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Collaborating Authors
Results
Delineating the Gas Reservoir With the C-wave Diodic Effect Correction In Qaidam Basin, Northwest China
Zhang, Sihai (China University of Petroleum) | Li, Xiang Yang (China University of Petroleum) | Dai, Hengchang (British Geological Survey) | Li, Xiaoming (China University of Petroleum) | Yin, Zhiheng (China University of Petroleum)
ABSTRACT The C-wave imaging may be degraded by the diodic effect introduced by the gas cloud though C-waves have been commonly used to image through gas cloud. This diodic effect may be compensated with a velocity perturbation method which decouples the diodic moveout into two parts: the base velocity and the velocity perturbation. In this paper, the velocity perturbation is written with base velocity and the PS velocity of positive and negative offset. And the relation between velocity perturbation and gas reservoir is discussed. A land 2D3C seismic dataset is analyzed from the Sanhu area in the Qaidam basin, northwest China and significant diodic effects are observed in the data. The perturbation approach is applied to this data and the resultant C-wave imaging and the details of the reservoir structure are significantly improved. The characterization of the reservoir boundary using velocity perturbation is well consistent with the real reservoir.
- Geophysics > Seismic Surveying > Seismic Processing (0.34)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.31)
Fracture Detection Using PS Converted Waves – A Case Study From Daqing Oil Field
Dai, Hengchang (British Geological Survey) | Li, Xiang Yang (British Geological Survey) | Ford, Richard (Imperil College London) | Yu, Chenye (PetroChina Daqing Oilfield Limited) | Wang, Jianmin (CNPC Daqing Geophysical Exploration)
ABSTRACT We performed a case study to use PS converted waves for fracture detection for a 3D land dataset. In this study, the azimuthal variation of NMO velocity of PS converted waves is used to detect the fracture properties. The direction of maximum velocity indicates the fracture direction and the velocity perturbation indicates the anisotropy. The stack image when compensated for azimuthal velocity variation showed enhancements in terms of reflection and fault definition. The mapped distribution of the direction of maximum velocity and the velocity perturbation outlined the fracture system of the reservoir and showed a clear trend between the direction of maximum velocity and the Daqing anticline location.
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Yian Formation (0.99)
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Mingshui Formation (0.99)