Carbonate reservoir cave volume estimation with seismic physical simulation
Li Qian1,2, Di Bangrang1,2, Wei Jianxin1,2
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
Abstract：Due to limitation of seismic vertical and horizontal resolution, it is very difficult to estimate cave reservoir volume. The commonly used method is to establish the calibration curve of cave reservoir. But this method is affected by a few complicated factors. Considering different influence factors of cave reservoir, we propose an estimation method of carbonate cave-reservoirs volume based on physical model. According to seismic and geological conditions of the actual carbonate reservoir, a complex three-dimensional physical model is built, which is contained by different overlying structure, different cave size, and different fillings. Then 3D seismic data is processed and seismic attributes of the physical model are chosen. After that, 3D visualization is used to sculpt seismic attribute bodies, so seismic information of cave reservoir is retained. This seismic attribute volume is converted to the volume of actual geologic body. In the end, we obtain the relationship between the seismic attribute volume and the geologic volume. It is found that when the overlying layers are more complex, the bigger cave volume is, the smaller impedance the fillings in it have.
Sun dong, Pan Jianguo, Pan Wenqing et al. Quantitative forward modeling of cavity volume in carbonate reservoirs in Tazhong area. Oil & Gas Geology,2010,31(6):871-878.
Wu Changwu, Xiong Qihua, Wang Zhizhang et al. The carbonate reservoir space prediction and its quality evaluation in central area of Tarim Basin. Xinjiang Petroleum Geology, 2002,23(4):290-292.
Li Jianfeng, Zhao Qun, Hao Shouling et al. Physical modeling of the fracture-cave systems of carbonate reservoirs in Tahe Oilfield.GPP,2005,44(5):428-432.
Liu Xueli, Jiao Fangzheng, Zhai Xiaoxian et al. Reserve calculation for Ordovician fracture-cavity reservoirs in Tahe Oilfield. Special Oil and Gas Reservoirs, 2005,12(6):22-24.
Yang Zichuan,Li Zongjie, Dou Huiyuan. Seismic recognition model analysis and probe of quantitative reservoir prediction technology: Case study of carbonate reservoirs in Tahe Oilfield. GPP, 2007,46(4):370-377.
Dong Ruixia, Han Jianfa, Zhang Yanping et al. Application of fracture-cave quantitative technique for carbonate reservoir of Yingshan formation of lower Ordovician in north slope of Tazhong area,Tarim Basin. Xinjiang Petroleum Geology, 2011,32(3):314-317.
[8]
张进铎.碳酸盐岩储集层体积定量化估算技术.石油勘探与开发,2004,31(4):87-88.
Zhang Jinduo. A method to quantitatively calculate the volume of carbonate reservoirs. Petroleum Exploration and Development, 2004,31(4):87-88.
Liu Xueli and Lu Xinbian. Volume calculation method for fracture-cavity reservoir body in Tahe Oilfield,Tarim Basin. Xinjiang Petroleum Geology, 2010,31(6):593-595.
Liu Yunhong, Liu Yonglei, Lü Dong et al. Application of fracture-cave quantitative technique to reserves study of carbonate reservoir in Tazhong area, Tarim Basin. Xinjiang Petroleum Geology, 2011,32(3):288-290.
Liu Qun, Wang Shixing, Gu Hanming et al. Carbo-nate fracture-cave volume quantitative calculation and its influencing factors analysis: case study of the main area in Tahe Oilfield. GPP, 2013,52(2):217-222.
Li Fanyi, Wei Jianxin, Di Bangrang et al. Formation mechanism research for bead-like seismic reflection of carbonate caves.OGP, 2012,47(3):385-390.
[14]
Li Fanyi, Di Bangrang, Wei Jianxin et al. Volume estimation of the carbonate fracture-cavern reservoir: A physical model study. Expanded Abstracts of 74th EAGE Conference &Exhibition, 2012,A007.
