论文部分内容阅读
利用美国西部落基山地区7个致密砂岩气盆地(Washakie、Uinta、Piceance、Greater Green River、Wind River、Powder River、Sand Wash)的常规孔隙度(2 100点)、常规渗透率(2 073点),分析致密砂岩物性参数的概率特征,结合国内的典型致密砂岩气藏(鄂尔多斯盆地苏里格气田上古生界储层)覆压基质渗透率和孔隙度数据对其致密特征进行验证,在此基础上提出统计学范畴的致密气定义:“如果覆压基质渗透率值累加概率在80%范围内都小于0.1×10~(-3) mm~2,可认为是典型致密储层,部分高于此值则为过渡状态,对应孔隙度界限值可为10%”。在全球范围内选出7个大区的44个致密砂岩气盆地,典型致密储层评价单元的物性参数分布规律符合致密气统计学定义,同时按照“全球”“大区”“国家”“盆地”级别分别对“盆地类型”“沉积环境”“评价时代”“源岩时代”“源岩岩性”“源岩类型”“源岩成熟度”“储层平均埋深”“评价面积”“其他机构资评结果”“开发程度”等盆地参数进行数据挖掘,旨在弄清在全球范围内致密砂岩气盆地各项参数的分布特征,结合全球板块构造学说、层序地层学说、致密砂岩气成藏机制和富集规律,对各个参数的统计规律进行分析论证。
Using conventional porosity (2 100 points) in 7 tight sandstone gas basins (Washakie, Uinta, Piceance, Greater Green River, Wind River, Powder River, Sand Wash) in the western Rockies of the United States, conventional permeability (2 073 points) , The probability characteristics of physical parameters of tight sandstone are analyzed, and the dense characteristics of tight sandstone gas reservoir (the Upper Paleozoic reservoir in the Sulige gas field, Ordos Basin) and its porosity data are verified. Based on this, On the definition of tight gas in the statistical category: “If the cumulative probability of overburden matrix permeability values are less than 0.1 × 10 -3 mm 2 in the range of 80%, it can be considered as a typical tight reservoir with some high At this value is the transition state, the corresponding porosity limit may be 10% ”. In 44 tight sandstone gas basins selected from 7 major regions in the world, the physical parameter distribution of the typical tight reservoir evaluation unit complies with the definition of tight gas statistics. At the same time, according to the principle of “global ” “Country ” “Basin ” level, respectively, on the “basin type ” “sedimentary environment ” “evaluation age ” “source rock age ” “source rock lithology ” source rock type “” Source rock maturity “” average buried depth “” area “” According to the global plate tectonics theory, sequence stratigraphy theory, tight sandstone gas accumulation mechanism and enrichment rule, the statistical rules of various parameters are analyzed and verified.