致密砂岩气藏储层物性上限界定与分布特征  

Upper limit and distribution of physical property of tight gas sandstones

作　　者：王朋岩[1] 刘凤轩[1] 马锋[2] 杨勉[1] 林益康 卢冲 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国石油石油勘探开发研究院,北京100083 [3]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202 [4]中国石油青海油田分公司采油一厂,青海茫崖816499

出　　处：《石油与天然气地质》2014年第2期238-243,共6页Oil & Gas Geology

基　　金：国家科技重大专项(2011ZX05028-002);黑龙江省普通高等学校青年学术骨干支持计划项目(1155G03)

摘　　要：致密砂岩气成藏形成过程受到砂岩储层低孔、低渗特点的控制,人们已经认识到只有在某一上限值以下的储层中才会形成大面积低丰度的致密砂岩气聚集,但这一界限值一直缺少公认的标准。通过收集国内外典型致密砂岩气藏实测储层物性数据,经过统计分析,研究致密储层渗透率、孔隙度分布规律,总结致密物性的形成原因和致密砂岩气成藏特征。数据分析结果表明国内外典型致密砂岩气藏常规测试渗透率有超过80%的数据点小于0.1×10-3μm2。经过校正的原地渗透率值比常规渗透率低一个数量级。据此可以用常规渗透率0.1×10-3μm2作为致密砂岩储层物性上限,具有合理性和可操作性。通过统计全球致密砂岩气藏数据,认识到致密砂岩储层形成环境多样,深度跨度大,地质年代差异大。构造活动、沉积环境和成岩作用是形成储层致密的主要原因,但在各个盆地具体表现各有不同。通过气源、构造活动强度和储层致密程度可以圈定致密砂岩气的分布范围。The formation of tight gas is controlled by the low porosity and permeability of sandstone reservoirs .It has been recognized that the accumulation of pervasive low abundance tight gas is possible only when the porosity and permeability of reservoir is above a certain limit value .However , there are no widely accepted criteria for defining this limit value . Based on collection of the measured reservoir property of both domestic and international typical tight gas sands ,we stu-died the statistical distribution patterns of permeability and porosity of tight reservoirs ,and analyzed the causes for reser-voir tightening and the characteristics of tight gas accumulation .Data show that over 80%routine permeability data points have a permeability less than 0.1 ×10 -3 μm2 .The corrected in-situ permeability is about one order of magnitude lower than the routine permeability .Taking the routine permeability value of 0.1 ×10 -3 μm2 as the upper limit of tight gas sands is reasonable and practical .Statistics of tight gas sands over the world shows that tight sandstone reservoirs have di -versity of sedimentary environments ,large depth span ,and long time range in geological age .Tectonic activity ,sedimenta-ry environment and diagenesis are the main factors for the formation of tight reservoir ,but they play a different role in dif-ferent basins .The distribution of tight gas sands can be delineated by analyzing source rock ,tectonic movements and rese-rvoir tightness .

关 键 词：常规渗透率 原地渗透率 储层物性 致密砂岩气 

分 类 号：TE121.1[石油与天然气工程—油气勘探]