陕北斜坡东部致密油藏储层定量化分类的探讨——以GT区长4+5油层组为例  

Discussion on Quantitative Classification of the Tight Reservoirs in Eastern North Shaanxi Slope——A Case Study of Chang 4+5 Oil Reservoirs in GT Area

作　　者：赵博楠[1] 李艳霞[1] 张蓬勃[1] Zhao Bonan Li Yanxia Zhang Pengbo(School of Earth Sciences and Engineering,Xi＇an Shiyou University ,Xi＇an Shaanxi 710065)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《中外能源》2017年第2期26-32,共7页Sino-Global Energy

基　　金：陕西省自然科学基金项目"连续型油藏砂岩输导体系与石油运移时效性探讨"(编号:2013JM5006)资助

摘　　要：铸体薄片、扫描电镜等实验结果显示,陕北斜坡东部GT区长4+5储层以灰绿色长石砂岩为主,填隙物有铁方解石、绿泥石、硅质、长石质等,属于低孔、低渗、特低渗致密储集层。基于高压压汞实验,利用相关性分析法对物性参数进行讨论,提取其敏感型参数:排驱压力、分选系数、均值系数。利用多元线性回归求出储层与各敏感参数的主要指标回归检验,以乘积法建立上述三项主因参数综合指标——"敏感参数",然后根据数据构型原理进行分级确定,将研究区储层分为4类:Ⅰ类、Ⅱ类储层微观孔隙结构好,储集、渗流能力强,为有利储层,其在目的层中所占比例较小;Ⅲ类储层主要以晶间孔为主,当伴有裂缝或面孔率较小的溶蚀孔,且达到储层物性下限时,同样具备一定产能,其在目的层所占比例较大;Ⅳ类储层无产能。该研究成果可为该区后期储层评价、开发设计等提供指导。Experiment results of casting sections observing and scanning electron microscope show that Chang 4＋5 reservoirs in GT area of eastern north Shaanxi slope are the tight one with low porosity,low-extra low permeability,whose lithology is grey-green arkose mainly filled with ferrocalcite,chlorite,silicalite,feldspathic and so on.Physical property parameters were analyzed using correlation analysis based on high-pressure mercury intrusion experiments.Sensitive parameters were known as displacement pressure,sorting coefficient and coefficient of mean value.Multivariable linear regression was applied to the calculation of main index regres-sion testing of reservoir and sensitivity parameters.Product method was used to set comprehensive index of the above three main parameters,that is the sensitive parameters.And then the reservoirs can be divided into four types according to the data configuration principle.The microscopic pore structure of type Ⅰ and Ⅱ reservoirs is preferable and the condition of reservoir and seepage is the best among the four types of the study area.But the percentage of those two types in target reservoirs is low.Taking higher percentage in the target reser-voirs,type Ⅲ reservoir,mainly intercrystalline pores,will also have a certain capacity of oil production when value of porosity-permeability reach the low limit and there are fractures and corrosion pore with low face porosity are around.And there is no productivity of Type Ⅳ.The achievements of this paper may provide guidance for reservoir evaluation and development design in later stage of the studied area.

关 键 词：陕北斜坡东部 致密油藏储层 储层特征 敏感参数 储层分类 

分 类 号：P618.13[天文地球—矿床学]