Lithofacies identification and prediction of Chang 7₃ shale oil reservoirs in Ordos Basin: insights from the multi-resolution graph-based clustering analysis
by Ruiliang Guo; Junhong Jia; Guangjun Xu; Fei Liu; Jingzhou Zhao; Yubin Bai; Weitao Wu; Lei Cao
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 36, No. 1, 2024

Abstract: The Chang 7 member of Yanchang formation of the Ordos Basin contains abundant shale oil resources, making it the core area for exploration and exploitation of lacustrine shale oil in China recent years. However, the strong spatial heterogeneity makes lithofacies identification and prediction a key challenge in shale oil reservoir development. This study divides the lithofacies of the Chang 7₃ shale oil reservoir into four types based on sedimentary structure, mineral composition, and TOC content, namely high TOC tuffaceous laminated shale, high TOC argillaceous laminated shale, moderate TOC felsic laminated shale, and moderate TOC felsic bedded mudstone. Multi-resolution graph-based clustering analysis (MRGC) was used to perform cluster analysis on lithofacies sensitive logging, including GR, AC, DEN, RT, and SH, and the electrofaices was compared with single well lithofacies to establish the logging value range model for different lithofacies.. This study validates the applicability of MRGC in shale lithofacies division and rapid prediction. [Received: January 4, 2024; Accepted: February 13, 2024]

Online publication date: Wed, 03-Jul-2024

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