基于相控岩性约束的隐蔽致密砂岩储层预测技术  

Prediction technology of concealed tight sandstone reservoir based on phase-controlled lithology constraint

作　　者：王勇[1] 贾秀容[2] 朱颜[2] 岳欣欣[2] 李晓明[2] 李伟才[2] WANG Yong;JIA Xiurong;ZHU Yan;YUE Xinxin;LI Xiaoming;LI Weicai(Henan Oilfield Company,SINOPEC,Nanyang 473132,China;Exploration and Development Research Institute,Henan Oilfield Company,SINOPEC,Nanyang 473132,China)

机构地区：[1]中国石化河南油田分公司,河南南阳473132 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《断块油气田》2024年第6期992-997,共6页Fault-Block Oil & Gas Field

基　　金：中国石油化工股份有限公司重点科技攻关项目“致密碎屑岩优质储层地震预测技术应用研究”(YT24005)。

摘　　要：鄂尔多斯盆地南缘延长组为辫状河三角洲-湖泊沉积体系。针对长3段水下分流河道致密砂岩优质储层与泥岩波阻抗难以区分、地震响应特征不明显、储层预测难度大的问题,文中通过不同沉积微相带储层的测井响应特征研究,采用“砂中找优”递进式思路,提出了一套基于相控的岩性约束隐蔽致密砂岩储层预测技术。该技术采用自适应神经网络算法波形聚类沉积微相分析、地质统计学岩性反演砂岩识别描述、围岩过滤的砂岩波阻抗储层定量表征的方法组合,解决了应用地震波形结构特征及振幅属性优化等方法识别河道砂体存在的多解性问题,实现了隐蔽致密砂岩优质储层甜点目标的刻画。该方法在鄂南地区延长组长3段的评价勘探应用中取得了成功,对于同类型介于致密砂岩和常规砂岩之间的隐蔽岩性油藏的储层识别描述具有借鉴和指导意义。The Yanchang Formation in the southern margin of Ordos Basin is a braided river delta to lake sedimentary system.It is difficult to distinguish the wave impedance between the high quality tight sandstone reservoir and mudstone in the underwater distributary channel of Chang 3 Member,the seismic response characteristics are not obvious,and the reservoir prediction is difficult.Based on the study of logging response characteristics of different sedimentary microfacies reservoirs and the progressive idea of"finding the best in sand",a set of phase-controlled lithology constrained concealed tight sandstone reservoir prediction technology is proposed.The technology uses a combination of self-adaptation neural network algorithm waveform clustering sedimentary microfacies analysis,geostatistics lithology inversion characterization of sand body development area,and quantitative characterization of sandstone wave impedance reservoir by surrounding rock filtration to solve the problem of multiple solutions in identification of channel sand bodies by using seismic waveform structure characteristic method and amplitude attribute optimization.The sweet spot target of concealed tight sandstone reservoir is described.This method has been successfully applied in the evaluation and exploration of Chang 3 Member in Yanchang Formation of southern Hubei Province,and has reference and guiding significance for reservoir identification and description of concealed lithologic reservoirs with similar properties between tight sandstone and conventional sandstone.

关 键 词：相控 岩性约束 储层预测 延长组 鄂尔多斯 

分 类 号：TE121[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]