Characteristics and Genesis of Heavy Oil in Shallow and Thin Layers in Chepaizi Area, Xinjiang, China

Jianqiang Tao, Chunyu Hu (), Wenfeng Wang (), Xiangquan Gao, Shuo Feng, Changcheng Han and Jiapeng Zhang
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Jianqiang Tao: Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China
Chunyu Hu: Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China
Wenfeng Wang: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China
Xiangquan Gao: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China
Shuo Feng: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China
Changcheng Han: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China
Jiapeng Zhang: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China

Energies, 2024, vol. 17, issue 23, 1-14

Abstract: The Neoproterozoic Shawan Formation in the Chepaizi area is recognized for its significant heavy oil resources. Investigating the underlying causes and mechanisms of heavy oil changes in accordance with the specific characteristics of the reservoir is crucial for future exploration and development. The distribution of heavy oil in the Pai 612 block was identified to present a combination of shallow and thin deposits, high porosity, high permeability, and elevated water content. The physicochemical properties of the crude oil included a complex composition, high density, high viscosity, substantial gel content, and notable oxidation-biodegradation potential. The oxidation and biodegradation of crude oil during transportation played the critical roles in the formation of heavy oil. As cru3de oil was transported upward, the formation temperature decreased, resulting in increased viscosity. An excess of water could initially increase and subsequently decrease heavy oil viscosity, while groundwater in the reservoir contained various chemicals that interacted with colloids and asphaltenes, further increasing the viscosity. During the formation of the early heavy oil reservoir, the light oil was unable to dissolve and transport the high-molecular-weight asphaltene component, leading to the high resin content in the heavy oil of the Pai 612 block.

Keywords: heavy oil; shallow thin layer; genesis mechanism; Chepaizi area (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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