乌马营二叠系致密砂岩气层测井评价方法的完善

Improvement of logging evaluation method for Wumaying Permian tight sandstone gas reservoirs

以大港油田乌马营地区YGXX井为代表的二叠系石盒子组深层低孔特低渗致密储集层目前勘探程度较低,没有形成配套的测井评价方法。针对乌马营二叠系致密砂岩含气储集层,利用岩心常规分析数据与测井曲线敏感参数相结合,优化储集层参数计算模型,并引入流动单元概念开展储集层有效性评价,建立了储集层有效性评价图板及重新计算渗透率、孔隙度比值(K′/φ′)与电阻率比值(RT/Rsh)交会图板,形成了一套致密砂岩气层的测井解释评价技术,填补了该层系致密砂岩储集层测井评价方法的欠缺。在乌马营地区应用6井次效果明显,解释符合率上升至82.4%。

The deep low porosity and ultra-low permeability tight reservoir of Permian Shihezi Formation,represented by YGXX well in Wumaying area of Dagang Oilfield,has low degree of prospecting and no matching logging evaluation method has been formed.For Wumaying Permian tight sandstone gas-bearing reservoirs,based on the combination of core routine analysis data with sensitive parameters of well log,the calculation model of reservoir parameters is optimized,and the concept of flow unit is introduced to carry out reservoir effectiveness evaluation.The effectiveness evaluation chart and the crossplot chart of the recalculated ratio of porosity to permeability(K′/φ′)and the resistivity ratio(RT/Rsh)are established,a set of logging interpretation and evaluation technology for tight sandstone gas reservoir is formed,which fills the blank of logging evaluation method for tight sandstone reservoir of this layer series.The effect of 6 wells in Wumaying area is obvious,and the interpretation coincidence rate rises to 82.4%.