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元坝地区须三气藏储集层以中粗粒钙屑砂岩、粉细砂岩为主,孔隙度平均值1.82%~2.61%,渗透率平均值0.016~0.029 m D,属低孔低渗致密砂岩储层,储集层裂缝较发育,且裂缝对改善储集层的孔隙度和渗透率影响较大。本文运用常规测井资料通过岩心标定裂缝的测井响应特征,利用砂岩裂缝交会分析方法,优选声波时差、密度两个参数建立的判别方程,通过逐步判别识别原理及概率计算,对单井进行裂缝识别,并进行裂缝孔隙度和宽度的计算,绘制单井裂缝参数解释剖面,评价单井裂缝发育情况,建立该储集层裂缝识别的综合标准。
In the Yuanba area, the gas reservoirs in the three reservoirs are mainly coarse-grained calcium-bearing sandstone and fine sandstone with the average porosity of 1.82% -2.61% and the average permeability of 0.016-0.029 m D, which belongs to the low porosity and low permeability Sandstone reservoirs and reservoirs have developed more fractures, and fractures have a greater impact on improving the porosity and permeability of reservoirs. In this paper, we use conventional log data to characterize the logging responses of cores by calibrating cores. By using sand fractures intersection analysis method, we choose the discriminant equations established by two parameters of acoustic time difference and density. By means of stepwise discriminant principle and probability calculation, Identify and calculate fracture porosity and width, draw single-well fracture parameters to explain the profile, evaluate single well fracture development, and establish a comprehensive standard for reservoir fracture identification.