基于岩石物理相的复杂砂岩储层分类评价——以珠江口盆地惠州凹陷为例  

Complex sandstone reservoirs evaluation based on petrophysical facies classification:a case study of Huizhou Sag in the Pearl River Mouth Basin

作　　者：刘君毅 王清辉 冯进 管耀 杨清 Liu Junyi;Wang Qinghui;Feng Jin;Guan Yao;Yang Qing(Shenzhen Branch of CNOOC(China)Co.,Ltd.)

机构地区：[1]中海石油(中国)有限公司深圳分公司,518000

出　　处：《中国石油勘探》2021年第2期92-102,共11页China Petroleum Exploration

基　　金：国家科技重大专项“南海东部海域勘探新领域及关键技术”(2016ZX05024-004)。

摘　　要：珠江口盆地惠州凹陷珠江组和珠海组沉积时期,由于母岩类型和沉积环境等因素的影响,目的层发育多种类型中低渗砂岩储层,不同类型砂岩储层的孔隙结构、渗流性能和岩电规律差异显著,传统分区分层位建模的方法存在模型选择针对性不强、解释精度偏低等生产难题。为提高储层参数解释精度,文章从岩石物理相分类入手,基于岩心资料优选粒度均值、矿物含量、孔隙度、渗透率和孔隙结构特征参数表征储层的岩石物理特征,将储层分为长石石英中—细砂岩相、含黏土长石石英细砂岩相、含黏土长石石英粉砂岩相及钙质石英中—细砂岩相4类岩石物理相。进一步根据不同岩石物理相的测井响应特征提取敏感曲线,用判别分析方法建立不同类型岩石物理相的测井识别标准。在此基础上,利用实验数据刻度建立每一类岩石物理相的储层参数精细解释模型。实际应用效果表明,基于岩石物理相分类的方法,孔隙度、渗透率及含水饱和度的计算精度较传统方法得到明显提高,满足储量计算的要求,新井的测井解释结论与DST测试结果吻合良好。During the deposition period of Zhujiang and Zhuhai Formations in Huizhou Sag of the Pearl River Mouth Basin,several types of low and medium permeability sandstone reservoirs were developed in the target layer due to the influence of mother rock types and sedimentary environment.The pore structure,flow capacity and rock electricity law are significantly different of different types of reservoir.The traditional zoning and layered modeling method has application problems such as poor pertinence of selected model and low interpretation accuracy.In order to improve the interpretation accuracy of reservoir parameters,this paper starts with the reservoir classification by petrophysical facies.Based on the core data,parameters of the average grain size,mineral content,porosity,permeability and pore structure are optimally selected to characterize the reservoir petrophysical properties.The reservoir is accordingly divided into four petrophysical facies:feldspar quartz medium-fine sandstone facies,clayey feldspar quartz fine sandstone facies,clayey feldspar quartz siltstone facies and calcareous quartz medium-fine sandstone facies.Furthermore,sensitive log curves are extracted according to the logging response characteristics of different petrophysical facies,and the logging identification criteria for different types of petrophysical facies are established using discriminant analysis method.On this basis,the fine interpretation model of reservoir parameters for each type of petrophysical facies is established and calibrated by experimental data.The practical application results show that the calculation accuracy of porosity,permeability and water saturation based on the method of petrophysical facies classification is significantly improved compared with the traditional method,which meets the requirements of reserves calculation,and the logging interpretation conclusion is in good agreement with the DST test result for new wells.

关 键 词：岩石物理相 储层参数 解释模型 惠州凹陷 珠江组 珠海组 

分 类 号：P631.84[天文地球—地质矿产勘探]