海拉尔盆地乌尔逊-贝尔凹陷南屯组砂岩储层物性界限与分级评价  

Physical property boundaries and grouping evaluation of sandstone reservoirs in Nantun Formation from Wuerxun-Beier sag,Hailar Basin

作　　者：刘丽娟[1] LIU Lijuan(Exploration and Development Research Institute,Daqing Oilfield Company Limited,Daqing 163712,Heilongjiang,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《世界地质》2023年第2期297-308,共12页World Geology

基　　金：中国石油天然气股份有限公司科技重大专项(2016EG0202)。

摘　　要：厘定常规储层-致密储层、致密储层-无效储层等重要物性界限和建立储层分级评价标准一直是国内外储层研究工作中不可或缺的内容。笔者以海拉尔盆地中部断陷带乌尔逊—贝尔凹陷南屯组砂岩储层为研究对象,综合运用力学平衡法、含油产状法、最小流动孔喉半径法等多种方法明确南屯组砂岩储层各类物性界限,其中常规储层-致密储层物性界限为孔隙度12%、渗透率1 mD,致密储层-无效储层物性界限为孔隙度4%、渗透率0.03 mD。结合孔渗、高压压汞、核磁共振等实验分析得到的储层内部结构表征参数,建立了储层分级评价标准,将南屯组砂岩储层划分为常规储层Ⅰ类(RQI≥1)、常规储层Ⅱ类(0.33≤RQI<1)、致密储层Ⅰ类(0.13≤RQI<0.33)、致密储层Ⅱ类(0.07≤RQI<0.13)和无效储层(RQI<0.07)5个类别,揭示了不同类型储层的宏观物性和微观孔隙结构特点,试油试采资料证实该储层分类方案与试油产液量具有较好的相关性。研究进一步明确了不同类型储层的适配试油工艺,常规储层Ⅰ类一般通过直井常规测试即可获得工业油流,常规储层Ⅱ类需开展一定规模的压裂工作后可获工业油流,致密储层Ⅰ类一般需直井大规模压裂可获工业油流,致密储层Ⅱ类需要通过水平井体积压裂改造。It has always been an indispensable research in reservoir research to determine the boundaries of key physical properties between conventional and tight,tight and ineffective reservoirs and establish the criteria of grouping evaluation,at home and abroad.Taking sandstone reservoirs of Nantun Formation in Wuerxun-Beier sag of Hailar Basin as an example,the key physical property boundaries of the sandstone reservoirs of Nantun Formation are determined by comprehensive application of mechanical balance,oil-bearing occurrence,minimum flow pore throat radius and other methods.It has been recognized that the porosity of 12%and permeability of 1 mD constitute the boundary between conventional and tight reservoirs,with 4%porosity and 0.03 mD permeability being that between tight and ineffective reservoirs.Based on the study above,the criteria of reservoir grouping evaluation were established by the internal structure characterization parameters of the reservoir obtained by high pressure Hg injection,NMR and other experimental analysis.The sandstone reservoirs of the Nantun Formation are divided into five categories:conventional typeⅠ(RQI≥1),conventional typeⅡ(0.33≤RQI<1),tight typeⅠ,(0.13≤RQI<0.33)tight typeⅡ(0.07≤RQI<0.13),and ineffective type(RQI<0.07),which reveal the macroscopic physical properties and microscopic pore structure characteristics of different reservoir types.The oil test and production data confirm that the reservoir grouping scheme has a good correlation with production in oil test.Furthermore,it is clarified the adaptation testing technology of different types of reservoirs as follows.For conventional reservoir type I,industrial oil flow can be obtained by vertical wells routine testing.For conventional reservoir typeⅡ,industrial oil flow requires a certain scale of fracturing.For tight reservoir typeⅠ,industrial oil flow generally requires vertical well with large-scale fracturing.For tight reservoir typeⅡ,industrial oil flow can be achieved by horizontal well with volume fract

关 键 词：海拉尔盆地 乌尔逊—贝尔凹陷 南屯组 砂岩储层 物性界限 

分 类 号：P618.13[天文地球—矿床学]