酒西坳陷青西凹陷富油的地质—地球化学因素分析  

Controls on the Enrichment of Oil Pools in Qingxi Sag,Jiuxi Basin

作　　者：杨智明[1] 王琪[2] 史基安[2] 李曼茹 王雷[2] 

机构地区：[1]中国石油天然气总公司玉门油田分公司勘探开发研究院,甘肃玉门735200 [2]中国科学院兰州地质研究所气体地球化学国家重点实验室,兰州730000

出　　处：《沉积学报》2003年第4期695-701,共7页Acta Sedimentologica Sinica

基　　金：气体地球化学国家重点实验室基金(SJJ 0 3 0 4 );中国科学院"西部之光"人才培养计划项目资助

摘　　要：青西凹陷下白垩统暗色半深湖相—深湖相的泥岩、白云质泥岩和泥质白云岩为研究区主力烃源岩 ,其沉积时为整体上处于封闭—半封闭强还原—还原环境的断陷湖泊 ,有利于有机质的保存和转化 ,且烃源岩厚度占地层比例均大于 5 0 %以上 ,加之有机质类型以混合型为主、有机碳含量普遍大于 1% ,为油田形成提供了重要的物质基础。喜山期构造运动形成了许多挤压逆断层、剪切性断层和构造缝 ,造成地层和构造叠覆 ,为有机质成熟、运移和聚集提供了动力和空间 。A series of Cretaceous lacustrine mudstone, shale, dolomitic mudstone and argillaceous dolostone comprises the main source rocks of Qingxi Sag in the study area. During deposition, the Qingxi Sag was a closed to semi closed rift basin with strong reducing conditions that was favorable for the preservation and transformation of organic matter. In addition, the thickness of the source rock is very great with the ratio of source rock to strata over 50%, together with mixing organic types, high content of organic carbon (>1%), which all provided the important material basis for oil pool formation. Himalayan tectonic movement formed lots of compressional reverse faults, shears faults and structural fissures, and resulted in strata and structure overstacking to provide impetus and space for organic matter maturity, migration and accumulation of petroleum.

关 键 词：酒西坳陷 青西凹陷 油藏富集 地质-地球化学因素 

分 类 号：P618.130.2[天文地球—矿床学] TE122[天文地球—地质学]