三塘湖盆地芦草沟组致密油烃源岩总有机碳含量计算

Calculating Organic Carbon Content of Tight Oil Source Rocks of Lucaogou Formation in Santanghu Basin

三塘湖盆地芦草沟组烃源岩是二叠系油气的主要来源,研究其有机质丰度对评价该区烃源岩具有重要意义。采用Δlog R法可以定性识别生油岩,并计算总有机碳含量;通过分析烃源岩的测井响应特征得到总有机碳含量与测井曲线之间的关系,进行多元线性回归分析,获得烃源岩总有机碳含量的计算模型。经对比分析,多元回归法能准确反映芦草沟组烃源岩总有机碳含量的变化趋势,且计算简便,可广泛用于三塘湖盆地芦草沟组烃源岩定量评价工作。

Source rocks of Lucaogou formation in Santanghu basin are the main oil and gas resources of Permian, so it is very important to study their organic matter abundance for the source rocks evaluation. By using △logR technique, source rocks can be qualitatively identified and total organic carbon content can be calculated. We analyze the logging respond characteristics of hydrocarbon source rock to get the relationship between TOC and logging curves, and multiple linear regression analysis are carried out and then the source rocks TOC calculation model is proposed. The contrast analysis results show that the model can precisely reflect the change trend of TOC of Lucaogou source rocks and the calculation is simple and convenient, so this model can be widely used in the source rocks evaluation of Lucaogou formation in Santanghu basin.