摘要
断层端部破碎带是地下水、油气和含矿物热液等多种矿产资源勘探的有利目标区.按照次生断裂与主走滑断层端点的位置关系和形变性质,对方正断陷大罗密构造带走滑断层西南端的破碎带类型进行划分,通过几何特征分析,明确了破碎带形成时的区域应力状态,并结合油气分布规律,讨论了该区走滑断裂及破碎带的控藏作用,指出断层面优势运移路径与圈闭的空间配置是控制油气运聚的主要因素.研究结果表明：在区域右旋走滑作用控制下,走滑断层端部存在2种类型破碎带,一是端部西侧的应变伸展区发育正断层型破碎带,二是端部东侧的挤压区发育逆断层型破碎带,根据断裂展布特征,判断破碎带形成时最大水平压应力方向为N290°~300°.走滑断裂及其端部破碎带对油气成藏的控制作用总结为3个方面：走滑断裂及端部伴生断裂长期活动为油气运移提供输导通道,断层的断面脊部位是油气沿断裂运移的优势路径,与运移路径配置的断层下盘断背斜为油气富集场所.
Tip damage zones are good targets for exploration of many resources such as groundwater, hydrocarbons, or hydrothermal ore minerals. The types of damage zones around south- west tip of strike-slip fault in Daluomi structure belt of Fangzheng fault depression were classi- fied. Through the analysis of geometric features, this paper determined the stress state during the formation process of damage zones. Combined with the analyses of the hydrocarbon enrich-ment rules, the role of the strike-slip fault and associated damage zones in hydrocarbon accumulation was studied, which indicated that the spatial disposition between the dominated petro- leum migration pathways on fault planes and the entrapment were main factors controlling hydrocarbon migration and accumulation. The research proves that controlled by right-lateral strike slip motion, two types of damage patterns develop around tip of the master strike-slip fault, which includes the normal faults occurred in the extensional area on the west side of the master strike-slip fault, and thrust faults developed in the contractional area on the east side of the master fauk. According to the fault distribution characteristics, the orientation of the max- imum horizontal compressive stress during the damage zones formation was inferred as N290°- 300°. The role of strike-slip fault and tip damage zones in hydrocarbon migration and accumula- tion was summed in three aspects, that the long-term activity of strike-slip fault and associated damage zones provided conducting channel for petroleum migration; ridge structures of fault plane were the dominated petroleum migration pathways along the faults; the fault anticlines matched with the migration pathway were favorable for hydrocarbon accumulation.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2016年第3期553-561,共9页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(41502138)
黑龙江省青年科学基金项目(QC2015044)
东北石油大学青年科学基金项目(NEPUBS2014-02)
关键词
走滑断裂
端部破碎带
方正断陷
输导
控藏
strike-slip fault
tip damage zones
Fangzheng fault depression
migration
reser-voir-controlling
