【摘要】 探讨致密砂岩储层裂缝的识别,为川西须二天然气的勘探开发提供部署靶点。通过对川西须二段致密砂岩储层及裂缝进行地质、实验、测井、3D3C地震资料的在点、线、面上的综合研究,结果表明须二储层宏观与微观裂缝都发育,且发育网状缝与高角度缝。裂缝占总孔隙度平均为9.33%,而裂缝发育对渗透率的增加是不发育裂缝致密储层的21.6倍。在点、线、面的综合研究方法对致密砂岩储层裂缝的刻画与识别的基础上,编制了川西孝新地区须二段裂缝发育分布图。更多还原

【Abstract】 The gas exploration and development of the tight sandstone reservoir are affected by fractures and the reservoir of Member 2 of Upper Triassic Xujiahe Formation(T3x2) belongs to the tight sandstone reservoir in West Sichuan with poor porosity and permeability.The fractures control the exploration and development results of the reservoir,so the research of the fractures in the tight sandstone reservoir is the key to exploration and development.This paper first researches the fractures of core with geological description,3-D CT scan,full-diameter core in T3x2,and forms the exact point on the characterization.Secondly it makes fracture identification by analyzing the reservoir section of conventional logging response characteristics of different types of fractures,using imaging logging,and 3-D finite element method of laterolog.At last,it uses multi-wave splitting technique to research and identify the distribution of the fractures in plane with 3-D 3C seismic data.This forms the research methods series of identifying fractures with point,line,and surface and the fracture system of geological reserves can be also calculated.The methods not only offer the exact targets in the tight sandstone reservoir gas exploration,but also the effective guidance of evaluation and development of reserves.更多还原