基于岩石物理分析的相控叠前反演技术在铝土岩储层预测中的应用——以鄂尔多斯盆地庆城井区为例  

Application of phase-controlled pre-stack inversion technique based on rock physics analysis in bauxite reservoir prediction:A case study of the Qingcheng district in the Ordos Basin

作　　者：佘钰蔚 张盟勃[1,2] 王永刚[1,2] 张瑶[2,3] 李斐 瞿长[1,2] 吴越 SHE Yuwei;ZHANG Mengbo;WANG Yonggang;ZHANG Yao;LI Fei;QU Chang;WU Yue(Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi’an 710018,China;National Engineering Laboratory of Exploration and Development of Low Permeability Oil and Gas Fields,Xi'an 710018,China;Exploration Division,Changqing Oilfield Company,PetroChina,Xi’an 710018,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油长庆油田分公司勘探事业部,陕西西安710018

出　　处：《天然气地球科学》2024年第8期1432-1440,共9页Natural Gas Geoscience

基　　金：中国石油集团重大专项“致密砂岩气藏提高采收率关键技术研究”(编号:2023ZZ25)资助.

摘　　要：铝土岩气藏局部富集,储层薄且变化快,顶底双强反射界面屏蔽作用强,地震有效储层定量预测难度大。从岩石物理分析入手,对比分析岩心测试、测井交会结果,首次明确了铝土岩岩性、含气性的敏感参数。在横波预测的基础上,采用相控叠前地质统计学反演刻画铝土岩储层的空间展布,解决了有效薄储层识别的难题。研究结果表明:①在岩石力学和超声波测试结果的基础上,提出岩性敏感因子R,定量评价出剪切阻抗是指示铝土岩岩性的敏感参数,该结论与测井交会分析结果一致;②饱和度测试和测井分析结果表明泊松比为指示铝土岩含气性的敏感参数;③相控叠前地质统计学反演结果验证表明剪切阻抗比纵波阻抗识别优质铝土岩更为敏感,泊松比可以较好地区分铝土岩干层和气层。反演结果与验证井吻合程度较高,并支撑了首口铝土岩水平井的实施,其优质储层钻遇率高,试气结果刷新了鄂尔多斯盆地上古生界的试气记录。The bauxite reservoir is locally enriched,the reservoir is thin and fast changing,and the double strong reflection interface of top and bottom has strong shielding effect,so the quantitative prediction of seismic effective reservoir is difficult.In this paper,the sensitive parameters of bauxite lithology and gas bearing are defined for the first time by comparing the results of core testing and logging.On the basis of shear wave prediction,the spatial distribution of bauxite reservoir is described by phase controlled pre-stack geostatistics inversion,which solves the difficult problem of effective thin reservoir identification.The results show that:(1)On the basis of rock mechanics and ultrasonic test results,the lithology sensitivity factor R is proposed.And it evaluated that shear impedance is a sensitive parameter indicating the lithology of bauxite rock.This conclusion is consistent with the result of logging intersection analysis.(2)The saturation test results show that Poisson's ratio is a sensitive parameter indicating the gas bearing property of bauxite rock.(3)The results of pre-stack geostatistical inversion show that shear impedance is more sensitive than p-wave impedance to identify high-quality bauxite rocks and Poisson's ratio can distinguish well between bauxite rock dry layer and gas layer.The inversion results are in good agreement with the verification wells,which helps the high drilling rate of the first bauxite horizontal well.The gas test results of this horizontal well refresh the record of Upper Paleozoic gas test in the Ordos Basin.

关 键 词：鄂尔多斯盆地 铝土岩气藏 岩石物理分析 叠前储层预测 

分 类 号：TE132.14[石油与天然气工程—油气勘探]