摘要
通过对东海丽水—椒江凹陷的构造、沉积地层和成藏要素的分析,系统阐述了其成藏条件。结果表明:丽水—椒江凹陷古新世主断陷期分为4幕断陷,其中初始断陷Ⅰ幕以湖相沉积环境为主,之后过渡为海相沉积环境,该凹陷存在3组烃源岩及3套储盖组合,其中下古新统月桂峰组湖相暗色泥岩有机质丰度高,且其类型以Ⅱ型为主,生烃潜力良好,为该区主力烃源岩;古新统储集层以砂岩为主,其中灵峰组和月桂峰组砂岩为Ⅲ—Ⅳ类储层,明月峰组砂岩为Ⅲa—Ⅱb类储层,物性受凹陷内顶封型异常高压系统改造优化。断陷早期的(扇)三角洲、滨湖、滨海砂体和上灵峰组上部及明月峰组下部的浅海泥构成的下储盖组合靠近主力烃源岩层,且异常高压系统增储滞排,因此储盖配置条件良好,勘探前景佳。预测凹陷内洼槽带生烃中心上方、灵峰潜山两侧及丽西次凹西斜坡的优势成藏构造带是研究区内有利的远景勘探区带,并识别划分出三大类共11个有利构造带。
Jiyuan area is one of the key oil and gas exploration area within the basin.Based on the research of source rocks,reservoir rocks,hydrocarbon migration and traps,this paper synthetically analyzed the hydrocarbon accumulation conditions of Chang 2 oil reservoir set in Jiyuan area.The result shows that hydrocarbon of Chang 2 oil reservoir mainly comes from Chang 7 source rocks.The reservoir in the study area is mostly underwater distributary channel sand bodies,and sandstone is mainly composed of arknse,lithic arkose,with little feldspathie lithic sandstone,so it belongs to moderate porosity and low permeability reservoir.Compaction,cementation and dissolution are the main diagenesis lypes.The abnormal high pressure from Chang 7 oil reservoir set drives the nil generated from Chang 7 source rocks up to Chang 2 oil reservoir set.The oil in Chang 2 oil reservoir set is mainly Irapped by structural-lithologic trap,with local area by structural trap and lilhologic trap.The thick interdistribulary mudstone developed in Chang 2 oil reserw,ir set plays the necessary role as the shieht and cap rock of Chang 2 oil reservoir set.
作者
田兵
庞国印
王琪
唐俊
廖朋
TIAN Bing;PANG Guoyin;WANG Qi;TANG Jun;LIAO Peng(Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;Graduate School of Chinese Academy of Sciences,Beijing 100049,China;School of Mathematics,Physies and Biological Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《岩性油气藏》
CSCD
2012年第5期32-37,42,共7页
Lithologic Reservoirs
基金
国家科技重大专项"海洋深水区油气勘探关键技术"(编号:2008ZX05000-025)资助
关键词
油气成藏条件
叠合断陷盆地
勘探方向
丽水—椒江凹陷
hydrocarbon accumulation condition
Yanchang Formation
Chang 2 oil reservoir set
Jiyuan area
Ordos Basin
