Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es32+3 submember of the Gao3102 fault block in the Gaoshangpu Oilfield

Chen Ruxian; Hou Jiagen

doi:10.19509/j.cnki.dzkq.tb20220184

Volume 42 Issue 6

Nov. 2023

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Article Navigation > Bulletin of Geological Science and Technology > 2023 > 42(6): 174-186

Chen Ruxian, Hou Jiagen. Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es32+3 submember of the Gao3102 fault block in the Gaoshangpu Oilfield[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 174-186. doi: 10.19509/j.cnki.dzkq.tb20220184

Citation:

Chen Ruxian, Hou Jiagen. Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es₃²⁺³ submember of the Gao3102 fault block in the Gaoshangpu Oilfield[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 174-186. doi: 10.19509/j.cnki.dzkq.tb20220184

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Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es₃²⁺³ submember of the Gao3102 fault block in the Gaoshangpu Oilfield

doi: 10.19509/j.cnki.dzkq.tb20220184

Chen Ruxian^{a, b
,},
Hou Jiagen^{a, b
,
,}

a.
College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
b.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China

Received Date: 29 Apr 2022
Accepted Date: 08 Sep 2022
Rev Recd Date: 03 Sep 2022

Abstract

Abstract

Objective
In order to clarify the occurrence characteristics of movable fluids in medium- and low-permeability reservoirs, so as to better guide the increase in oil reserves and production in the oilfield.
Methods
This study focuses on the medium- and low-permeability sandstone reservoirs in the Es₃²⁺³ submember of the Gao3102 fault block in the Gaoshangpu Oilfield. Based on thin section data, whole-rock diffraction analysis, high-pressure mercury injection curves, closed core nuclear magnetic resonance data, scanning electron microscopy, and oil-water phase permeability curves, the occurrence characteristics and influencing factors of movable fluids in reservoirs with different pore structures were conducted.
Results
The results show that (1) the movable fluid saturation of reservoirs with different pore structures varies greatly. The T₂ spectrum of the nuclear magnetic resonance of the class Ⅰ medium porosity and medium throat reservoir is bimodal with left low and right thigh, and the average saturation of movable fluid is 61.14%. The T₂ spectrum of the nuclear magnetic resonance of the class Ⅱ medium and small pore fine throat reservoir shows a double peak type with left high and right high, and the average of movable fluid saturation is 45.24%. The T₂ spectrum of the nuclear magnetic resonance of the class Ⅲ fine porous micro throat reservoir shows a double peak type of left high and right low, and the average of movable fluid saturation is 30.45%. The T₂ spectrum of the nuclear magnetic resonance of the class Ⅳ microporous micro throat reservoir shows a left high single peak, and the average saturation of movable fluid is 13.86%. (2) The macroscopic physical properties, microscopic pore structure, clay mineral content and reservoir wettability of the reservoir jointly control the occurrence characteristics of the movable fluid. Among them, the microscopic pore structure is a key factor in the occurrence of movable fluid. The larger the pore throat radius is, the better the reservoir seepage capacity, the lower the clay mineral content is, the weaker the reservoir wettability is, and the higher the movable fluid saturation is.
Conclusion
The results of this research can provide a reasonable scientific basis for high-efficiency water injection development of the Es₃²⁺³ reservoir in the Gaoshangpu Oilfield.
- Gaoshangpu Oilfield,
- Es₃²⁺³ submember,
- microscopic pore structure,
- movable fluid

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References(40)

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Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es₃²⁺³ submember of the Gao3102 fault block in the Gaoshangpu Oilfield

doi: 10.19509/j.cnki.dzkq.tb20220184

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Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es32+3 submember of the Gao3102 fault block in the Gaoshangpu Oilfield

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Occurrence characteristics and influencing factors of movable fluid in the medium- and low-permeability reservoirs of the Es₃²⁺³ submember of the Gao3102 fault block in the Gaoshangpu Oilfield