测井曲线概率分布法识别四川盆地火山岩气水层  

IDENTIFICATION OF GAS-WATER ZONES IN VOLCANIC RESERVOIRS IN SICHUAN BASIN BASED ON PROBABILITY DISTRIBUTION OF LOGGING CURVES

作　　者：张丽华[1] 潘保芝[1] 单刚义[1] ZHANG Li-hua;PAN Bao-zhi;SHAN Gang-yi(College of Geo-Exploration Science and Technology,Jilin University,Changchun 130026,China)

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《地质与资源》2022年第1期115-120,114,共7页Geology and Resources

基　　金：国家自然科学基金面上项目“深部超临界热储流体-岩石综合电性特征与电磁响应研究”(NSFC 42074119).

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P^(1/2)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.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 P^(1/2) 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.

关 键 词：火山岩 气水层识别 中子-密度交会 测井曲线 胶结指数 四川盆地 

分 类 号：P631.8[天文地球—地质矿产勘探]