独山子背斜构造演化序列及其对油气成藏的控制

独山子背斜位于准噶尔南缘四棵树凹陷,背斜北翼陡南翼缓,北翼近于直立,造成背斜北翼地震剖面呈现空白区。通过二维地震反射剖面和钻井资料精细构造解析,结合正演以及运动学数值模拟技术,提出独山子背斜构造模型:独山子背斜发育上、下两套滑脱层,下部滑脱层发育断层转折褶皱,上部滑脱层发育三角剪切型断层传播褶皱,构成一个叠加背斜构造。独山子背斜中上组合构造发育喜马拉雅运动期3期构造演化序列,即早期(N2d沉积时期)转折褶皱、中期(Q1沉积时期)传播褶皱及晚期(Q4沉积时期)冲断改造。喜马拉雅运动期3期构造演化序列控制了独山子背斜中上组合油气运聚与油气藏展布特征。

Cenozoic Tectonic Evolution Sequence in the Du shan zi Anticlineand Its Oil Gas Control

The Dushanzi anticline is located at the Sikeshu Sag of Junggar basin.Due to North Wing of the anticline is steep , South Wing of the anticline is slow,North Wing of the anticline is nearly vertical,which bring about the blank area in the North Wing. This paper puts forward a quantitative structure modeling method,which consists with comprehensive information (seismic,drilling and outcrop data) and two crucial techniques (the seismic modeling and kinematics simulation). Structure model was established by using this method. Dushanzi anticline developed upper and lower sets of slip layer,Dushanzi anticline is a fault bend fold in the Bottom,Dushanzi anticline is a trishear-fault propagation fold in the top ,which Constitute a superimposed anticlines. This paper established the three tectonic evolution sequence of Dushanzi anticline, that early (N2d deposition ago) bend fold, medium (Q1 period) propagation folds and late (Q4 period) thrust transformation. This three tectonic evolution sequence of Dushanzi anticline have some control and transformation effect in the upper combination of hydrocarbon accumulation.