利用测井曲线的洛伦兹系数评价地层的非均质性

简要介绍了测井资料洛仑兹系数的原理和计算方法,将洛仑兹系数和含砂比引入到测井数据处理当中。将常规测井曲线的洛仑兹系数与含砂比结合能够对钻井剖面的非均质性进行有效评价,为地层非均质性的定量评价提供了一种新思路。首先根据地层资料信息选择了对地层非均质性较为敏感的自然伽马曲线作为地层非无质性评价曲线;然后计算出地层的含砂比和洛伦兹系数;最后针对自然伽马测井曲线的洛伦兹系数结合含砂比给出了钻井剖面地层的层内非均质性,进一步挖掘地层的砂体结构信息。根据多井评价结果做出了鄂尔多斯盆地苏里格气田召60区块地层和含砂比的平面分布图,可以看出盒8^上与盒8^下段地层中部较为均质,储层分选性较好。

Evaluation of Formation Heterogeneity Using Lorentz Coefficient of Logging Curves

We introduced the calculation principle and the application method of Lorentz coefficient of logging data .Lorentz coefficient and sand ratio were introduced into the logging data processing . Lorentz coefficient and sand ratio of conventional logging curves can be used to evaluate formation effectively .It provided a quantitative formation evaluation method .In order to evaluate the formation heterogeneity ,firstly we selected GR logging curve as evaluating curve as it is more sensitive to heterogeneity ;secondly ,we evaluated the heterogeneity according to Lorentz coefficient combined with sand ratio ;and further , we extracted more information on sand structure formation . The formation plane distribution map of Lorentz coefficient and sand ratio is given based on multi‐well evaluation results .It can be concluded that the formation of middle region of Zhao 60 block of Sulige gas field of Ordos basin is more homogeneous with good sorting .