准噶尔盆地南缘齐古背斜构造解析与平衡演化

Structural Analysis and Balance Evolution of Qigu Anticline in the southern edge of Junggar Basin

选取齐古背斜典型地震剖面,结合地表构造测量和钻井资料等,运用断层相关褶皱理论研究构造样式,通过平衡恢复技术正演地震剖面的变形过程,建立齐古背斜构造模型,构建齐古背斜平衡构造剖面,厘定准噶尔盆地南缘齐古背斜构造变形机制和演化史,为油气勘探提供有力支撑,多口井获高产工业油气流。研究表明:准南山前第一排构造发育两期构造变形,山前的构造样式以基底卷入构造楔为主,齐古背斜受隐伏构造楔前端反向断层控制,反向断层下盘为油气勘探有利区,两期构造演化控制齐古背斜油气成藏。

The Southern Junggar Basin is characterized by intense tectonic deformation and complex structural form,and the tectonic period and structural styles are of great significance for the exploration of oil and gas in this area.However,due to the low signal-to-noise ratio of seismic data and the poor imaging of the seismic profiles,the structural style and evolution sequence is controversial.This article choose the typical seismic section of the Qigu anticline,combining the surficial structural survey and drilling data,etc.,using the fold related to fault theory to study structural style.We resume the deformation process of seismic section,establish the structure model of Qigu anticline,build the balanced structure section of the Qigu anticline,and work out the tectonic deformation mechanism and evolution of Qigu anticline in southern margin of Junggar basin,using balancing recovery technique,which provide oil and gas exploration great support,and many wells have got commercial oil and gas flow.Research has shown that there are two-step tectonic deformations before the first row of southern Junggar,mountain front model of structure gives priority to the basement involved in tectonic wedge,Qigu anticline is controlled by reverse fault before the concealed tectonic wedge,the footwall of reverse fault is the exploration favorable area for oil and gas,and the two-step tectonic deformations controlled the hydrocarbon accumulation in Qigu anticline.