梨树断陷砂砾岩储层测井评价方法研究

STUDY ON THE EVALUATION METHOD OF GLUTENITE RESERVOIR IN LISHU FAULT DEPRESSION BY WELL LOGGING

砂砾岩体岩性复杂、非均质性强、油水层岩电关系特征不明显,导致准确计算砂砾岩储层参数比较困难。本文应用构建的岩性指示曲线来识别梨树断陷砂砾岩岩性。在此基础上,分类求得各类岩性的渗透率公式和岩电参数,再应用三水模型计算含水饱和度,对砂砾岩储层进行测井评价。实际应用中,岩性敏感指示曲线与录井所描述的岩性有很好的对应性。在岩性识别基础上计算的孔隙度,渗透率和含水饱和度等储层参数与岩心分析结果一致,据此得出的解释结论与测试结论一致。本文所研究的测井评价方法对其它地区的砂砾岩储层测井评价也具有指导意义。

Lithology identification and well logging evaluation of glutenite has always been the difficulty because of its complex lithology, strong anisotropy and unconspicuous rock-electricity relationship between oil and water layers. The lithology-sensitive index curve is used in this paper to indentify glutenite lithology. Based on it the permeability equation and electric parameters of every lithology are developed. Finally water saturation is computed and the glutenite reservoir can be evaluated. The practical applications indicated that the lithology-sensitive index curve corresponds with the geologging result,and the computed reservoir parameters agreed with the results of testing. The method can provide reference for glutenite well logging evaluation in other areas.