普光大湾地区断裂系统自动识别及裂缝建模研究

摘要

For Dawan block of Puguang gas field,a typical fractured-porosity gas reservoir,the identification and characterization of fracture system have essential meanings to the productivity construction and development.However,under the background of the development of reverse fault,Dawan block has very developed fractures and strong heterogeneity,which cause it is more difficult to use the known well of each block to predict the reservoir property of interwell and other fault block.The method of multidisciplinary analysis is adopted,makes comprehensive use of seismic,drilling,logging,geological data and research results,applies the automatic analysis technology of fault-system and the modeling technology of discrete fracture network,uses a combined regimen of deterministic modeling and stochastic modeling,establishes the discrete fractured model of the reservoir interval of Feixianguan and Changxing group in Dawan gas reservoir,characterizes the distribution of fractures.Therefore,the accurate and quantitative description of fracture system is realized,which provides effective guidance for further development and study of gas field.%作为典型的裂缝孔隙型气藏,裂缝系统的识别和表征对于普光气田大湾区块产能建设和后期开发具有至关重要的意义.但是,该区块在逆断裂发育背景下,裂缝发育,非均质性更强,利用已知分属各断块的井预测井间、其他断块的储层属性也变得更加困难.为此,本文采用多学科协同分析方法,综合利用地震、钻井、测井、地质资料和研究成果,应用断裂系统自动分析技术和离散裂缝网格建模技术,采用确定性建模和随机性建模相结合的方法,建立了大湾气藏储层段飞仙关组、长兴组的离散裂缝模型,表征了裂缝的纵向、横向分布特征,实现了对储层裂缝系统精确、定量的描述,为气田下步开发研究提供了有效指导.