塔里木盆地寒武-奥陶系走滑断裂系统特征及其控油作用
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摘要
用新三维地震资料,对塔里木盆地寒武-奥陶系海相碳酸盐岩中发育的走滑断裂系统进行了研究。研究结果认为,研究系统中主要发育着花状构造、雁列构造、拉分地堑、辫状构造、剪切断裂带等多种构造样式。晚加里东-早海西运动期受阿尔金地区强烈的斜向碰撞挤压作用,在塔中地区形成一系列北东向的左旋走滑断裂;晚海西运动期受控南天山洋的斜向闭合拼贴作用,在塔北隆起轴部发育北东东向的压扭断裂,在塔北隆起南缘发育近南北向右旋走滑断裂;印支-燕山运动期受阿尔金走滑作用,在塔东发育左旋压扭断裂;喜马拉雅运动晚期受西昆仑-帕米尔斜向挤压,在巴楚地区发育压扭-走滑断裂。走滑断裂形成演化具有多期性、断裂发育具有继承性与区段性。走滑断裂对碳酸盐岩储集层具有强烈的改造作用,走滑断裂破坏早期古油藏,是晚期油气运聚的主要通道,走滑断裂带造成油气分布的区段性。
The analysis of latest 3D seismic data shows that strike-slip fault system occurred in the Cambrian-Ordovician marine carbonate rocks in Tarim basin.The structural styles appeared in flower structure,en echelon structure,pull-apart graben,braided structure,shear fault zone,etc.Multi-stage declinate convergences of the structures formed four evolution stages and distributions of four blocks of strike-slip fault.A series of NE-trending sinistral strike-slip faults developed in the northern slope of Tazhong uplift under the intensive oblique collision by Altym Tagh in the period of late Caledonian to early Hercynian.Controlled by the south Tianshan ocean closure in the late Hercynian,there are NEE-trending compresso-shear faults in the axial part of Tabei uplift and near SN-trending dextral strike-slip faults developed in the southern margin of Tabei uplift.By the Altym Tagh strike-slip fault action in Indosinian-Yanshan movement,the sinistral compresso-shear faults developed in Tadong area(eastern Tarim basin).In late Himalayan,the compresso-shear and strike-slip faults are distributed in Bachu areat under west Kunlun-Pamir oblique squeezing action.It is concluded that the formation and evolution of strike-slip faults are characterized by multiple stages,the faults development by inheritance and segmentation.The strike-slip faults are of great effects on the carbonate reservoirs.The early paleo-reservoirs were destroyed by the strike-slip faults which became the main passageway for late hydrocarbon migration and accumulation.The segmentation of hydrocarbon distribution resulted from the strike-slip faults.
The analysis of latest 3D seismic data shows that strike-slip fault system occurred in the Cambrian-Ordovician marine carbonate rocks in Tarim basin.The structural styles appeared in flower structure,en echelon structure,pull-apart graben,braided structure,shear fault zone,etc.Multi-stage declinate convergences of the structures formed four evolution stages and distributions of four blocks of strike-slip fault.A series of NE-trending sinistral strike-slip faults developed in the northern slope of Tazhong uplift under the intensive oblique collision by Altym Tagh in the period of late Caledonian to early Hercynian.Controlled by the south Tianshan ocean closure in the late Hercynian,there are NEE-trending compresso-shear faults in the axial part of Tabei uplift and near SN-trending dextral strike-slip faults developed in the southern margin of Tabei uplift.By the Altym Tagh strike-slip fault action in Indosinian-Yanshan movement,the sinistral compresso-shear faults developed in Tadong area(eastern Tarim basin).In late Himalayan,the compresso-shear and strike-slip faults are distributed in Bachu areat under west Kunlun-Pamir oblique squeezing action.It is concluded that the formation and evolution of strike-slip faults are characterized by multiple stages,the faults development by inheritance and segmentation.The strike-slip faults are of great effects on the carbonate reservoirs.The early paleo-reservoirs were destroyed by the strike-slip faults which became the main passageway for late hydrocarbon migration and accumulation.The segmentation of hydrocarbon distribution resulted from the strike-slip faults.
引文
[1]李明杰,胡少华,王庆果,等.塔中地区走滑断裂体系的发现及其地质意义[J].石油地球物理勘探,2006,41(1):116-121.
[2]杨海军,郝芳,韩剑发,等.塔里木盆地轮南低凸起断裂系统与复式油气聚集[J].地质科学,2007,(4):795-811.
[3]左龙凭,李铁,曹杨.塔里木盆地巴楚凸起构造特征及含油气远景[J].新疆石油地质,2001,21(5):411-413.
[2]杨海军,郝芳,韩剑发,等.塔里木盆地轮南低凸起断裂系统与复式油气聚集[J].地质科学,2007,(4):795-811.
[3]左龙凭,李铁,曹杨.塔里木盆地巴楚凸起构造特征及含油气远景[J].新疆石油地质,2001,21(5):411-413.
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