川西DY构造须家河组致密砂岩储层裂缝有效性分析  

Fracture Validity Analysis for Xujiahe Dense Sandstone Formation in Western Sichuan DY Structure

作　　者：柳智利[1,2] 秦启荣[1] 王志萍[1] 向俊铭[1] 

机构地区：[1]西南石油大学,成都610500 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《重庆科技学院学报（自然科学版）》2010年第5期38-41,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家油气重大专项(2008ZX05001)

摘　　要：川西DY构造须家河组致密砂岩储层的主要控制因素是裂缝,对裂缝有效性的分析直接决定着储层评价的质量。在掌握研究区构造特征的基础上,结合裂缝描述的基本资料,根据裂缝有效性影响因素,提出四点有关裂缝有效性的新认识:一是构造强度和构造几何形态决定裂缝发育强度,构造运动决定构造系方向;二是须家河组地层的煤系地层充填作用强烈,堵塞了裂缝;三是只在局部发育溶蚀缝和溶蚀孔洞;四是DY构造中部DY1井-DY2井-DY101井区裂缝走向与现今最大主应力方向近于一致,裂缝的张开度增大,连通性变好。综合分析认为,DY地区裂缝有效性总体较差,DY1-DY7-DY102井地区相对较好。Xujiahe dense sandstone formation in Western Sichuan DY structure is mainly controlled by fi＇acture. Therefore,the fracture validity analysis directly determines the quality of reservoir evaluation.Based on the structural features and the basic information about the fracture description, the paper studies the fracture validity and comes to four conclusions：l.The tectonic stress and structural geometry determines the development of fracture, and the tectonic movement determines the structural family direction;2.Xujiahe coal formation is mostly filled.Coal and mud layer is pressed into the fracture for their plasticity;3.The dissolution fractures and caves are only developed partly;4.The direction of well DY1 -DY2 -DY101 is consistent with direction of the maximum main stress.The fractures open largely and are connected with each other.The direction of the other fractures has an angle with the maximum main stress.The generalized analysis show the fracture validity of DY region is bad and that of DY1-DY7-DY102 well is better.

关 键 词：DY构造 须家河组 裂缝 有效性 现今地应力 

分 类 号：TE122[石油与天然气工程—油气勘探]