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This study was sponsored by Major Science and Technology Special Project of CNPC (Grant No. 2023ZZ07). We sincerely appreciate the collaboration and support of the State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum (Beijing), and are also grateful for Shi Shengbao and Zhu Lei for their assistance in the geochemical experiments and analytical processes of all oil sand samples. In addition, the authors also wish to thank the anonymous editors and reviewers for their constructive suggestions and comments on this paper.

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    Abstract:

    The Lower Cretaceous Manville Group of Upper McMurray Formation is one of the main bitumen reservoirs in Athabasca. In this study, the relationship between reservoirs heterogeneity and bitumen geochemical characteristics were analyzed through core and microscopic observation, lab analysis, petrophysics and logging data. Based on the sedimentology framework, the formation environment of high-quality oil sand reservoirs and their significance for development were discussed. The results indicate that four types lithofacies were recognized in the Upper McMurray Formation based on their depositional characteristics. Each lithofacies reservoirs has unique physical properties, and is subject to varying degrees of degradation, resulting in diversity of bitumen content and geochemical composition. The tidal bar (TB) or tidal channel (TC) facies reservoir have excellent physical properties, which are evaluated as gas or water intervals due to strong degradation. The reservoir of sand bar (SB) facies was evaluated as oil intervals, due to its poor physical properties and weak degradation. The reservoir of mixed flat (MF) facies is composed of sand intercalated with laminated shale, which is evaluated as poor oil intervals due to its poor connectivity. The shale content in oil sand reservoir is very important for the reservoir physical properties and bitumen degradation degree. In the context of regional biodegradation, oil sand reservoirs with good physical properties will suffer from strong degradation, while oil sand reservoirs with relatively poor physical properties are more conducive to the bitumen preservation.

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YANG Xiaofa, YU Diyun, WU Suwei, REN Junhao, CHENG Dingsheng, HUANG Jixin, YANG Chengyu, MA Guoqing, LI Meijun.2024.[J]. Acta Geologica Sinica(),98(5):1285-1300

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History
  • Received:April 11,2023
  • Revised:September 12,2023
  • Online: October 25,2024
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