| 川西坳陷东坡沙溪庙组气藏成藏演化模式 |
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| 引用本文： | 徐敏,刘建,林小云,熊山,牛斌莉.川西坳陷东坡沙溪庙组气藏成藏演化模式[J].现代地质,2018,32(5):953. |
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| 作者姓名： | 徐敏 刘建 林小云 熊山 牛斌莉 |
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| 作者单位： | (1非常规油气湖北省协同创新中心 长江大学，湖北 武汉430100；2油气资源与勘探技术教育部重点实验室 长江大学，
湖北 武汉430100；3长江大学 地球科学学院，湖北 武汉430100；4中石油长庆油田分公司 第一采油厂，陕西 延安716000) |
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| 基金项目： | 国家科技重大专项“海相碳酸盐岩油气资源潜力与大油气田形成条件、分布规律研究”(2011ZX05004-001)。 |
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| 摘 要： | 川西坳陷东坡气藏主力产层为沙溪庙组，其圈闭类型以构造-岩性圈闭为主，多为致密砂岩储层，但断层发育，有效改善了储层物性，断砂匹配样式与构造演化对油气成藏过程有重要影响。基于前人已有的认识，通过沙溪庙组气藏成藏动力演化、气水分布特征及生烃期次分析，结合构造演化、成藏幕次等研究，认为沙溪庙组天然气成藏受构造古隆起、断砂配置、储层物性、构造演化影响，形成了“构造控向、断砂控运、储层控藏、演化控调”的成藏演化模式，同中存异，高庙子地区古构造的控制作用更为明显，而中江地区岩性控制作用占主导。沙溪庙组气藏间歇性充注具“燕山期三幕成藏，喜山期调整改造”的成藏特征，多期构造演化和较强的储层非均质性影响了含气饱和度，导致沙溪庙组气藏分布、气藏产能差异大。
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| 关 键 词： | 成藏演化模式 成藏动力 幕式成藏 气藏 沙溪庙组 川西坳陷 |
Evolution Model for the Gas Reservoirs in the Shaximiao Formation,Eastern Slope of the Western Sichuan Depression |
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| XU Min,LIU Jian,LIN Xiaoyun,XIONG Shan,NIU Binli.Evolution Model for the Gas Reservoirs in the Shaximiao Formation,Eastern Slope of the Western Sichuan Depression[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(5):953. |
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| Authors: | XU Min LIU Jian LIN Xiaoyun XIONG Shan NIU Binli |
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| Institution: | (1Hubei Collaborative Innovation Center for Unconventional Oil/Gas，Yangtze University，Wuhan，Hubei430100，China；
2Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education，Yangtze University，Wuhan，
Hubei430100，China；3College of Geosciences，Yangtze University，Wuhan，Hubei430100，China；
4The First Exploitation Factory of Oil Production，Changqing Oilfield Company of CNPC，Yanan，Shaanxi716000，China) |
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| Abstract: | The Shaximiao Formation is the main gas producing sequence in the eastern slope of the Western Sichuan Depression, and its trap type is dominantly tectonic lithologic trap.Most of the gas reservoirs are composed of tight sandstones with well developed faults and fractures, which effectively improved the physical properties of reservoirs. The coupling patterns of fault and sandstone and their tectonic evolution are of great importance to the hydrocarbon accumulation.Our analyses on the dynamic evolution,gas water distribution characteristics and hydrocarbon formation sequence of the gas reservoirs in the Shaximiao Formation (and the integration with regional tectonic evolution and hydrocarbon accumulation periods) concluded that gas accumulation in the Shaximiao Formation was influenced by tectonic uplifts, fault sandstone configurations,physical properties of reservoir and tectonic evolution.This formed the reservoiring evolution patterns that are of tectonic orientation controlled, fault reservoir migrating controlled,reservoir accumulation controlled and evolution modification controlled.The control of paleostructures in the Gaomiaozi region is more pronounced, while the Zhongjiang region is dominated by lithologic control.Gas reservoirs in the Shaximiao Formation are featured by the three Yanshanian episodic reservoiring, and the subsequent Himalayan modification.The multi phase tectonic evolution and strong reservoir heterogeneity have influenced the gas saturation,leading to the widely different gas distributions and reservoir productivity in the Shaximiao Formation. |
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| Keywords: | gas reservoir evolution model accumulation dynamics episodic reservoiring gas reservoir Shaximiao Formation Western Sichuan Depression |
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