| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
PENG Xiaodong, ZHNAG Hui, WANG Xinguang, CHU Shasha, HUAN Jinlai, ZHAO Nan. CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION[J]. Marine Geology Frontiers, 2020, 36(8): 50-56. doi: 10.16028/j.1009-2722.2019.152
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CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION
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Abstract
The low-permeability reservoirs are large in reserve in the western South China Sea, but the utilization rate is quite low up to date. The major payzone of WS-A oilfield is of glutenite type. So far, few studies have been contributed to the characteristics of glutenite reservoir and its integrated evaluation. It is necessary to carry out the study of the microscopic pore structures so as to determine the potential and the difficulties which may be encountered in oil and gas production and development. In this paper, we selected some representative rock samples from the WS-A oilfield, and had various physical simulation experiments, such as constant velocity mercury intrusion, nuclear magnetic resonance, nonlinear test, clay mineral analysis and wettability measurement. Based on the characteristics of the microscopic pore-throat structure of the reservoir, a integrated reservoir evaluation method on six-element parameters was established for reservoir evaluation. It is found that in the WS-A low permeability glutenite oilfield, if the integrated classification coefficient of reservoirs is less than 5 or the permeability is less than 1×10−3 μm2, it belongs to the third type of reservoir and is very difficult to develop indeed; if the integrated classification coefficient of reservoirs is between 5-8 or the permeability vary between 1-30×10−3 μm2, it belongs to the second type of reservoirs, which is difficult to develop; if the integrated classification coefficient of reservoirs is greater than 8 or the permeability greater than 30×10−3 μm2, it belongs to the first type of reservoirs, which is easy to develop.
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References
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PENG Xiaodong, ZHNAG Hui, WANG Xinguang, CHU Shasha, HUAN Jinlai, ZHAO Nan. CHARACTERISTICS OF WS-A GLUTENITE RESERVOIR AND ITS INTEGRATED EVALUATION[J]. Marine Geology Frontiers, 2020, 36(8): 50-56. doi: 10.16028/j.1009-2722.2019.152
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Figure 1.
Location of Wushi-A Oilfield
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Figure 2.
Test results of constant speed mercury injection in Wushi-A Oilfield
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Figure 3.
Contrast of throat radius of constant velocity mercury injection between glutenite and sandstone
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Figure 4.
The contrast graph of mainstream throat radius of different blocks
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Figure 5.
Relation of movable fluid percentage to permeability
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Figure 6.
Comparison of NMRs of glutenite and sandstone with the same permeability grade
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Figure 7.
The contrast of movable fluid percentages of different blocks
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Figure 8.
Test results of starting pressure gradient
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Figure 9.
Water permeability of sandstone and glutenite with the same permeability changes versus pressure gradient
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Figure 10.
Contrast of starting pressure gradient of different blocks
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Figure 11.
Contrast of Clay minerals in rock samples of different blocks
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Figure 12.
The relationship between wettability index and oil displacement efficiency