摘要
综合录井、测井、地震、取心及分析化验资料,从烃源岩与油源条件、储盖组合特征、圈闭发育特征、油气运移及保存条件5个方面对辽中凹陷南洼旅大21油田的油气成藏条件进行系统剖析。研究结果表明,旅大21油田的原油主要来自沙三段烃源岩,且混入部分沙一段烃源岩的原油;储层以馆陶组辫状河碎屑岩为主,生储盖组合为下生中储上盖式;圈闭类型受控于中央走滑断层,西盘为半背斜构造,东盘为复杂断块构造;长期继承性发育的断层在新构造运动时期的活化为旅大21油田创造了良好的油气运移条件,不同断块控圈断层的封堵能力具有差异性。油气藏平面上主要分布于走滑反转作用形成的西盘半背斜构造及东盘似花状构造,纵向上油气主要富集于馆陶组区域泥岩盖层下伏的馆陶组Ⅳ和Ⅴ油组,且具有单井揭示油层厚度大、连续含油井段长、油层分布集中的特点,走滑反转-区域盖层-断层侧封三元耦合对旅大21油田平面和垂向上的油气聚集具有控制作用。
The hydrocarbon accumulation conditions in LD21Oilfield were analyzed,using mud logging,well logging,cor-ing and core analysis test data from five aspects,including the source rocks and oil source conditions,reservoir-seal assem-blage,trap characteristics,oil and gas migration and preservation condition.The results show that the crude oil in LD21Oil-field are mainly from the source rocks of the third member of Shahejie Formation and part of them from the source rocks of the first member of Shahejie Formation.The main reservoirs are the clastic rocks deposited in the braided river in the Guan-tao Formation.The style of source-reservoir-seal assemblage is source at the bottom,reservoir at the middle and seal at the top.Being controlled by central strike-slip fault,the trap in the west plate is a semi-anticline structure,and in the east plate is a complex fault block structure.The long activation of the inherited faults in the Neotectonic movement creates good conditions for oil and gas migration in LD21Oilfield.The sealing capacity of faults in the fault-controlled traps of dif-ferent fault blocks is different.The oil and gas reservoirs are mainly distributed in the semi-anticline structure of west plate and the flower-like structure of east plate,which is formed under the influence of strike-slip reversal in plane.In the longi-tudinal direction,the oil and gas are mainly concentrated in theⅣandⅤoil groups under the mudstone cap rock of the Guantao Formation,and the oil reservoirs discovered by single well are characterized by large thickness,long length oilbearing-sections and concentrated distribution of oil layers.Finally,the oil and gas accumulation of the LD21Oilfield in the plane and vertical is controlled by the coupling of three elements,which are strike-slip reversal,regional cap and later-al sealing of fault.
作者
李强
田晓平
张婕茹
王少鹏
杨宏飞
LI Qiang;TIAN Xiaoping;ZHANG Jieru;WANG Shaopeng;YANG Hongfei(Bohai Oilfield Research Institute,Tianjin Branch Company,CNOOC China Ltd.,Tianjin City,300459,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2018年第3期11-19,共9页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"渤海海域勘探新领域及关键技术研究"(2016ZX05024-003)
关键词
油气成藏条件
油气分布特征
走滑反转
区域盖层
断层侧封
hydrocarbon accumulation conditions
hydrocarbon distribution characteristics
strike-slip reversal
regional cap
lateral sealing of fault
