Abstract
Shale oil is a kind of unconventional oil resource with great potential. China is rich in shale oil resources. There is a good shale oil reservoir in the 3rd sub-member of The Triassic Chang 7 member in Southern Ordos Basin, but at present there is insufficient understanding of the physical and chemical characteristics of the rock. This results in frequent instability of the well wall during the drilling process, which affects the drilling cycle and the length of the horizontal segment. To this end, the research on B1 well, which is a key exploration well in the Southern Ordos Basin, is carried out in the experimental study of the core system observation description, structural analysis, and hydration degree test. The results show that the upper part of the reservoir is mainly black stratiform shale, with a large number of horizontal cracks, large sand sandwich density, low clay mineral content, and basically no hydration capacity The lower part is tuff, which has a certain degree of horizontal cracks and contains some structural seams. The content of clay minerals is high and it has certain hydration ability. The differences in the structural characteristics, hydration and salinity of the two types of reservoirs were clarified, which provided a basis for the design of subsequent anti-collapse drilling fluids, and provided a basis for safe and efficient drilling in the 3rd sub-member of The Triassic Chang 7 member in Southern Ordos Basin.
Copyright 2019, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.
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Acknowledgments
The project is supported by Major National Science and Technology Projects in the 13th Five-Year Plan (Evaluation of Exploration and Development Targets of Continental Shale Oil in Typical Basins of China, Number 2017ZX05049-006). Thank you to China Petrochemical Co., Ltd. North China Oil and Gas Branch and State Key Laboratory of Southwest Petroleum University for the geological information and experimental instruments provided for the study.
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Zhao, Pf. et al. (2020). Study on Physicochemical Characteristics of Shale Oil Reservoir Rocks in the 3rd Sub-member of the Triassic Chang 7 Member in Southern Ordos Basin. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_50
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