基于孔隙结构综合评价指数的致密砂岩储层分类方法  

Classification Method of Tight Sandstone Reservoir Based on Comprehensive Evaluation Index of Pore Structure

作　　者：周丽艳 罗少成 林伟川 单沙沙 周妍 马丽 ZHOU Liyan;LUO Shaocheng;LIN Weichuan;SHAN Shasha;ZHOU Yan;MA Li(Geological Research Institude,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,陕西西安710077 [2]中国石油天然气有限公司测井重点实验室,陕西西安710077

出　　处：《测井技术》2022年第6期707-713,共7页Well Logging Technology

基　　金：中国石油集团测井有限公司科学研究与技术开发项目“测井油藏与地质研究”(CNLC2022-8B05)。

摘　　要：致密砂岩储层具有孔隙度低、渗透率低、非均质性强、孔隙结构复杂的特点,对微观孔隙结构的研究是评价此类储层有效性的关键所在。以岩心压汞资料为基础,根据压汞曲线的分布形态及压汞特征参数评价储层微观孔隙结构。基于压汞特征参数与核磁共振实验T2几何平均值的关系,构建孔隙结构综合评价指数,并结合储层品质因子,实现致密砂岩储层评价,将储层分为3类。Ⅰ类储层品质最好,为高产储层;Ⅱ类储层为小孔细喉型致密储层,需压裂改造;Ⅲ类储层品质最差,为无效储层。利用该方法对实例井进行处理,并从孔隙度、渗透率、压汞特征参数和试油等方面进行综合效果验证,结果与建立的标准一致性较好。通过该方法可实现连续定量化的储层孔隙结构评价,快速判别储层类型,能有效提高优质储层识别精度。Tight sandstone reservoir is characterized by low porosity,low permeability,strong heterogeneity and complex pore structure.To evaluate the effectiveness of such reservoirs,the study of micro pore structure is the core.Based on core mercury injection data,we evaluates the micro pore structure of the reservoir according to the distribution of mercury injection curve and mercury injection characteristic parameters in this paper.Based on the relationship between mercury injection characteristic parameters and T2 geometric mean value of nuclear magnetic resonance experiment,a comprehensive evaluation index of pore structure is constructed.Combined with reservoir quality factor,the tight sandstone reservoir is evaluated,and the reservoirs can be divided into three types.Class I reservoir has the best quality and is a high-yield reservoir.ClassⅡreservoir is a tight reservoir with small pores and fine throats,which needs fracturing.ClassⅢreservoir has the worst quality and is invalid.The method is used to process the example wells,and the comprehensive effect is verified from the aspects of porosity and permeability,mercury injection characteristic parameters and oil testing,which is consistent with the established standard.Based on this method,continuous quantitative evaluation of reservoir pore structure can be realized,reservoir types can be quickly identified,and identification of high-quality reservoirs can be effectively improved.

关 键 词：致密砂岩 储层评价 孔隙结构 核磁共振 彭阳地区长8储层 

分 类 号：P631.84[天文地球—地质矿产勘探]