致密砂岩气藏孔渗结构下限及对气水分布的影响——以苏里格气田苏48和苏120区块储层为例

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英文篇名：Lower limit of porosity-permeability structure of tight sandstone gas reservoir and its influence on gas-water distribution——Taking Su 48 and Su 120 blocks in Sulige gas field as examples 作者：赵丁丁 ; 孙卫 ; 雒斌 ; 吴育平 ; 李冠男 英文作者：ZHAO Dingding;SUN Wei;LUO Bin;WU Yuping;LI Guannan;State Key Laboratory for Continental Dynamics, Department of Geology, Northwest University; 关键词：苏里格气田 ; 致密砂岩储层 ; 孔渗结构 ; 气水可动孔喉下限 英文关键词：Sulige gas field;;tight sandstone reservoir;;pore-permeability structure;;movable gas and water;;lower limit of pore-throat structure 中文刊名：SYHN 英文刊名：Petroleum Geology and Engineering 机构：西北大学地质学系大陆动力学国家重点实验室; 出版日期：2019-05-25 出版单位：石油地质与工程 年：2019 期：v.33 语种：中文; 页：SYHN201903018 页数：6 CN：03 ISSN：41-1388/TE 分类号：80-85

摘要

苏里格气田是典型的致密砂岩气藏,其气水分布特征复杂,对产能的影响较大。应用铸体薄片、高压压汞、相渗等多种实验测试资料,分析了研究区的孔喉结构下限及对气水分布的影响。研究结果表明,苏48区块孔隙类型主要发育岩屑溶孔、粒间孔和晶间孔,苏120区块孔隙类型以岩屑溶孔、晶间孔为主;研究区气水的可动孔喉下限为0.003 8μm,水膜厚度为0.002μm,毛细管水影响的孔喉半径区间为0.003 8～0.050 0μm;气水分布特征在宏观上主要受岩性控制,在微观上受孔喉分布的影响;储层孔渗特征对气水分布的影响较为复杂。
        Sulige gas field is a typical tight sandstone gas reservoir. The gas and water distribution characteristics are quite complicated, which have a great impact on productivity in the process of gas reservoir development. The lower limit of pore-throat structure and its influence on gas-water distribution in the study area were analyzed by using the experimental data of casting thin section, high pressure mercury injection and phase permeation. The results show that the fractured pores, intergranular pores and inter-crystalline pores of cuttings are mainly developed in Su 48 block. The pore types in Su120 block are mainly of karst and inter-crystalline. In the study area, the lower limit of movable hole throat is 0.0038μm,the thickness of water film is 0.002μm, and the pore throat radius range affected by capillary water is0.0038～0.0500μm. The characteristics of gas-water distribution are mainly controlled by lithology in macroscopic view, and affected by pore-throat distribution microscopically. The influence of reservoir porosity and permeability on gas-water distribution is complicated.

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