基于地层组分分析的储层孔隙度计算方法研究

针对火山岩、碳酸盐岩、致密砂岩等非均质性极强的储层孔隙度计算这一关键问题,提出基于地层组分分析的孔隙度计算方法。充分利用常规测井、元素俘获谱(ECS)测井等资料,优选出对待求地层组分敏感的测井系列,利用理论值法与交会图法确定出待求地层组分的理论测井响应值。该文根据地层组分分析原理联立方程组,采用最小二乘法求解方程组以获得地层组分的相对体积含量,进而准确确定出孔隙度。该计算方法在三塘湖盆地A研究区火山岩储层评价中取得了理想效果,并为其他非常规储层孔隙度的计算提供了一定的参考。

Calculation method of porosity based on formation component analysis

Porosity calculation is the key for the evaluation of volcanic rocks, carbonate rocks, tight sands and other heterogeneous reservoirs. The method based on formation component analysis was proposed to calculate porosity. With the full use of conventional logging data and ECS （Elemental Capture Spectroscopy） logging data, the log data sensitive to formation component were selected, the theoretical log response of formation component was determined by making crossplot. The equation was established based on the formation component analysis. The volume content of the formation components was calculated by least squares method, and then the porosity was determined. This calculation method was applied to the evaluation of igneous reservoir in A study area of Santanghu Basin, and good result has been achieved. And it provides some reference for other unconventional reservoir about porosity calculation.