摘要
在系统分析海拉尔盆地贝尔凹陷断裂系统及其演化的基础上,研究了断裂演化对油气运聚条件的控制作用。研究表明,贝尔凹陷发育的断裂主要有4种类型:早期伸展断裂、中期张扭断裂、早期伸展中期张扭长期活动断裂和早期伸展中期张扭晚期反转长期活动断裂。可划分出3套断裂系统:早期伸展断裂系统、中期张扭断裂系统和晚期反转断裂系统。断裂的活动主要有3期:铜钵庙组—南屯组末期在NW—SE向引张应力场作用下发生伸展变形形成早期伸展断裂系统;伊敏组二、三段沉积时期在近EW向拉张应力场作用下发生纯剪切变形形成中期张扭断裂系统;伊敏组末期—青元岗组沉积在近EW向弱挤压应力场作用下发生收缩变形形成晚期反转断裂系统。断裂的形成演化控制圈闭的形成时期、发育类型及展布方位。长期活动的断裂是贝尔凹陷主要的油源断层类型,围绕富烃洼陷发育受油源断层控制的基底断块圈闭和断陷构造层的掀斜断块圈闭及正牵引断块圈闭是油气运聚成藏的有利目标区。
Based on systematic analysis of fault systems and its evolution in the Beier Sag,Hailaer Basin,the control of fault formation and evolution on hydrocarbon migration and accumulation was researched. It is concluded that there were four types faults which were early extensional faults,middle tensional—shear faults,early extensional middle tensional—shear long-term active faults and early extensional middle tensional—shear late inverse long-term active faults,and three fault systems which were early extensional fault systems,middle tensional—shear fault systems and late inverse fault systems. There were three fault active periods in the Beier Sag. The first,from depositional time of the Tongbomiao Formation to end that of the Nantun Formation,formed early extensional fault systems with extensional deformation under NW—SE tension stress fields. The second,when the 2^nd and 3^rd Member of the Yimin Formation deposited,formed middle tensional—shear fault systems with pure shear deformation under closely EW tension stress fields. Final,from end depositional time of the Yimin Formation to that of the Qingyuangang Formation,formed late inverse fault systems with contraction deformation under closely EW extrusion stress fields.Fault formation and evolution controlled formed period,growing types and distributed directions of traps. Long-term active faults were major transporting hydrocarbon fault types in the Beier Sag. Around source-rock,the basement block traps,tilted block and normal drag block traps with controlled by source faults were favorable areas of hydrocarbon migration and accumulation.
出处
《地质论评》
CAS
CSCD
北大核心
2011年第1期89-100,共12页
Geological Review
基金
国家大型油气田及煤层气开发科技重大专项"中国大型气田形成条件
富集规律及目标评价"项目(编号2008ZX05007)下属大型气田成藏机制与分布规律课题(编号2008ZX05007-03)的成果
关键词
断裂系统
演化
运聚
圈闭
油源断层
贝尔凹陷
海拉尔盆地
fault systems
evolution
migration and accumulation
traps
source faults
Beier Sag
Hailaer Basin
