松辽盆地东缘营城组节理构造特征、分布规律及其储层预测

首次较系统地统计了研究区节理产状、规模、开度、密度以及分布规律,阐述了其储层意义。根据节理产出层位、切割关系和区域构造背景分析,将研究区节理的形成期次划分为营城期、营城末期和晚白垩世晚期3个期次。利用共轭节理产状和节理面性质,计算出营城期具有近东西向伸展和挤压相互交替的构造应力场;营城组末期具有NE—SW向挤压构造应力场;晚白垩世晚期具有NW—SE向挤压构造应力场。营城组中的节理形成与分布主要与前两期挤压应力场有关。在此基础上,对徐家围子地区营城组节理分布规律进行了预测,为天然气储层分布规律研究提供可视化对比依据。

Joint Structure Features,Distribution Regularity and Reservoir Prediction of Yingcheng Formation in Eastern Songliao Basin

It was the first time to carry out the systematical statistical analysis on the joint occurrence,scale,width,density and distribution regularities to elaborate the reservoir significance.Accor-ding to the analysis of joint position,the inter-cutting relationship and the regional tectonic settings,the formation epochs of joints in the target area were divided into three epochs,namely,Yingcheng epoch,the last stage of Yingcheng epoch and the late stage of K2.By using conjugate joint occurrence and joint nature,basing on the statistics and calculation,Yingcheng epoch had nearly EW direction tectonic stress field with stretch and compression alternatively,NE-SW direction tectonic stress field was formed in the last stage of Yingcheng epoch,NW-SE direction compressional tectonic stress field was formed in the last stage of K2.It was considered that the joint formation and distribution of Yingcheng Formation were mainly related with the first two compressional tectonic stress fields.The joint distribution regularities of Yingcheng Formation in Xujiaweizi region were predicted,which provides the visual correlation for the study on the distribution regularities of natural gas reservoir.