松辽盆地南部孤店断陷断裂构造特征及演化

Fault structure characteristics and evolution in the Gudian fault depression, southern Songliao Basin

刘伟 唐大卿 陈明月 张勇杰 陈栗 李楠

中国地质大学（武汉）资源学院，湖北 武汉 430074 构造与油气资源教育部重点实验室，湖北 武汉 430074 中国石油吉林油田分公司勘探开发研究院，吉林 松原 138000）

School of Earth Resources, China University of Geosciences, Wuhan 430074, China MOE Key Laboratory of Tectonics and Petroleum Resources, Wuhan 430074, China Research Institute of Exploration and Development, Jilin Oilfield Company, PetroChina, Songyuan 138000, China

松辽盆地是发育于我国东北地区的大型中新生代断坳盆地，断裂构造极其发育并对盆地的沉积构造演化及油气成藏具有重要控制作用。文中通过对松辽盆地南部孤店断陷三维地震资料的精细构造解释，系统研究了该断陷的断裂构造类型、几何学特征及成因演化。孤店断陷断裂空间上具有明显分期、分区、分带、分段及分层差异活动特征，多期幕式活动的边界断裂及斜坡带主干断裂控制着继承性断陷的发育。孤店断陷断裂活动与松辽盆地中新生代所经历的多旋回构造运动相统一，主要经历了四大阶段6个活动期次，即断陷期（火石岭组—营城组沉积期）的3期幕式伸展、断坳转换期（登娄库组沉积期）的1期弱伸展、稳定坳陷期（泉头组—嫩江组沉积期）的1期短暂而强烈的张扭性伸展以及构造反转期（嫩江组末期—现今）边界主断裂的幕式反转逆冲。

Abstract: The Songliao Basin is a large Mesozoic-Cenozoic fault-depression basin developed in the NE China. The fault structures are extremely developed and play a very important role in controlling sedimentary evolution and hydrocarbon accumulation in the basin. Based on the detailed structure interpretation of  3D seismic data of Gudian fault depression in southern Songliao Basin, this paper systematically analyzes the fault structure types, geometric characteristics and genetic evolution. The faults in Gudian fault depression have differential characteristics of staging, zoning, segmentation and stratification in space. The boundary faults with multi-stage episodic activity and main faults in the slope control the development of the inherited fault depression. The fault activities of the Gudian fault depression is consistent with the multi-cycle tectonic movements experienced during the Mesozoic-Cenozoic of the Songliao Basin, it mainly experienced six active phases belonged to four major stages: three episodic extension phases in the fault depression stage (from Huoshiling Formation to Yingcheng Formation), one weak extension phase in the fault-depression transition stage (Denglouku Formation), one fast and intense transtensional extension phase in the stable depression stage (from Quantou Formation to Nenjiang Formation) and the episodic reversal thrusting of the boundary faults in the structural inversion stage (from the end of Nenjiang Formation to now).

10.6056/dkyqt202206015