歧口凹陷页岩油岩性特征及甜点快速识别

Rapid identification of lithology characteristics and desserts in Qikou Ditting shale

歧口凹陷沙一下段页岩油储层具有分布范围广、厚度大、有机质丰度高的特点,岩石类型以碳酸质页岩和混合质页岩为主。由于不同岩石类型页岩物性、储集空间等均存在较大差别,甜点测井识别困难。本文基于岩心及测井资料综合分析,选取补偿密度、补偿声波和自然伽马等敏感测井曲线建立岩性识别指示曲线,利用交会图等方法确定主要岩石类型识别标准。在岩性识别基础上,分别确定碳酸质页岩、混合质页岩不同甜点类型测井响应特征,选取能够反映页岩油储层七性关系的敏感曲线构建综合评价指数曲线,确定Ⅰ、Ⅱ、Ⅲ类甜点划分标准,进行页岩油甜点快速识别。所形成的的甜点测井评价方法在生产实践中取得了很好的应用效果。

The shale oil reservoir in the lower section of Qikou depression sand has the characteristics of wide distribution range,large thickness and high abundance of organic matter,and the rock types are mainly carbonated shale and mixed shale.Due to the large differences in shale physical properties and storage space of different rock types,dessert logging identification is difficult.Based on the comprehensive analysis of core and logging data,the compensation density,compensated sound wave and natural gamma sensitive logging curves are selected to establish the lithology identification indicator curve,and the identification standard of the main rock types is determined by using the intersection diagram and other methods.On the basis of lithology identification,the logging response characteristics of different types of carbonated shale and mixed shale were determined respectively,the sensitive curve that can reflect the seven sexual relationship of shale oil reservoir was selected to construct the comprehensive evaluation index curve,the classification standard of I and dessert were determined,and used to quickly identify shale oil desserts.The formed dessert logging evaluation method has achieved good application results in the production practice.