IDENTIFICATION OF GAS-WATER ZONES IN VOLCANIC RESERVOIRS IN SICHUAN BASIN BASED ON PROBABILITY DISTRIBUTION OF LOGGING CURVES
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摘要:
火山岩的矿物成分复杂，主要矿物有石英、正长石、斜长石、云母、角闪石、辉石和橄榄石.不同岩性的储层物性和孔隙结构类型各不相同，这给火山岩气水层判别造成很大困难.基于测井资料，首先采用中子-密度交会图的方法求取孔隙度，然后结合实验室的岩电参数以及测井的电阻率曲线，构建P1/2概率分布曲线，根据概率曲线的分布形态来识别火山岩的气水层.将研究方法应用到四川盆地的火山岩储层，对气水层进行了判别，解释结论与试气结论符合.说明可以应用这些方法识别四川盆地火山岩储层的气水层，可以指导其他岩性储层的气水层识别.
Abstract:The mineral compositions of volcanic rocks are complex, including mainly quartz, orthoclase, plagioclase, mica, hornblende, pyroxene and olivine. Due to various reservoir properties and pore structure types of different lithology, it is difficult to identify gas-water zones in volcanic rocks. Based on the logging data, first, the method of neutron-density crossplot is used to calculate porosity, and then the P1/2 probability distribution curve is constructed combined with the laboratory rock electrical parameters and logging resistivity curve to identify volcanic gas-water zone according to the distribution pattern. The method is applied to the volcanic reservoirs in Sichuan Basin to identify the gas-water zones, and the interpreting conclusion is consistent with the gas testing results, indicating that the method is feasible and effective, and can guide the identification of gas-water zones in other lithology reservoirs.
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