油基钻井液条件下裂缝声波测井评价方法——以塔里木盆地库车坳陷克深地区致密砂岩储集层为例

发布时间：2018-05-04 15:20

本文选题：致密砂岩储集层 + 裂缝评价　；参考：《石油勘探与开发》2017年03期

【摘要】：为解决油基钻井液井依据流体导电原理的测井裂缝识别效果变差难题,分别从斯通利波、纵横波以及交叉偶极子声波等3方面拓展了声波测井在裂缝定量刻画中的应用,并考虑裂缝径向延伸特性,建立了与产能关系密切的裂缝测井评价模式。利用斯通利波反射系数确定裂缝位置,可弥补常规微电阻率成像测井过程中裂缝的漏拾。考虑孔隙度影响,根据裂缝宽度-声波衰减系数测量实验,建立了依据纵、横波能量信息计算裂缝宽度的经验公式。利用交叉偶极子阵列声波测井处理得到的频率谱相关系数、能量差值可进行裂缝评价:地层裂缝越发育,能量差值越大,谱相关系数越小,产量也越高。裂缝有效性评价参数分为表征垂向张开特性与径向延伸特性的两大类参数,依据常规测井与阵列声波测井(包括交叉偶极子测井)提取的裂缝特征参数组合,建立了与产能关系密切的裂缝径向延伸评价模式。
[Abstract]:In order to solve the problem of fracture identification in oil-base drilling fluid wells based on fluid conductivity principle, the application of acoustic logging in fracture quantitative characterization is extended from three aspects, Stonley wave, longitudinal and shear wave and cross dipole acoustic wave, respectively. Considering the radial extension of fracture, a fracture logging evaluation model with close relation to productivity is established. The location of fractures can be determined by using the reflection coefficient of Stoneley wave, which can make up for the leakage of fractures in conventional microresistivity imaging logging. Considering the effect of porosity, an empirical formula for calculating fracture width based on the information of longitudinal and shear wave energy is established according to the experiment of measuring fracture width and acoustic attenuation coefficient. The frequency spectrum correlation coefficient obtained by cross dipole array acoustic logging can be used to evaluate the fracture: the more developed the formation fracture, the greater the energy difference, the smaller the spectral correlation coefficient, the higher the production. Fracture validity evaluation parameters can be divided into two categories: vertical opening characteristics and radial extension characteristics. The fracture characteristic parameters extracted from conventional logging and array acoustic logging (including cross dipole logging) are combined. The evaluation model of radial extension of fracture is established, which is closely related to productivity.
【作者单位】：长江大学地球物理与石油资源学院;中国石油塔里木油田公司勘探开发研究院;
【基金】：中国石油科技创新基金(2015D-5006-0305)
【分类号】：TE151;TE254

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