| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
LI Wenjun, DUAN Dongping, HE Xianke, CHEN Bo, WANG Wei. CATEGORY DESCRIPTION AND FLUID DETECTION FOR LOW PERMEABILITY RESERVOIRS IN HY GAS FIELD OF XIHU SAG[J]. Marine Geology Frontiers, 2021, 37(12): 17-26. doi: 10.16028/j.1009-2722.2021.125
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CATEGORY DESCRIPTION AND FLUID DETECTION FOR LOW PERMEABILITY RESERVOIRS IN HY GAS FIELD OF XIHU SAG
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Abstract
The HY Gas Field is located in the south of the central inversed structural belt of the Xihu Sag. The upper part of Huagang Formation is dominated by shallow water deltaic deposits, and the reservoir is characterized by medium-low porosity and low permeability, of which the seismic response characteristics are of class II AVO. Affected by compaction, the reservoir porosity gradually decreases from top to bottom, as AVO type changes from Class IIb to Class IIa. In this paper, a detailed description method for the low permeability reservoir with different AVO characteristics is proposed from petrophysical analysis, forward simulation, phase conversion and AVO projection angle rotation. It is considered that the medium-porosity and low-permeability reservoirs in the area are characterized by class IIb AVO response characteristics, and the post-stack seismic sand top is calibrated in the trough. Reservoir description should adopt post-stack 90 degree phase shift waveform interpretation, post-stack envelope attribute fluid detection, etc. Low porosity and low permeability reservoirs are characterized by class IIa AVO response characteristics. Reservoir description should use post-stack 0 degree phase shift waveform interpretation, pre-stack extended elastic impedance fluid detection and other methods. Based on the fine reservoir description method of "one method for one layer", multiple wells were successfully drilled in the study area, and the success rate of reservoir prediction and fluid detection was 100%, which has greatly improved the development of the gas field.
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References
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LI Wenjun, DUAN Dongping, HE Xianke, CHEN Bo, WANG Wei. CATEGORY DESCRIPTION AND FLUID DETECTION FOR LOW PERMEABILITY RESERVOIRS IN HY GAS FIELD OF XIHU SAG[J]. Marine Geology Frontiers, 2021, 37(12): 17-26. doi: 10.16028/j.1009-2722.2021.125
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Figure 1.
Geographic location of the study area and locations of geological sections and wells
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Figure 2.
Correlation of sand bodies of the target layer
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Figure 3.
Analysis of influencing factors on physical properties of low permeability reservoir in Upper Member of Huagang Formation in HY Gas Field
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Figure 4.
AVO response characteristics of sandstone and mudstone under compaction
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Figure 5.
Prestack forward modeling of low permeability reservoir with different porosity in HY Gas Field
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Figure 6.
Calibration of low permeability reservoir in HY Gas Field
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Figure 7.
−90 ° phase conversion seismic profile of type Ⅱb reservoir
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Figure 8.
−90° phase waveform interpretation and correlation with drilling results of class Ⅱa reservoir
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Figure 9.
Comparison of minimum amplitude attribute and negative amplitude attribute of H4 in HY Gas Field
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Figure 10.
Zero phase waveform interpretation and correlation with drilling results of class IIa reservoir
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Figure 11.
Inversed of reservoir thickness map by Vp/Vs in H5 reservoir HY Gas Field
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Figure 12.
Principle of extended elastic impedance fluid detection
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Figure 13.
Profile of extended elastic impedance fluid detection