新场气田须二气藏天然裂缝有效性定量表征方法及应用  

Quantification characterization of the valid natural fractures in the 2^(nd) Xu Member,Xinchang gas field

作　　者：邓虎成[1,2] 周文[1,2] 周秋媚 陈文玲[2] 张昊天[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室,成都610059 [2]成都理工大学能源学院,成都610059 [3]College of Earth and Mineral Sciences,Pennsylvania State University

出　　处：《岩石学报》2013年第3期1087-1097,共11页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(41202096);高等学校博士学科点专项科研基金项目(20105122120006)联合资助

摘　　要：天然裂缝是地层中广泛分布的一种地质构造现象,当其在油气开发过程中保持一定有效性时具有重要作用,其有效程度高低是裂缝性油气藏高产富集的关键。本次研究以川西新场气田须二气藏裂缝特征及成因认识为基础,利用气藏各类动静态资料对裂缝张开度、裂缝渗透率、裂缝孔隙度等参数进行解释和评价,明确了不同资料计算获取裂缝参数的物理含义及相互之间的关系,为裂缝有效性评价奠定了基础。文中以井筒附近、地质模型网格单元体内裂缝网络系统作为裂缝有效性定量表征对象,通过裂缝网络系统裂缝参数的分布特征,选取并组合了参数分布的特征变量从而建立了裂缝有效性定量表征指标;基于裂缝有效性定量表征方法和建立的定量表征指标对新场气田须二气藏单井产层段裂缝的有效性及气藏裂缝有效性的纵横变化规律进行了研究和评价,其评价结果与区域构造、应力场分布、井下监测、生产动态具有很好的一致性。本文对油气藏中天然裂缝有效性的认识和定量表征方法为裂缝性油气藏地质建模中裂缝有效参数场的建立和数值模拟工作奠定了基础,为裂缝性油气藏的描述和生产动态研究提供了方向和思路。The natural fracture is a geological phenomenon which is widely distributed in the strata, and plays an important role in the oil ＆ gas development. The fracture~ effectiveness level is the key to get high oil ＆ gas yielding and enrichment in fractured oil ＆ gas reservoirs. Based on the characteristics and igneous cognition of fractures and all kinds of static and dynamic data in the 2na Xu Member gas reservoirs in Xinchang gas field in western Sichuan, the parameters such as aperture, permeability and porosity of fractures are interpreted and evaluated. The physical meanings of fracture parameters obtained from different data are clear that laid the foundation of the fracture effectiveness evaluation. Choose the fracture network system of geologic model grid cells near the wellbores for the quantitative characterization effectiveness objects, using the fracture parameters distribution characteristics of the fracture network system, the variables of the parameters distribution characteristics are selected and combined so as to establish the quantitative indicators of fracture effectiveness. Based on the quantitative characterization ideas and the quantitative indicators of fracture effectiveness, the fracture effectiveness and its vertical and horizontal distribution in single well production layer in the 2＂d Xu Member gas reservoirs, Xinchang gas field are researched and evaluated. The evaluation results have a good consistency with the regional tectonic, stress field distribution, underground monitoring, production dynamics. Recognize and quantitative methods for effectiveness characterization of natural fractures laid the foundation of the establishment of the effective parameters of fractures and numerical simulation in the geological modeling of fractured reservoirs and also provide direction and ideas for fractured reservoir description and production dynamic research.

关 键 词：裂缝有效性 须家河组 新场气田 四川盆地西部 

分 类 号：P618.130.2[天文地球—矿床学]