松辽盆地东缘中生代断裂构造特征、形成期次及其储层意义

松辽盆地东缘中生代断裂构造十分发育。在对松辽盆地东缘营城组详细野外地质调查基础上，较系统刻画了断裂的性质、产状和时空分布规律，将研究区中生代断裂活动划分出海西晚期CD1]印支期、营城期、营城末期和晚白垩世晚期4期。依据营城组火山口的分布规律首次识别出营城期隐伏断裂，该断裂控制了营城组火山岩的形成和分布。在研究区发现了营城期南北向断裂，为与徐家围子地区庆深气田营城组中的南北向断裂对比提供了重要依据。营城期本区处于近东西向伸展断陷和挤压逆冲相互交替的构造应力场中,营城末期受佳木斯-伊通和四平-哈尔滨两条左旋走滑断裂的强烈影响，形成北东-南西向的构造应力场，控制了北东向基性岩脉的侵入和大量北东向、北西向走滑断层的形成。认为研究区与徐家围子地区营城期及营城末期断裂具有明显的可比性，为庆深气田火山岩储层分布规律预测奠定了构造基础。

Feature, Epoch and Reservoir Significance of the Mesozoic Faults at the Eastern Margin of the Songliao Basin

Mesozoic faults at the eastern margin of the Songliao Basin were well developed.Based on detailed field geological survey of the Yingcheng Formation at the eastern margin of the Songliao Basin,the nature,attitude and spatial and temporal distribution regularities of these faults were systematically described.The formation of these Mesozoic faults was divided into four epochs,namely,Later Variscan-Indosinian,Yingcheng,the last stage of Yingcheng epochs and the late stage of the Later Cretaceous.Based on the distribution regularity of the craters in the Yingcheng Formation,the concealed faults of the Yingcheng epoch were identified for the first time and were considered to have controlled the formation and distribution of the volcanic rocks of the Yingcheng Formation.The NS trending faults of the Yingcheng epoch discovered in the area could also sever as a comparison for the NS faults of the Yingcheng Formation in the Qingshen gas field in the Xujiaweizi area.It was suggested that and alternative tectonic stress field of EW trending extense depression and of EW trending compressive thrust existed in the Yingcheng epoch.A NE-SW trending tectonic stress field was introduced by two left-lateral strike-slip faults called the Jiamusi-Yitong and Siping-Harbin respectively at the final stage of the Yingcheng epoch,and the resulted stress field in turn controlled the intrusion of some NE trending basic dikes and development of several NE and NW trending strike-slip faults.It was believed that the faults in the study area could be compared with those in the Xujiaweizi area of both the Yingcheng epoch and of the final stage of the Yingcheng epoch,which set a basis for predicting the distribution regularities of volcanic rock reservoirs in the Qingshen gas field.