CAJ | 학술논문

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。
치밀사암기성장형성과정수도사암저층저공、저삼특점적공제，인문이경인식도지유재모일상한치이하적저층중재회형성대면적저봉도적치밀사암기취집，단저일계한치일직결소공인적표준。통과수집국내외전형치밀사암기장실측저층물성수거，경과통계분석，연구치밀저층삼투솔、공극도분포규률，총결치밀물성적형성원인화치밀사암기성장특정。수거분석결과표명국내외전형치밀사암기장상규측시삼투솔유초과80％적수거점소우0.1×10-3μm2。경과교정적원지삼투솔치비상규삼투솔저일개수량급。거차가이용상규삼투솔0.1×10-3μm2작위치밀사암저층물성상한，구유합이성화가조작성。통과통계전구치밀사암기장수거，인식도치밀사암저층형성배경다양，심도과도대，지질년대차이대。구조활동、침적배경화성암작용시형성저층치밀적주요원인，단재각개분지구체표현각유불동。통과기원、구조활동강도화저층치밀정도가이권정치밀사암기적분포범위。
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 .