某区块储层裂缝特征及其对注气开发的影响

Characteristics of reservoir fracture and its influence on gas injection in one block

王兆生１ 唐小梅 陶娴娴 张振国１ 程子翔 殷世艳 杜敬国

河北联合大学矿业工程学院，河北 唐山 063009 中国石油集团长城钻探工程有限公司测井技术研究院，北京 100101 中国石油新疆油田公司石西油田，新疆 克拉玛依 834000 中国石油大学（北京）地球科学学院，北京 102249

College of Mining Engineering, Hebei United University, Tangshan 063009, China Research Institute of Logging Technology, Great Wall Drilling Company, CNPC, Beijing 100101, China Shixi Oilfield, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China College of Geosciences, China University of Petroleum, Beijing 102249, China

某区块属于低渗透砂岩油藏，裂缝对储层的物性有重要影响。利用岩心观察、测井分析和生产动态分析等方法，对裂缝发育特征展开系统研究。结果表明：该区块主要发育构造成因的高角度剪切裂缝；工区内发育东西向、南北向、北西向和北东向4组裂缝，受现今地应力影响，东西向裂缝的地下开度大，是该区的主要渗流方向；裂缝发育程度主要受岩性、岩层厚度、断层等因素的影响；裂缝是影响注气开发早期气体突破和开发效果的重要因素。

One block belongs to low permeability sandstone reservoir. Fractures have important effects on the physical property of reservoir. Based on the detailed description and observation of drilling cores, log interpretation and production performance analysis, the fracture development characteristics are studied systematically. Result shows that the shear fractures with high angle mainly develop in this block. In the work area, there are four sets of fractures, which are in east-west, south-north, north-west and north-east directions. Because of the influence on present stress field, the east-west fractures have big aperture and are the main seepage channels in this area. The development degree of fractures is mainly controlled by the factors such as lithology, strata thickness and fault, etc. Fracture is an important factor to influence the development effect and the gas breakthrough at the early stage of gas injection.

10.6056/dkyqt201302012