川西坳陷东坡沙溪庙组气藏成藏演化模式  

Evolution Model for the Gas Reservoirs in the Shaximiao Formation,Eastern Slope of the Western Sichuan Depression

作　　者：徐敏[1,2,3] 刘建[1,2,3] 林小云 熊山[4] 牛斌莉[4] XU Min;LIU Jian;LIN Xiaoyun;XIONG Shan;NIU Bin(Hubei Collaborative Innovation Center for Unconventional Oil/Gas,Yangtze University,Wuhan,Hubei430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education,Yangtze University,Wuhan,Hubei430100,China;College of Geosciences,Yangtze University,Wuhan,Hubei430100,China;The First Exploitation Factory of Oil Production,Changqing Oilfield Company of CNPC,Yanan,Shaanxi716000,China)

机构地区：[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

出　　处：《现代地质》2018年第5期953-962,共10页Geoscience

基　　金：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)

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。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.

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 

分 类 号：TE122[石油与天然气工程—油气勘探]