The Research and Application of Bright Spot Quantitative Interpretation in Deepwater Exploration
- 1 Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang, China
- 2 Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang, China
- 3 Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang, China
- 4 Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang, China
- 5 Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang, China
Abstract
Prospectors usually recognize the event with strong amplitude in seismic sections as bright spots. However, such a simple and rough method can’t distinguish whether these bright spots are related to favorable gas layer or water layer directly. In this paper, for the high correlation between reservoir gascontent and amplitude anomaly in research area, based on rock physical analysis of the wells drilled, using forward modeling technique respectively simulates and analyzes the seismic amplitude of gas layer and water layer. Then, combining the simulation result with corresponding statistics amplitude obtains the numerical relationship between each layer amplitude. At last, using the display technique directly recognizes the bright spots of gas layer in seismic profile and gets rid of those false bright spots caused by water layer, which improved the robustness in the bright spots interpretation and provided reliable basis for reducing exploration risks. Moreover, applying the method to the target zone, we obtain huge success.
- Fu, C.F. (1975) “Bright Spot” Technology—The Method of Directly Searching Oil and Gas by Using Seismic Profile. Oil Geophysical Prospecting, 10, 9-34.
- Calculating Station of Chengdu Institute of Geology, et al. (1977) “Bright Spot” Model Technique. Geophysical Prospecting for Petroleum, 4, 46-53, 55-62.
- Wang, L.Q. (1984) The Bright Spot in Traditional Seismic Profile. Oil Geophysical Prospecting, 19, 80-86.
- Wang, D.C. (1982) The Detection Effect of Bright Spot in Continental Facies Strata. Oil Geophysical Prospecting, 17, 30-35.
- The Intelligence Department of Geophysical Prospecting Bureau of China Petroleum (1975) The Warning of Bright Spot—There Is Not Really without Mistake. Oil Geophysical Prospecting, 2, 40-41.
- Almoghrabi, H., et al. (1986) Layers & Bright Spots. Geophysics, 51, 699-709. https://doi.org/10.1190/1.1442123
- Pan, Y.J. (1988) The Relationship between Bright Spot, Dark Spot and Oil-Gas. Oil Geophysical Prospecting, 6, 737-744.
- He, Z.H. and Ma, C.D. (1989) The Feasibility of Finding Gas by “Bright Spot” in Junggar Basin, Xinjiang Petroleum. Geology, 10, 14-23.
- Yang, Y.L., Sun, H.F. and Wang, H.Z. (1991) The Research on Bright Spot and Its Application of Shallow Gas Exploration in the Dongying Sag. Geophysical Prospecting for Petroleum, 1, 39-49.
- Wang, Y.J. and Wang, X.M. (1995) The Feature and the Recognition of Bright Spot Gas Reservoir in the 3-D Seismic Data of Jiyang Depression. Geophysical Prospecting for Petroleum, 4, 66-72.
- Wei, W., Li, H.M., Yang, Y.L., et al. (2011) The Recognition Technique of True and False Bright Spot in the Shallow of Chenjiazhuang Area. Reservoir Evaluation and Development, 1, 12-15.
- Zhao, S. and Gao, Q. (2013) Using Adjacent Seismic Reflection Characteristics of the Energy Mix to Exclude “Bright Spot” Trap—Taking Deyang Syncline in Western Sichuan Depression as an Example. Natural Gas Geoscience, 24, 1253-1259.
- Liu, W. and Cao, S.Y. (2015) Identification of Gas Reservoir Related with Bright Spots and Thin-Bed Tuning. Oil Geophysical Prospecting, 50, 678-683, 705.
- Zhu, H.T., Hu, X.Q. and Chen, X.J. (2002) Preliminary Study on the Application of Bright Spots Oil and Gas Testing Technique. Offshore Oil, 3, 27-32.
- Li, S.E., Zhang, Y.Z. and Wen, Y.J. (2003) Shallow Formation Bright Spot and Gas Exploration. Natural Gas Geoscience, 14, 291-294.