鄂尔多斯盆地3条油藏大剖面对风险勘探的意义  

Significance of three reservoir profiles for the risk exploration in Ordos Basin

作　　者：赵振宇[1] 郭彦如[1] 徐旺林[1] 张延玲[1] 高建荣[1] 张月巧[1,2] 

机构地区：[1]中国石油勘探开发研究院 [2]中国地质大学(北京)

出　　处：《石油勘探与开发》2011年第1期16-22,共7页Petroleum Exploration and Development

基　　金：国家大型油气田与煤层气开发项目(2008ZX05001-004;2008ZX05004-001);中国石油天然气股份有限公司"岩性地层油气藏富集规律与勘探技术研究"重大专项(2008B-0103);中国石油天然气股份有限公司"海相碳酸盐岩大油气田勘探开发关键技术"重大专项(2008E-0706);中国石油科技创新基金资助(2010D-5006-0104)

摘　　要：鄂尔多斯盆地大致经历了6个演化阶段,主要发育3套烃源岩、2条不整合面及多套储盖组合,形成以下古生界奥陶系气藏、上古生界石炭-二叠系气藏、中生界三叠系—侏罗系油藏为代表的3大含油气系统。深入分析盆地内部3条油气藏连井剖面(吴忠—米脂;固原—宜川;包头—澄城)可知:烃源岩控制油气藏的规模与展布;中生界油藏位于生烃坳陷内部或附近,油气二次运移距离相对较短;古生界天然气可在整个盆地烃源岩范围内短距离运移,且规模较大,最终聚集于奥陶系顶面风化壳有效岩溶圈闭和石炭-二叠系源内或近源低渗透有效砂岩圈闭中。盆地未来风险勘探领域为:①中生界石油勘探以向北扩展和探寻生油层系内部非常规油藏为主;②上古生界天然气勘探以向盆地南部扩展和开发海相碎屑岩气藏为主;③下古生界天然气勘探以寻找伊陕斜坡中北部、盆地东南部风化壳和台缘礁滩体岩性-构造圈闭气藏为主。The Ordos Basin went through six main stages of geological evolution,developed three sets of soure rocks,two unconformities,several sets of reservoirs and caprocks,and had three typical petroleum systems,i.e.Lower Paleozoic Ordovician gas reservoirs,Upper Paleozoic Carboniferous-Permian gas reservoirs,and Mesozoic Triassic-Jurassic oil reservoirs.Three well profiles of oil and gas reservoirs in the basin are analyzed,which are the Wuzhong-Mizhi profile,Guyuan-Yichuan profile,and Baotou-Chengcheng profile.The size and distribution of the oil and gas reservoirs are controlled by the spatial distribution of soure rocks.Mesozoic oil reservoirs are located inside or near hydrocarbon depressions,where oil and gas had a short secondary migration distance.Paleozoic gas in the basin,after having a large-scale short migration in the range of source rocks,eventually gathered in the effective traps of the Ordovician weathering crust,and in the low permeability effective sand traps inside or near Carboniferous-Permian source rocks.The future risk exploration targets are：（1） for Mesozoic oil exploration,it will extend northward and explore unconventional reservoirs in source rocks;（2） for Upper Paleozoic gas exploration,it will extend southward and explore marine clastic gas reserviors;（3） for Lower Paleozoic gas exploration,it will search for lithologic-structural traps of carbonate weathering crust in the north-central and southeastern Yishan slope and those of carbonate reef flat.

关 键 词：鄂尔多斯盆地 油气藏剖面 含油气系统 风险勘探 

分 类 号：TE122.1[石油与天然气工程—油气勘探]