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| vP/vS applied to fluid identification of tight sandstone reservoir of Dongsheng gas field |
| Can LI, Ping-Jun GUI |
| Research Institute of Exploration and Development,North China Branch,SINOPEC,Zhengzhou 450006,China |
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Abstract The longitudinal heterogeneity of reservoir and gas saturation in He 1 member of well block Jin 72 of Dongsheng gas field is quite large, and gas and water distribution is diverse.Predicting effective reservoir is a key issue in exploration and development.Combined with well logging data,a statistical and comparative study method was used to establish the logging response characteristics and the criteria of fluid identification in the tight sandstone reservoir of He 1 member.The theory proves that the gas-bearing sandstone decreases with the increase of gas saturation,and the longitudinal wave velocity and the shear wave velocity decrease,but the longitudinal wave velocity changes more than the shear wave velocity.Therefore,the longitudinal and transverse wave velocity ratio decreases.Based on this theory,the reservoir fluid is quantitatively identified through cross-section analysis.At the same time,based on the longitudinal and transverse wave velocity ratio inversion and longitudinal wave impedance inversion analysis,the regularity of gas-water distribution and its spatial distribution characteristics in He 1 member of the study area are clarified,which provides the basis for oil and gas exploration in the study area.
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Received: 16 May 2018
Published: 31 May 2019
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The map of structural location in wellblock Jin 72 of Dongsheng gas field
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Natural gamma and sonic time difference intersection diagram of He 1 reservoir in wellblock Jin 72
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A well logging and gas measurement integrated map of in wellblock Jin 72
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The feature of logging identification of He 1 reservoir fluid in wellblock Jin 72
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| 参数 | 泥岩 | 砂岩 | | 干层 | 水层 | 气水同层 | 气层 | | 自然伽马/API | >78 | ≤78 | ≤78 | ≤78 | ≤78 | | 声波时差/(μs·m-1) | —— | <227 | ≥227 | ≥227 | ≥227 | | 深侧向电阻率/(Ω·m) | —— | —— | ≤20 | 20<LLD≤40 | 40<LLD≤100 |
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Logging identification standards of He 1 member in wellblock Jin 72
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Comparison of predicted curve and measured curve of Jin 91
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The crossplot of vP/vS and impedance of 32 wells inHe 1 member of wellblock Jin 72
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vP/vS inversion plan of He1 section of Jin 72 well area
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The crossplot of vP/vS and impedance of 32 wells in He 1 member of wellblock Jin 72
a—The sampling point is water layer,gas-water layer,gas layer;b—The sampling points are water and gas layers
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Favorable areas of He 1 with high quality reservoir in wellblock Jin 72
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