摘要
库车前陆盆地是中国目前油气勘探程度和研究程度最高的前陆盆地。在深入认识库车前陆盆地油气成藏条件和油气聚集过程的基础上,总结了库车前陆盆地的油气分布规律:1平面上,油气相态在克拉苏构造带中部以干气为主,以此为中心向南、北两侧及东、西两端渐变为凝析气、油藏;2垂向上,以第三系含盐地层和侏罗系煤系泥岩2套区域盖层划分为盐上、盐下和深层3套成藏组合,盐下白垩系成藏组合是天然气勘探主体;3从南向北,不同构造带的油气藏类型、油气相态、油气成藏期次表现为时空上的有序聚集;4从东向西,不同构造段构造特征、油气藏类型、成藏特征和资源潜力具有差异性,具有中段油气富集的特征。通过对油气成藏规律和油气分布特征的认识,整体建立了库车前陆盆地从非常规致密油气到常规油气的有序聚集模式,深入认识了油气分布规律和有利勘探领域。
At present,Kuqa foreland basin has the highest degree of prospecting and attracts the most attention from researchers in China.Based on the deep understanding of accumulation condition and process,the oil and gas distribution law was systematically analyzed and summarized：（1） Horizontally,dry gas mainly exists in the central segment of Kelasu tectonic belt,while condensate gas and oil reservoirs gradually appear from this center to the north and south sides,and to the east and west ends;（2） Vertically,taking the tertiary salt-bearing strata and mudstone in Jurassic coal measures as two sets of regional cap rocks,it can be divided into three sets of reservoir-forming combinations,i.e.,the supra-salt,sub-salt,and deep layer combination.Among them,Cretaceous combination under the salt-bearing strata is the main exploration domain for natural gas;（3） From south to north,the reservoir type,hydrocarbon phase state,accumulation time in different tectonic belts are shown as ordered time-space aggregation;（4） From east to west,there are certain differences in tectonic characteristics,reservoir types,hydrocarbon accumulation characteristics and resource potential between various segments,and rich hydrocarbon is found in the middle segment.Based on the analysis of hydrocarbon accumulation law and distribution characteristics,an integrated orderly accumulation model is established for both conventional petroleum and unconventional tight oil and gas in Kuqa foreland basin,which is useful to further recognize the hydrocarbon distribution law and favorable exploration domains.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2015年第4期395-404,共10页
Acta Petrolei Sinica
基金
国家重大科技专项(2011ZX05003)
中国石油天然气集团公司科技开发项目(2011-B0403)资助
关键词
成藏条件
成藏过程
分布规律
成藏组合
有序聚集
库车前陆盆地
accumulation condition
accumulation process
distribution law
reservoir-forming combination
orderly accumulation
Kuqa foreland basin
