基于随钻成像测井天然裂缝有效性表征方法研究  

Study on natural fracture effectiveness characterization method based on imaging while drilling logging

作　　者：赵涵彬 刘红岐 刘诗琼[1] 崔云江 汪瑞宏 陈东 李建龙 廖海博 廖启明 朱猛 ZHAO HanBin;LIU HongQi;LIU ShiQiong;CUI YunJiang;WANG RuiHong;CHEN Dong;LI JianLong;LIAO HaiBo;LIAO QiMing;ZHU Meng(Southwest Petroleum University,Chengdu 610500,China;Cnooc Tianjin Branch,Tianjin 300452,China;CNPC Chuanqing Drilling Engineering Company,Guanghan 618300,China)

机构地区：[1]西南石油大学,成都610500 [2]中海石油(中国)有限公司天津分公司,天津300452 [3]中石油川庆钻探公司,广汉618300

出　　处：《地球物理学进展》2023年第6期2652-2662,共11页Progress in Geophysics

基　　金：中国石油-西南石油大学创新联合体(2020CX040203);国家自然科学基金(41974117)联合资助。

摘　　要：裂缝网络有效性极大地影响着天然裂缝性气藏的生产潜力,对其进行定量评估一直是储集层裂缝解释中的难题.以BZ19-A区凝析气田变质岩潜山储层为例,基于用随钻成像测井资料识别出高导缝,再结合常规测井电阻率曲线,综合构建了表征裂缝网络有效性的新因子—裂缝网络有效性因子Efi.该因子的构建,首先利用随钻成像测井资料识别出高导缝,然后选定裂缝对应的深、浅电阻率,并计算出裂缝密度Zi、裂缝张开度Ai、裂缝孔隙度φi和裂缝渗透率Kfi,最后通过裂缝网络有效性因子Efi对裂缝网络的有效性进行评价.为进一步验证该因子的合理性,用Heterogeneity Cutoff分析方法对随钻成像资料进行分析,识别出高导缝中的开启缝;同时,将计算得到的裂缝网络有效性因子Efi与开启缝相结合,和现场测试资料进行综合对比分析.结果表明:该方法计算的裂缝网络有效性因子Efi能够对裂缝的有效性进行定量评估,即裂缝有效性越好,Efi越大.The effectiveness of fracture network greatly affects the production potential of natural fractured gas reservoirs,and its quantitative evaluation is always a difficult problem in reservoir fracture interpretation.Taking the metamorphic buried hill reservoir of condensate gas field in BZ19A area as an example,based on the identification of high conductivity fractures by using imaging while drilling logging data,combined with the conventional logging resistivity curve,a new fracture network effectiveness factor Efi was synthesized to characterize the effectiveness of fracture network.To construct this factor,the high conductivity fractures are first identified using the imaging logging data while drilling,then the corresponding depth and shallow resistivity of the fractures are selected,and the fracture density Zi,fracture opening Ai,fracture porosityφi and fracture permeability Kfi are calculated.Finally,the fracture network effectiveness factor Efi is used to evaluate the effectiveness of the fracture network.In order to further verify the Heterogeneity Cutoff analysis method,the heterogeneity cutoff analysis method was used to analyze the open fractures in the high pilot well BZ193 in the Bohai Sea.At the same time,the calculated fracture network effectiveness factor Efi was combined with the open fracture,and the field test data were comprehensively analyzed.The results show that the fracture network effectiveness factor Efi calculated by this method can quantitatively evaluate the fracture effectiveness,that is,the better the fracture effectiveness is,the larger the Efi is.

关 键 词：变质岩潜山裂缝地层 随钻成像测井 阵列侧向电阻率 裂缝有效性 

分 类 号：P631[天文地球—地质矿产勘探]