高自然伽马致密砂岩储层参数解释模型——以鄂尔多斯盆地大牛地气田D区为例

Fine Interpretation Model of Reservoir Parameters Logging for High Natural Gamma Tight Sandstone Gas Reservoir——Taking Area D of Daniudi Gas Field in Ordos Basin as an Example

针对鄂尔多斯盆地大牛地气田D区上古生界高自然伽马致密砂岩储层,在测井资料处理的基础上,利用岩心化验分析资料刻度测井资料,分析了不同岩相的测井响应特征,分层位建立了测井解释标准。分别建立了下二叠统太原组一段、二段(P1t1、P1t2),山西组一段、二段(P1s1、P1s2)、下石盒子组一段、二段、三段(P1h1、P1h2、P1h3)共7个层位的泥质体积分数、孔隙度、渗透率解释模型。基于岩电试验分析,并结合地层水矿化度分析资料,建立了该区流体性质识别标准及7个层位的含水饱和度解释模型。依据大牛地气田D区测井资料、地质认识、测试资料、岩心分析资料,建立了一套适合该区目的层高自然伽马致密砂岩储层的参数计算及流体性质判识方法,并对该区太原组、山西组、下石盒子组储层进行测井精细解释,解释结果得到了岩心分析、试气结果的验证。

Aiming at the upper Paleozoic high natural gamma sandstone reservoir in area D of Daniudi gas field,Ordos Basin,and on the basis of logging data processing,the logging response characteristics of different lithofacies were analyzed by using the calibration logging data of core analysis data,and the logging interpretation standard was established by stratification.The interpretation models of clayey mass fraction,porosity and permeability of seven groups,namely the first and second sections of the Lower Permian Taiyuan formation(P 1t 1,P 1t 2),the first and second sections of Shanxi Formation(P 1s 1,P 1s 2),and the first,second and third sections of Lower Shihezi Formation(P 1h 1,P 1h 2 and P 1h 3),were established respectively.Based on the analysis of rock electricity test and formation water salinity analysis data,the identification criteria of fluid properties in this area and the water saturation interpretation model with seven levels were established.Based on logging data,geological knowledge,testing data and core analysis data in area D of Daniudi gas field,a set of reservoir parameter calculation and fluid property identification methods suitable for high natural gamma sandstone reservoir of target stratum in this area were established.In addition,the fine logging interpretation was conducted towards the reservoirs of Taiyuan Formation,Shanxi Formation and Lower Shihezi Formation in this area,and the interpretation results were verified by core analysis and gas testing results.