川中地区沙溪庙组致密砂岩含气性测井评价技术  

Gas-Bearing Properties Log Evaluation Technique for Tight Sandstone of Shaximiao Formation in the Central Region of Sichuan Basin

作　　者：王跃祥 牟瑜 谢冰 赖强 赵佐安 夏小勇 WANG Yuexiang;MU Yu;XIE Bing;LAI Qiang;ZHAO Zuoan;XIA Xiaoyong(Exploration and Development Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China;Geological Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China;Engineering and Technical Department,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]中国石油集团测井有限公司地质研究院,陕西西安710077 [3]中国石油天然气集团有限公司测井重点实验室,陕西西安710077 [4]中国石油西南油气田公司工程技术处,四川成都610041

出　　处：《测井技术》2023年第1期42-47,共6页Well Logging Technology

基　　金：中国石油集团测井有限公司科学研究与技术开发项目课题“解释评价共性技术集成优化与软件模块挂接”(CNLC2022-08B05)。

摘　　要：四川盆地川中地区沙溪庙组砂体具有延伸范围大、纵向发育多的特征,展示出良好的致密气勘探潜力。测井技术在区域油气勘探开发的全过程发挥着重要的作用。由于纵向含气砂组较多、岩性多样、孔隙结构复杂、地层压力低,导致测井响应特征复杂;且单一的常规测井对储层含气性评价的局限性较大,储层实际情况与试气结果矛盾,储层气层识别技术有待进一步完善。重点针对沙二段4、6、7、8号主力含气砂组,在储层特征分析的基础上,开展气层测井响应敏感性研究,通过构建常规三孔隙度曲线差值、阵列声波高灵敏度组合流体识别因子、气测指标等多项识别参数,建立了多方法结合的致密砂岩含气性综合判识技术与解释标准。该技术的使用提高了测井解释符合率,为区域单井试气选层、拓展气藏认识提供支撑。The sand bodies of Shaximiao formation in the central region of Sichuan basin are characterized by extensive extension range and well longitudinal development,which shows good exploration potential for tight gas.Logging technology plays an important role in the whole process of regional nature gas exploration and development.The logging response characteristics are complicated due to many longitudinal gas-bearing sand groups,various lithology,complex pore structure and low formation pressure.The single conventional logging has certain limitations on reservoir gas-bearing properties evaluation,the actual reservoir conditions is in contradiction with the gas test results,and the gas layer identification technology needs to be further improved.We focuse on the main gas-bearing sand formation No.4,6,7 and 8 of the second member of Shaximiao formation in this paper.Based on the analysis of reservoir characteristics,the sensitivity of gas reservoir logging response is studied.By constructing conventional three-porosity curves difference value,highly sensitive array acoustic combination fluid identification factor,gas logging indicator and other multiple identification parameters,a multi-method synthetical gas layer identification technique and interpretation standard for tight sandstone are established.The coincidence rate of log interpretation is improved by using this technology,and it provides technical support for regional single well gas testing and layer selection and expanding understanding of gas reservoir.

关 键 词：测井评价 沙溪庙组 致密砂岩气 气层识别 敏感参数 三孔隙度差值 波阻抗差异 气测 

分 类 号：P631.84[天文地球—地质矿产勘探]