致密砂岩裂缝填充识别及其测井响应特征——以鄂尔多斯盆地镇泾油田延长组为例  

Fracture Filling Identification and Logging Response Characteristics of Tight Sandstone: A Case Study of Yanchang Formation inZhenjing Oilfield, Ordos Basin

作　　者：苏可嘉 秦臻 邓呈祥 刘文辉 刘亮 张晓峰 SU Ke-jia;QIN Zhen;DENG Cheng-xiang;LIU Wen-hui;LIU Liang;ZHANG Xiao-feng(East China Institute of Technology,School of Geophysics and Measurement and Control Technology,Nanchang 330013,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu 610059,China;China University of Geosciences Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,Wuhan 430074,China;North China University of Water Resources and Electric Power,College of Geosciences and Engineering,Zhengzhou 450046,China;Shanxi Institute of Engineering and Technology,Department of Geology and Environmental Engineering,Yangquan 045000,China)

机构地区：[1]东华理工大学地球物理与测控技术学院,南昌330013 [2]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [3]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [4]华北水利水电大学地球科学与工程学院,郑州450046 [5]山西工程技术学院地质与环境工程系,阳泉045000

出　　处：《科学技术与工程》2022年第21期9095-9104,共10页Science Technology and Engineering

基　　金：国家自然科学基金(41804097);油气藏地质及开发工程国家重点实验室(成都理工大学)开放基金(PLC20180701);核技术应用教育部工程研究中心开放基金(HJSJYB2017-3);江西省教育厅科学技术研究项目(GJJ170482);“构造与油气资源”教育部重点实验室(中国地质大学(武汉))开放基金课题(TPR-2020-04);东华理工大学教学改革研究课题(DHJG-20-13);东华理工大学博士科研启动基金(DHBK2017109)。

摘　　要：鄂尔多斯盆地镇泾油田延长组发育致密砂岩裂缝,准确识别裂缝的填充程度有助于更好地评价和开发致密砂岩储层。运用延长组的岩心资料、成像测井资料和常规测井资料,统计裂缝的产状、填充矿物和填充情况,确定研究区裂缝主要岩性为细砂岩和粉砂岩,主要填充物为方解石,通过交会图和正态分布,总结了有填充裂缝和未填充裂缝的测井响应特征,对比了有填充裂缝和未填充裂缝的测井响应差异,选取裂缝敏感的测井参数,构建曲线变化幅度参数和曲线变化率参数,进而构建裂缝有未填充的综合指数识别方法。结果显示,感应测井对裂缝有填充和未填充响应有明显差异,孔隙度测井对裂缝有填充和未填充有一定的响应差异,岩性测井响应差异最不明显。将响应特征和识别方法应用于研究区2口井,对裂缝有未填充的综合识别率达76%。结果表明该响应特征和识别方法可为致密砂岩裂缝填充评价提供新思路,完善裂缝致密砂岩储层的评价方法。The fractures in the Yanchang Formation of the Zhenjing oilfield in the Ordos Basin are dense sandstone fractures,and accurate identification of the fracture infill can help to better evaluate and develop the dense sandstone reservoir.Using core data,imaging logging data and conventional logging data of the Yanchang Formation,the fracture production,filling minerals and filling conditions were counted,and the main lithologies of the fractures were determined to be fine sandstone and siltstone,with calcite as the main filler.The logging response characteristics of filled and unfilled fractures were summarized by means of rendezvous plots and normal distributions,and the logging response differences between filled and unfilled fractures were compared to select fracture-sensitive logging parameters,constructing the curve change amplitude parameter and curve change rate parameter,and then constructing a comprehensive index identification method for fractures with and without filling.The results show that there is a significant difference between the response of induction logs to fracture filled and unfilled,some difference in the response of porosity logs to fracture filled and unfilled,and the least significant difference in the response of lithology logs.The response characteristics and identification method was applied to two wells,and the combined identification rate of fractured and unfilled wells was 76%.The results show that the response characteristics and identification method can provide new ideas for fracture filling evaluation in dense sandstones and improve the evaluation method for fractured dense sandstone reservoirs.

关 键 词：致密砂岩 裂缝填充程度 地球物理测井 测井响应 镇泾油田 

分 类 号：TE122[石油与天然气工程—油气勘探]