松辽盆地南部长岭断陷区深层构造特征与天然气聚集

Structural characteristics and gas accumulation in the deep of the Changling Fault Depression,the South Songliao Basin

张玮 李洪革 李明杰

Zhang Wei Li Hongge Li Mingjie

在充分利用二维地震大剖面、三维地震资料以及钻/测井信息的基础上,结合高精度重磁电信息,系统的解剖了长岭断陷的区域地质结构,认为长岭断陷非单一简单断陷,而是由多个主次断陷组成的复式断陷群,且与北部的古龙断陷连为一体.在连片工业制图的基础上,进行了构造单元及区带划分.分析了主要断裂的几何学及运动学特征,研究了断陷构造演化,将其分为断陷基底形成期、断陷发育期及断陷改造期等3个阶段.在油气地质条件分析的基础上,研究了不同类型天然气的成藏特征,指出了有利勘探方向.

Large 2D seismic sections,3D seismic data,and drillinglog data,combined with high-accuracy gravity,magnetic and electric survey data,were used in a systematical analysis of the regional geological structure in Changling fault depression.It is suggested that the Changling fault depression is not a simple single fault depression but a complicated fault depression cluster,which is composed of many primary and secondary fault depressions and connected with the northern part of Gulong fault depression.Structural units and plays in the area are identified based on integrated industrial mapping.Geometric and kinematic analyses of the main faults are also carried out and based on that,the structural evolution of the fault depressions is studied and divided into the following three periods: basement formation,fault depression development,and modification.With analyses of petroleum geological conditions,the accumulation characteristics of different gas reservoirs are studies and potential exploration targets are defined.

10.11743/ogg20080119