Application of Logging Data in Calculating Mud Shale Thickness

Abstract

Abstract: One of the basic tasks for evaluating hydrocarbon source rocks is calculating mud shale thickness. According to the characteristics that the shale particles can absorb radioactive substances, a mathematical relationship is built between natural gamma and shale content. The calculated results showed that the values of shale content ranged from 0 to 1. Eight typical wells were selected in Ordos Basin. Mud shale and non-mud shale values were observed in core interval of single well to confirm the shale content boundary which could distinguish mud shale and non-mud shale and the boundary was 0.7. Using this boundary, the mud shale values were read in Chang73 oil layer of Triassic Yanchang Formation in Ordos Basin and the distribution map of mud shale thickness was drawn by comparison with the existing results. The results showed that this method was feasible and accurate and layed a foundation for further evaluation of source rocks.

Key words: hydrocarbon source rock, shale content, mud shale thickness, Ordos Basin

Li Wei, Liu Luofu, Wang Yanru, Zhang Zhihuan and Lu Cheng. Application of Logging Data in Calculating Mud Shale Thickness[J]. China Petroleum Exploration, 2012, 17(5): 32-35,70,82.

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Application of Logging Data in Calculating Mud Shale Thickness

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