盆腹区张扭断裂带与盆缘造山带成因关系及油气成藏控制——以准噶尔盆地盆1井西凹陷东环带侏罗系为例

Genetic relationship between transtensional fault zones in the hinterland of the basin and orogenic belts in the margin of the basin and its control on hydrocarbon accumulation: a case study of Jurassic in the east belt around Pen-1 well west s

梁舒艺,洪扬,崔立杰

中海石油（中国）有限公司天津分公司，天津 300452 中国石油渤海钻探工程有限公司第三钻井工程分公司，天津 300280 中国石油大学（华东）地球科学学院，山东 青岛 266580

Tianjin Branch of CNOOC Ltd., Tianjin 300452, China The Third Drilling Company of Bohai Drilling Engineering Co., Ltd., CNPC, Tianjin 300280, China School of Geoscience, China University of Petroleum, Qingdao 266580, China

依据盆1井西凹陷东环带高精度三维地震资料解释成果，通过断裂平面、剖面特征、断裂体系及成因机理的研究，明确了盆腹区燕山期张扭性走滑断裂的发育。文中首次将盆腹区的走滑应力机制与盆缘造山带置于同一构造背景中研究。受克拉美丽主断裂右旋走滑应力机制影响，研究区沿Sylvester简单剪切模式中的R′方向发育左旋走滑断裂，并派生出次级断裂，构成盆1井西凹陷东环带的莫北凸起、石东鼻凸等近NE向的燕山期张扭性走滑断裂体系，张扭性构造控制着盆腹区的油气成藏和富集。研究结果对盆缘造山带与盆内腹部区的构造演化和应力机制研究有指导和借鉴意义。

Based on the interpretation results of high-precision 3D seismic data in the east belt around Pen-1 well west sag, through the study of fault plane and profile characteristics, fault system and genetic mechanism, the development of Yanshan period transtensional strike-slip faults in the hinterland of the basin is clarified. The strike-slip stress mechanism in the hinterland of the basin and orogenic belts in the margin of the basin were studied in the same structure background for the first time. Affected by the dextral strike-slip stress mechanism of kelameli main fault, the study area develops sinistral strike slip faults along the R′ direction in the Sylvester simple shear model, and secondary faults were derived, which constituted a nearly NE trending transtensional strike-slip fault system such as Mobei uplift and Shidong nose bulge in the east belt around Pen-1 well west sag. The transtensional structures control hydrocarbon accumulation and enrichment in the hinterland of the basin, which has guiding and reference significance for the study of tectonic evolution and stress mechanism of the orogenic belt in the margin of the basin and in the hinterland of the basin.

10.6056/dkyqt202106016