川西洛带气田蓬莱镇组气藏储层含气性识别与气水差异分辨  

GAS-BEARING RESERVOIR IDENTIFICATION AND GAS-WATER DIFFERENCE DISTINGUISHING OF PENGLAIZHEN FORMATION GAS RESERVOIR IN LUODAI FIELD IN WEST SICHUAN

作　　者：陈必孝[1] 徐炳高[1] 

机构地区：[1]中国石化集团新星公司西南石油局测井公司

出　　处：《天然气工业》2002年第2期27-30,共4页Natural Gas Industry

摘　　要：洛带气田蓬莱镇组气藏含流体测井响应较复杂 ,首先表现在储层含气性测井响应纵向变化大 ,随着埋深的增大 ,声波时差降低 ,密度增大 ,中子孔隙度减小 ,变化幅度非常大 ;其次 ,储层普遍低阻 ,测试发现较多的低阻储层产气 ,不出水 ,而高阻储层产水现象却时有出现。这些特点导致含气性识别与气水差异分辨难度较大。文章在充分利用测试成果的基础上 ,以测试的储层类别作为标准样本 ,通过与测井曲线间关系的研究 ,寻找出能表征不同含气级别的测井信息 ,以此建立起储层含气 (水 )识别模式。对于含气性识别 ,充分考虑了埋深对含气响应的影响 ,将不同埋深储层的孔隙度曲线值校正到同一深度 ,然后以测试结果为依据 ,确定不同含气级别的测井值域。对于气水差异识别 ,把对水反映较敏感的电阻率与中子孔隙度曲线进行一定校正和含水信息的放大处理 ,建立气水识别指标 ,然后用测试结果对指标进行气水差异的标定。综合含气性识别与气水差异分辨结果对储层含流体性质及丰度进行判别 ,识别出气层、水层、含水气层、含气层等储层类型。利用测试结果对模型的判别结果进行了检验 ,符合率较高 ,达 90 %以上 ,判别效果好。The log response of the fluids contained in Penglaizhen Formation gas reservoir in Luodai field is relatively complicated.First,the vertical change in gas-bearing logging response of reservoir is large and along with burial depth increase,sonic interval transit time log decreases,density log increases and neutron porosity log reduces,their change amplitudes being very large;and second,the resistivities of the reservoir are commonly low and through testing it was found that natural gas was produced in the reservoir with low resistivities,no water being carried over,and the phenomenon of producing water in the reservoir with high resistivities occurred commonly.All of these cause the gas-bearing reservoir to be difficultly identified and the gas-water difference to be difficultly distinguished.On the basis of fully applying test results and by taking the tested reservoir categories as the standard sample,a gas- and/or water-bearing reservoir identification model was established through studying the relation among various logs to look for the log information characteristics of different gas-bearing grades.In order to identify the gas-bearing reservoirs,the influence of burial depth on log response of gas-bearing reservoir was fully considered to correct the porosity curve values at different burial depths to the same depth,then the logging-value ranges of various gas-bearing grades might be determined on the basis of the tested results.In order to distinguish the gas-water difference,through correcting the resistivity and neutron porosity logs sensitive to water layers to a certain extent and multiplying the water-bearing information,the gas-water identification indexes might be established,then the calibration of gas-water difference was carried out for the indexes on the basis of tested results.In light of identifying fluid properties in reservoir and their abundances according to the results of gas-bearing reservoir identification and gas-water difference distinguishing,different reservoir categories,such as gas

关 键 词：川西洛带气田 蓬莱镇组 含气性识别 四川盆地 油气藏 测井参数 储集层 油气水层识别 

分 类 号：P618.13[天文地球—矿床学] TE12[天文地球—地质学]