低渗-致密气藏有效储层发育主控因素分析  

Analysis of controlling factors for the development of low permeability-tight gas effective reservoirs

作　　者：霍磊 钟高润[2] 阎媛子[1] 张蔚红[1] 刘星 孔啸 HUO Lei;ZHONG Gaorun;YAN Yuanzi;ZHANG Weihong;LIU Xing;KONG Xiao(Shaanxi Energy Institute,Xianyang Shaanxi 712000,China;State Key Laboratory of Continental Dynamics,Northwest University/Department of Geology,Northwest University,Xi'an Shaanxi 710069,China)

机构地区：[1]陕西能源职业技术学院,陕西咸阳712000 [2]西北大学地质学系/西北大学大陆动力学国家重点实验室,陕西西安710069

出　　处：《石油化工应用》2023年第3期100-106,共7页Petrochemical Industry Application

基　　金：陕西省教育厅科学研究计划项目资助,项目编号:22JK0325。

摘　　要：通过显微镜下碎屑矿物的定量统计、阴极发光等方法确定了研究区的物源;结合岩心观察、薄片鉴定、物性分析及压汞资料,分析了砂岩类型、胶结物特征与储层物性的关系。研究表明:有效储层受沉积作用和成岩作用共同控制。沉积物源决定了储层岩石类型和骨架矿物特征,是有效储层形成的物质基础。水动力条件决定有效砂体的空间分布和叠置样式,高能条件下心滩或复合河道沉积中冲刷切割型叠置型的砂体是有效储层发育的主要部位。压实作用和胶结作用使砂岩致密化,中-粗粒石英砂岩中保存部分原生孔隙,较纯的石英砂岩易发生石英次生加大,降低了砂岩的孔隙度;自生黏土矿物可能会降低储层渗透率,但并不绝对,如凝灰质、伊利石或蒙脱石收缩形成的收缩缝能够改善储层的渗透性;溶蚀作用有效的改善储层物性,为建设性成岩作用。Detrital minerals under the microscope by quantitative statistics,cathodoluminescence and other methods to determine the provenance of the study area.Combined core observation,thin section analysis,physical analysis and mercury data analyze the relationship between the type of sandstone,cement characteristics and reservoir properties.Research shows that effective reservoir is controlled by sedimentation and diagenesis.The sediment source determines the type of reservoir rock and mineral characteristics of the skeleton and is the material basis of effective reservoir formation.Hydrodynamic conditions determine the spatial distribution of effective reservoir and stacked styles,high-energy conditions and complex cardiac beach erosion of river sediments and overlying sandstone cutting type is the major part of the effective reservoir development.Compaction and cementation make sandstone densifie,to the medium-coarse grade quartz grains mainly sandstone,save part of the original porosity,relatively pure quartz sandstone prone quartz overgrowth,reducing the porosity sandstones.Authigenic clay minerals may reduce reservoir permeability,but not absolute,such as tuffaceous,shrink illite or montmorillonite contraction joints formed to improve permeability reservoirs and to become the effective reservoir,dissolution is constructive diagenesis and improve reservoir property effectively.

关 键 词：有效储层 沉积作用 成岩作用 砂体叠置关系 盒8 

分 类 号：TE122.221[石油与天然气工程—油气勘探]