西湖凹陷Y构造花港组气藏特征及成藏主控因素  

Characteristics of gas reservoir and controlling factors for gas accumulation in the Huagang Formation in Y Structure,Xihu Sag

作　　者：刘峰[1] 黄苏卫 杨鹏程[1] 张传运 LIU Feng;HUANG Suwei;YANG Pengcheng;ZHANG Chuanyun(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院,上海200120

出　　处：《海洋地质与第四纪地质》2021年第6期174-182,共9页Marine Geology & Quaternary Geology

基　　金：中国石油化工股份有限公司科技项目“西湖凹陷斜坡带油气成藏条件及目标评价”(KJ-2019-11)。

摘　　要：以常规和非常规油气成藏理论为指导,结合储层、流体等测试分析结果,开展西湖凹陷Y构造花港组气藏特征及成藏主控因素研究。结果表明:①花港组垂向上符合中下部致密砂岩气、上部常规天然气藏的分布序列;②常规气藏气水关系正常,受断盖配置对沿断裂运移油气的封闭作用和断层侧向封堵能力影响,油气主要在区域盖层之下的断背斜顶部富集;③致密气藏具叠覆跨越源储组合关系,含气饱和度低,无明显气水界面,属先致密后成藏类型,不同部位含气性受构造幅度和储层物性共同控制。本次研究丰富和完善了西湖凹陷常规-非常规天然气序列成藏规律,并为致密砂岩气的勘探提供理论指导。Following both the conventional and unconventional oil and gas accumulation theories,and upon the basis of the experimental and testing results of the reservoirs and fluids,this paper studied the characteristics of gas reservoirs and the controlling factors on hydrocarbon accumulation in the Huagang Formation in the Y structure of Xihu Sag.And the following research results are obtained.①there is a vertical distribution pattern of gas accumulation from the middle and lower tight sand gas to upper conventional reservoir gas in the Huagang Formation of the study area.②Influenced by the sealing of matched fault and cap rock system to oil-gas migration through faults and by lateral migration,the conventional gas reservoirs with a normal gas-water contact are formed and distributed at the top of fault-anticline traps below the regional caprock.③The tight sand reservoirs are characterized by separated source-reservoir system,low gas saturation,complex gas-water relationship,and antecedent tight sand reservoir.Reservoirs which have different porosity and located in different structural heights have different gas saturation.The result has an important significance for the study of the accumulation models of the conventional and unconventional gas reservoirs in the Xihu Sag and will provide a guidance for exploration of the tight sand gas.

关 键 词：致密砂岩气藏 主控因素 西湖凹陷 花港组 

分 类 号：P612[天文地球—矿床学]