摘要
川西南筇竹寺组页岩气有机质受演化程度、矿物组分、地层水矿化度等综合地质因素影响,储层对象相对川南龙马溪组更复杂,测井评价时如直接采用类似龙马溪组的计算模型并不完全适用。本文重点对较常用的5种模型进行重新研究,结果表明:在有机碳计算时,总伽马与无铀伽马多元拟合法效果最佳,且相对误差小。从实际应用效果看,上述方法可操作性强,评价精度高,为深入研究区筇竹寺组页岩气储层有机碳含量提供了有效的技术手段。
TOC of Qiongzhusi Shale Gas Reservoir in Southwest Sichuan is affected by comprehensive geological factors such as evolution degree, mineral composition and formation water salinity, and the reservoir object is more complex than that of Longmaxi formation, so the calculation model similar to Longmaxi Formation is not completely applicable in logging evaluation. This paper focuses on the re-study of five commonly used models, and the results show that: in the TOC calculation, the total gamma and no uranium gamma multielement fitting method has the best effect, and the relative error is small. From the practical application results, the above method has strong operability and high evaluation accuracy, which provides an effective technical means for further study of TOC content in shale gas reservoir of Qiongzhusi Formation.
