塔里木盆地顺北及邻区主干走滑断裂带差异活动特征及其与油气富集的关系

选取位于塔里木盆地顺北及其邻区的托普39断裂体系，顺北1与顺北5断裂带为研究对象，通过对断裂活动特征和期次进行精细解剖，运用断裂力学对演化机制进行力学分析，并结合大量单井生产动态资料深入探讨了走滑断裂对油气富集的控制作用。研究结果表明，托普39断裂体系与顺北1、顺北5断裂带在几何学特征、运动学特征以及构造演化方面存在根本差异。NNE向托普39断裂带早期在共轭走滑状态下左行活动，晚期受最大主应力方向变化的控制，反转为右行走滑，而同体系中的NNW向次级断裂晚期几乎未活动。顺北5断裂（NNW-NS向）带先于NE向顺北1断裂形成，其构造演化经历了不同的应力环境和最大主应力方向的变化。托普39断裂带主活动期为喜马拉雅期，与油气成藏期匹配，控制了油气的富集，且叠接拉分段是更有利的富集部位。此外，基于对顺北1断裂带上多口井生产动态资料分析表明，油气在相对活动强的雁列正断层所对应的下伏走滑平移段和叠接拉分段富集程度更高。

Characteristics of differential activities in major strike-slip fault zones and their control on hydrocarbon enrichment in Shunbei area and its surroundings,Tarim Basin

The faulting characters and evolution history of the Tuopu 39 fault system,and the Shunbei 1,Shunbei 5 fault zones,distributed in Shunbei area and its surroundings,Tarim Basin,were investigated in detail.Based on the analysis of fault evolution on mechanics and large amount of single-well production performance,we fully discussed the control of strike-slip faults on hydrocarbon enrichment.The integrated analyses reveal fundamental differences between the Tuopu 39 fault system and the Shunbei 1,Shunbei 5 fault zones in terms of geometries,kinematics,and structural evolution.The NNE-trending Tuopu 39 fault system experienced sinistral movement in conjugate strike-slipping state at the early stage,but turned to dextral strike-slipping at the late stage due to the change of the orientation of maximum principal stress.In comparison,the NNW-trending secondary faults inside the system were almost inactive.Shunbei 5 fault zone(NNW-NS-trending) formed ahead of the NE-trending Shunbei 1 fault zone and experienced different stress regimes and changes of the maximum principal stress orientation.The faulting movements of Tuopu 39 fault system in the late stage occur in Himalayan period,the same as hydrocarbon accumulation,thus control the hydrocarbon enrichment,particularly in the pull-apart areas along the fault zone.The analysis on multiple production wells on Shunbei 1 fault zone suggests that the underlying strike-slip fault segments and the juxtaposed pull-apart intervals corresponding to the en echelon normal faults of relative bigger intensity are more enriched in hydrocarbons.