松辽盆地长岭凹陷深层气田成藏差异性及其成因  

Study on reservoir forming difference and causes of deep gas field in Changling depression,Songliao basin

作　　者：肖永军[1,2] 徐春华[3] 湛小红[4] 邱连贵[2] 

机构地区：[1]北京大学石油与天然气研究中心,北京100871 [2]中国石化股份胜利油田分公司西部新区研究中心,山东东营257015 [3]中国石化股份胜利油田分公司勘探项目管理部,山东东营257001 [4]西南石油大学资源与环境学院,四川成都610500

出　　处：《油气地质与采收率》2012年第3期29-33,112-113,共5页Petroleum Geology and Recovery Efficiency

基　　金：中国石化股份科技攻关项目"长岭断陷火山岩气藏成藏主控因素及区带优选"(P10024)

摘　　要：近年来松辽盆地南部长岭凹陷断陷层的勘探取得了较大进展,发现了腰英台深层气田、东岭油气田和达尔罕、达北、东英台、前神字井等含气构造。不同地区天然气组分含量存在明显差异,烃类及非烃类气体组分含量与距深大断裂的距离密切相关。通过天然气碳同位素研究发现,形成气藏的气源包括断陷层有机烃类气体和幔源无机二氧化碳或氮气,并且有机成因气的成熟度在不同地区的差异较大。在分析了不同油气田(含气构造)气体组分和碳同位素组成等差异性的基础上,从成藏期和输导体系2个方面探讨了造成气藏差异性的主要原因,指出不同地区烃源岩演化的阶段性决定了不同气藏中天然气成熟度的差异,输导体系的不同决定了不同油气田(含气构造)气体组分的差异。Yaoyingtai deep gas field,Changling oil and gas field,Daerhan and Dabei gas reservoirs have been discovered in faulted layer of Songnan Changling depression,but there are obvious differences of gas compositions contents among each gas field. By studying on the gas carbon isotope,it was found that the gas source formed reservoir includes two kinds:organic hydrocarbon gas and inorganic mantle-derived CO_2,also the maturities of organic hydrocarbon gas are different.On the basis of analysis on the difference of gas compositions,carbon isotope composition of different gas reservoirs,two aspects reservoir-forming stages and transport system are discussed for the reason of this difference.It is pointed out that the different reservoir-forming stages determined the difference of gas maturities and the different transport system determined the difference of gas compositions.

关 键 词：气体组分 碳同位素 差异性 成藏期次 输导体系 长岭凹陷 

分 类 号：TE112.11[石油与天然气工程—油气勘探]