基于岩石物理相约束的致密砂岩气储层渗透率解释建模  

A fine logging interpretation model of permeability confined by petrophysical facies of tight gas sandstone reservoirs

作　　者：赖锦[1] 王贵文[1] 罗官幸 黄龙兴 赵显令[1] 李洪楠[1] 李梅[1] 王迪[1] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油新疆油田公司克拉玛依采油二厂,克拉玛依834000 [3]中石油测井有限公司国际事业部,北京102206

出　　处：《地球物理学进展》2014年第3期1173-1182,共10页Progress in Geophysics

基　　金：国家大型油气田及煤层气开发科技重大专项"低渗透碎屑岩储层品质与岩石物理相测井评价方法"(2011ZX05020-008);中石油创新基金(2013O-5006-030)资助

摘　　要：充分利用岩心、薄片和钻测井等资料,对四川盆地JQ区块须家河组须二段致密砂岩气储层的沉积微相、成岩相和裂缝相特征进行了研究.结果表明,须二段沉积以辫状河三角洲前缘为主,发育水下分流河道、河口坝和分流间湾等微相;根据成岩作用类型、强度、成岩矿物及其对储层物性的影响将储层划分为压实致密、碳酸盐岩胶结、伊蒙混层充填和不稳定组分溶蚀4种成岩相;裂缝相则以局部层段发育的近水平缝为主.通过三者的叠加与复合对储层岩石物理相进行分类命名,划分出了河口坝-不稳定组分溶蚀-近水平缝相等多种岩石物理相.然后按照岩石物理相对储层物性的建设与破坏作用对其进行聚类分析,归纳出了PF1～PF4四大类岩石物理相.通过建立每一类岩石物理相的孔隙度-渗透率关系表明,基于岩石物理相约束而建立的储层渗透率解释模型具有更高的精度.岩石物理相是揭示致密砂岩气储层成因机理并提高其物性参数测井解释精度的有效途径.The sedimentary micro-facies,diagenetic facies and fracture facies of tight gas sandstone reservoirs of Upper Triassic Xujiahe Formation Member 2（Xu-2）in Jinqiu area are studied by making full use of core observation,thin sections,logging and drilling data.The results show that the Xu-2sandstones are formed in the sedimentary facies zone of braided delta front subfacies,of which the sedimentary micro-facies can be divided into underwater distributary channel,mouth bar and underwater distributary bay.The diagenetic facies of the reservoir can be divided into 4types according to the types and intensify of diagenesis,diagenetic minerals,they are：corrosion of unstable components,compaction density,illite and smectite mixed-layer filling,carbonate cementation,while the fracture facies of Xu-2sandstone are mainly composed of horizontal fracture appeared in local layers.Then the petrophysical facies can be divided through the superimpositions and coupling of the sedimentary micro-facies,diagenetic facies and fracture facies,many types of petrophysical facies of Xu-2sandstone such as braided delta front mouth bar-middle compaction corrosionhorizontal fracture are divided in this way.Considering this may result in the quantity of petrophysical facies is very large,so this paper sums out four mainly types（PF1,PF2,PF3,PF4）of petrophysical facies according to the impact of sedimentary facies,diagenetic facies and tectonic facies on the reservoir property and pore structure of Xu-2 sandstones.Various interpretation models of permeability for different petrophysical facies were set up,and the results show that the interpretation model of permeability confined by petrophysical facies can provide reliable parameters for developing geologic model and reservoir simulation. The method to classify reservoir based on the division of petrophysical facies is an efficient way to revelation of reservoir genetic mechanism and to improve the accuracy of permeability computation of tight gas sandstone reservoirs.

关 键 词：岩石物理相 致密砂岩气 沉积相 成岩相 裂缝相 渗透率解释建模 须二段 JQ区块 

分 类 号：P631[天文地球—地质矿产勘探]