靖边气田中区上古生界山^(3)2-盒_(8)段储层气水特征及含气性研究  

Study on gas-water characteristics and gas-bearing properties of Upper Paleozoic Shan32-He8 member reservoir in middle area of Jingbian Gas Field

作　　者：陈兴官[1] 张子为[1] 陈楠[1] 张延斌[1] 孟子昂 张小莉[2] 李亚军 钟高润 CHENG XingGuan;ZHANG ZiWei;CHEN Nan;ZHANG YanBin;MENG ZiAng;ZHANG XiaoLi;LI YaJun;ZHONG GaoRun(No.1 Gas Production Plant,PetroChina Changqing Oilfield Company,Jingbian 718500,China;Department of Geology,Northwestern University,Carbon Neutrality College(Yulin),Northwest University,National and Local Joint Engineering Research Center of Carbon Capture and Sequestration Technology,Shaanxi Key Laboratory for Carbon Neutral Technology,Xi'an 710069,China;School of Petroleum Engineering and Environmental Engineering,Yan'an University,Yan'an 716000,China)

机构地区：[1]中国石油长庆油田分公司第一采气厂,靖边718500 [2]西北大学地质学系,西北大学碳中和学院,二氧化碳捕集与封存国家地方联合工程研究中心,陕西省碳中和技术重点实验室,西安710069 [3]延安大学石油工程与环境工程学院,延安716000

出　　处：《地球物理学进展》2025年第1期176-187,共12页Progress in Geophysics

基　　金：陕西省自然科学基础研究计划项目(2022JC-DW-09)资助.

摘　　要：为明确鄂尔多斯盆地苏里格东南部盒_(8)段气水层核磁共振特征和含气性影响因素,利用二位核磁共振技术表征气水层特征,结合地层水、储层物性、地层各向异性、气源供给分析结果,明确了研究区盒_(8)段气水层核磁共振响应特征,分析了地层水、孔隙类型、孔喉结构、地层各向异性、气源供给与储层含气性的关系.结果表明:①地层水类型主要为CaCl2型,但矿化度差异性较强,分布于3669~325000 mg/L,水型全部为CaCl2,pH值为4.21~8.98,呈弱酸性,钠氯比[r(Na+)/r(Cl-)]均小于0.61、氯镁系数[r(Cl-)/r(Mg 2+)]均大于7.0、镁钙系数[r(Mg 2+)/r(Ca 2+)]均小于0.69、变质系数[r(Cl--Na+)/r(Mg 2+)]均大于0.47,说明地层水处于较停滞的还原状态,地层封闭性强,天然气保存良好;②盒_(8)段气水层分布关系复杂,二维核磁共振技术能有效区分气水层;③盒_(8)段储层孔隙类型以残余粒间孔和长石溶蚀孔为主,孔隙度为2.70%~14.48%,渗透率为(0.04~15.92)×10-2μm-2,储层物性影响储层含气性,气层孔隙度、渗透率分别大于7.0%、0.2×10-2μm-2,含气层和差气层的孔隙度、渗透率分别介于5%~9.5%、(0.02~0.7)×10-2μm-2,干层对应的孔隙度、渗透率分别小于5%、0.1×10-2μm-2;气层各向异性介于15%~20%,干层各向异性小于6%.In order to clarify the Nuclear Magnetic Resonance(NMR)characteristics and influencing factors of gas-water layer of He8 member in southeast Sulige of Ordos Basin,two-dimensional NMR technology was used to characterize the gas-water layer characteristics,combined with the analysis results of formation water,reservoir physical properties,formation anisotropy and gas supply,the NMR response characteristics of the gas-water layer of He8 member in the study area were clarified.The relationship between formation water,pore type,pore throat structure,formation anisotropy,gas supply and reservoir gas bearing is analyzed.The results show that:①The formation water in the study area is mainly CaCl2 type,but the salinity difference is strong,and the distribution is 3669~325000 mg/L.The water type is all CaCl2,the pH value is 4.21~8.98,and it is weakly acidic.[r(Na+)/r(Cl-)]was less than 0.61,the coefficient of chloride to magnesium[r(Cl-)/r(Mg 2+)]was greater than 7.0,and the coefficient of magnesium to calcium[r(Mg 2+)/r(Both Ca 2+)]are less than 0.69,and the metamorphic coefficients[r(Cl--Na+)/r(Mg 2+)]are more than 0.47,indicating that the formation water is in a relatively stagnant reduction state,the formation is strongly sealed,and the natural gas is well preserved.②The distribution of gas-water layers in He8 member in the study area is complex,and two-dimensional nuclear magnetic resonance technology can effectively distinguish the gas-water layers.③The pore types of the reservoir in He8 member are mainly residual intergranular pores and feldspar solution pores,with porosity ranging from 2.70%to 14.48%and permeability ranging from 0.04 to 15.92×10-3μm2.The reservoir physical properties affect the gas bearing properties of the reservoir,and the porosity and permeability of the reservoir are greater than 7.0%and 0.2×10-3μm2,respectively.The porosity and permeability of the gas-bearing and differential gas layers are 5%~9.5%and(0.02~0.7)×10-3μm2,respectively,while the porosity and permeability of the dry lay

关 键 词：气水层 盒_(8)段 核磁共振 含气性 各向异性 

分 类 号：P631[天文地球—地质矿产勘探]