Initial Occurrence State and Movability Evaluation of the Gulong Shale Oil Reservoir, Songliao Basin

Guozhong Zhao, Linsong Cheng, Pin Jia, Yong Liu, Haoran Feng (), Tie Kuang and Qingzhen Wang
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Guozhong Zhao: Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
Linsong Cheng: School of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Pin Jia: School of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Yong Liu: Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
Haoran Feng: School of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Tie Kuang: Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
Qingzhen Wang: Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China

Energies, 2024, vol. 17, issue 6, 1-14

Abstract: The Qing-1 layer of the Gulong Depression in the northern Songliao Basin is a liquid-rich shale oil reservoir that has the characteristics of nanopores, high maturity, high gas/oil ratio (GOR), etc. The production performance of wells in the Gulong shale oil reservoir shows the characteristics of “single gas production followed by oil-gas production”. It is difficult to analyze the initial occurrence state and movability of fluid in the shale nanopores using conventional methods. In this study, a comprehensive method, including phase behavior analysis, physical experiments, and molecular simulation, was established to analyze the initial occurrence state and movability of fluid in the Gulong shale oil reservoir. The phase state of the fluid was calculated by the equation of state (EOS), considering nano-confinement effects, and the initial occurrence state was quantitatively evaluated by combining two-dimensional nuclear magnetic resonance (NMR) and molecular dynamics simulation. The movable fluid saturation was quantitatively determined by centrifugal experiments. The results show that the condensate gas state was in small pores, while the volatile oil state was in large pores. The occurrence states of oil were mainly adsorbed oil and free oil. The proportion of adsorbed oil in inorganic pores was about 24.4%, while the proportion of absorbed oil in organic pores was about 57.8%. Based on the cutoff value of T 2 before and after the centrifuged laboratory experiments, the movable limit of oil was determined to be 4.5 nm, and the movable fluid saturation was about 11%. The research method proposed in this study has important guiding significance for the initial occurrence state and movability evaluation of similar liquid-rich shale reservoirs.

Keywords: Gulong shale oil reservoir; nano-confinement effects; phase behavior; initial occurrence state; movability evaluation (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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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