Structural Characteristics and Geological Significance of Karayulgun Fault in Northern Tarim Basin

Abstract

Abstract: Karayulgun fault located in Northern Tarim Basin is one of northwest-trending faults of Northern Tarim Basin. Based on field investigation and interpretation of seismic profiles, it is found that Karayulgun fault is a right-lateral strike-slip fault accompanied with North-Ka, Mid-Ka, and South-Ka en echelon folds and secondary faults that are consistent with classical theoretical model of strike-slip fault. Karayulgun fault belt developed on the basis of NW-trending reverse faults in Paleozoic, which experienced compression in Paleozoic, calm sedimentation in Mesozoic, and compression and strike-slip movement in Cenozoic. The location between Wushi-Wensu and Kuqa-Tabei units makes the fault regulate the differential deformation of the two regions. The fault and associated structures provide a favorable condition for hydrocarbon migration and accumulation.

Key words: Karayulgun fault, right-lateral strike-slip fault, en echelon folds, accommodation zone

摘要： 喀拉玉尔滚断裂系位于塔里木盆地北部，是塔北系列北西向展布的断裂之一。为了研究喀拉玉尔滚断裂系性质以及对塔北构造格局的影响，通过野外考察以及地震剖面解释，得出喀拉玉尔滚断裂为一条北西向右旋走滑断裂，受挤压-剪切作用，伴生北喀、中喀和南喀3个雁列褶皱以及次级断裂，为典型走滑断裂展布形态。喀拉玉尔滚断裂带由古生界北西向构造带继承演化而来，曾经历古生代强烈挤压构造运动、中生代平静沉积、新生代斜冲运动3期构造作用，形成了现今地表构造样式。喀拉玉尔滚断裂带处在乌什-温宿构造单元和库车-塔北构造单元之间，对两侧变形、差异压缩起到调节作用。喀拉玉尔滚走滑断裂及其伴生构造的发育可能对油气的运移和聚集产生有利条件。

关键词: 喀拉玉尔滚断裂, 右旋走滑断层, 雁列褶皱, 调节带

CLC Number:

P542

HE Dian,LI Jianghai,LI Baishou. Structural Characteristics and Geological Significance of Karayulgun Fault in Northern Tarim Basin[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

贺电,李江海,李百寿. 塔北喀拉玉尔滚断裂系构造特征及地质意义[J]. 北京大学学报（自然科学版）.

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Structural Characteristics and Geological Significance of Karayulgun Fault in Northern Tarim Basin

塔北喀拉玉尔滚断裂系构造特征及地质意义

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