早白垩世古油藏发生相态转化，原油原位热裂解并发生一定的硫酸盐还原作用，古油藏相态转化成为高温高压气藏；喜马拉雅期川东南地区强烈的挤压变形过程中，古气藏发生位置调整，弱构造变形区良好的保存条件是气藏持续保存的关键，储层孔隙中赋存干沥青和干气，而强变形区保存条件变差，气藏中的天然气发生泄漏，储层孔隙中除油藏裂解产生的干沥青外，还发育晚期方解石胶结，使储层发生致密化。因此，四川盆地东南部地区二叠系长兴组优质储层和气藏保存条件是天然气规模有效聚集的关键。
- 成岩作用 /
- 孔隙演化 /
- 天然气成藏 /
- 长兴组 /
- 二叠系 /
- 四川盆地
Abstract: The Permian Changxing Formation in the southeastern Sichuan Basin has complex natural gas accumulation patterns. Using analysis methods such as thermal evolution history reconstruction, rock thin sections, mineral isotopes, and fluid inclusions, this study investigated the hydrocarbon generation process of source rocks, reservoir diagenesis and pore evolution, and thermal cracking records of paleo-oil reservoirs, thereby revealing the evolution process of natural gas accumulation in the Changxing Formation. The study showed that the development of high-quality reservoirs was controlled by grain shoal facies, reef facies, and dolomitization. During the Middle and Late Jurassic, crude oil charging formed paleo-oil reservoirs, which subsequently underwent phase transformation in the Late Jurassic to Early Cretaceous. This process involved in-situ thermal cracking of crude oil accompanied by partial sulfate reduction, transforming the paleo-oil reservoirs into high-temperature, high-pressure gas reservoirs. During the Himalayan orogeny, the intense compressional deformation in southeastern Sichuan caused positional readjustment of paleo-gas reservoirs. The favorable preservation conditions in weak structural deformation zones proved critical for the sustained preservation of these gas reservoirs. The reservoir pores contained pyrobitumen and dry gas, while the strong deformation zones exhibited poorer preservation conditions, leading to natural gas leakage. In addition to the pyrobitumen formed by oil cracking, the reservoir pores also developed late-stage calcite cementation, resulting in reservoir densification. Therefore, the preservation conditions of high-quality reservoirs and gas accumulations in the Permian Changxing Formation are crucial for the effective large-scale accumulation of natural gas in the southeastern Sichuan Basin.
- diagenesis /
- pore evolution /
- natural gas accumulation /
- Changxing Formation /
- Permian /
- Sichuan Basin

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