渤海湾盆地济阳坳陷埕岛—桩西潜山油气特征与来源  

Characteristics and source of oils and gases in Chengdao-Zhuangxi buried-hill,Jiyang Depression,Bohai Bay Basin

作　　者：郭志扬 刘华[1,2] 程斌[1,2] 杨贵丽[3] 徐昊清 张芷晴[1,2] GUO Zhi-yang;LIU Hua;CHENG Bin;YANG Gui-li;XU Hao-qing;ZHANG Zhi-qing(Key Laboratory of Deep Oil and Gas,China University of Petroleum,Qingdao 266580,China;School of Geosciences,China University of Petroleum,Qingdao 266580,China;Research Institute of Petroleum Exploration and Development,SINOPEC Shengli Oilfield Company,Dongying 257015,China)

机构地区：[1]中国石油大学(华东)深层油气重点实验室,山东青岛266580 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《天然气地球科学》2020年第10期1437-1452,共16页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:41821002);国家科技重大专项“渤海湾盆地油气分布有序性成因模式因研究”(编号:2016ZX05006-003);中央高校基本科研业务费专项资金(编号:18CX05019A)联合资助.

摘　　要：潜山油气藏具有多种油气来源和充注成藏方式。为揭示渤海湾盆地济阳坳陷潜山油气藏的形成过程,以油气物性、地球化学特征为基础,分析了埕岛—桩西潜山带的油气来源及充注方式。结果表明:研究区原油来自低等生物为主的湖相烃源岩,天然气为腐泥型干酪根在热解生烃过程中产生的原油伴生气;受多源供烃的影响,油气物性和地球化学特征在不同层系之间无明显差异,但在不同构造带间差异显著。埕北11潜山原油中4⁃甲基甾烷不发育,是埕北凹陷沙三段烃源岩生成的油气沿埕北断层垂向注入而形成;埕北20潜山的原油成熟度相对较低、伽马蜡烷含量高低不等,为来自沙南凹陷沙一段和沙三段的混源油,通过不整合侧向充注而聚集;埕北30潜山和桩海潜山的原油成熟度高,是黄河口凹陷沙三段烃源岩生成的油气沿埕北30断层和供烃窗口充注而形成;桩西潜山的油气来自孤北洼陷沙三段,经桩南断层从供烃窗口充注进入潜山。To reveal the formation process of buried-hill reservoirs in Jiyang Depression of Bohai Bay Basin,the hydrocarbon source and charging mode were analyzed based on the physical properties and geochemical charac⁃teristics of oil and gas samples in Chengdao-Zhuangxi buried-hill belt.The oils in study area are from lake facies source rock with aquatic organisms,and the gas is oil-associated gas from sapropelic kerogen.Under the influ⁃ence of multi-source supply,physical properties and geochemical characteristics of oils and gas show significant difference between structural belts but no obvious difference between layers.The 4-methyl sterane is not devel⁃oped in the oils of Chengbei 11 buried-hill,reflecting that the oils and gases are from Es3 source rock of Cheng⁃bei Sag and charge along Chengbei fault.The oil maturity is relatively low in Chengbei 20 buried-hill with vari⁃able content of gammacerane,reflecting the mixed source of Es1 and Es3 in Shanan Sag and accumulate laterally by unconformity.The oil maturity is high in Chengbei 30 buried-hill and Zhuanghai buried-hill,which are from Es3 source rock of Huanghekou Sag and charge along Chengbei 30 fault and hydrocarbon supply window.The oils and gases of Zhuangxi buried-hill are from Es3 source rock of Gubei Subsag and charge through hydrocarbon supply window.

关 键 词：潜山油气藏 油气物性 地球化学特征 油气来源 油气充注 

分 类 号：TE122.23[石油与天然气工程—油气勘探]