中拐凸起黏土化蚀变火山岩孔隙度评价方法

火山岩物性评价中,黏土化蚀变火山岩孔隙度的定量计算一直是测井解释难题。通过对研究区25口井的测录井资料、薄片分析、全岩矿物等进行分析,优选出对黏土化蚀变反映较为敏感的测井曲线。在测井系列分析的基础上,优化黏土化蚀变指示因子,建立了研究区黏土蚀变程度指数模型,利用黏土蚀变程度指数对黏土化蚀变火山岩的黏土含量进行定量计算,利用体积模型对黏土化蚀变的火山岩孔隙度进行计算。计算结果与分析孔隙度进行对比,精度得到大大提高。该方法较好地解决了黏土化蚀变火山岩孔隙度定量评价问题,对火山岩储层试油选层、油气藏精细评价及后期勘探开发提供了一定的理论参考依据。

Porosity Evaluation Method for Clay-altered Volcanic Rocks in Zhongguai Uplift

The quantitative calculation of clay-altered volcanic rock porosity has always been a difficult problem in log interpretation.By analyzing the log data,thin section analysis and whole rock analysis of 25 wells in the study area,the logging curves which were sensitive to the reflection of clay alteration were optimized.Based on the analysis of logging series,the indicative factor of clay alteration was optimized,the index model of clay alteration degree in the study area was established,the clay content of clay altered volcanic rock by using the index of clay alteration degree was quantitatively calculated,and the porosity of volcanic rock with clay alteration by using volume model was calculated in this paper.By comparing the porosity of core analysis,the accuracy of porosity calculation was greatly improved.This method solved the problem of quantitative evaluation of porosity for clay altered volcanic rock and provided some theoretical reference for the selection of test,the fine evaluation of oil and gas reservoir and the exploration and development of the later stage of volcanic reservoir.