Application of frequency-dependent AVO inversion to identify fluid in fractured carbonate reservoirs in the Shunnan area
QIN Xilin1,2, LI Xiangyang1,2, CHEN Shuangquan1,2, SUN Saohan3, LI Zongjie4, LIU Jun4
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 3 BGP Research & Development Center of CNPC, Zhuozhou 072750, China 4 Research Institute of Exploration and Development, Northwest Oilfield Branch of Sinopec, Urumqi 830000, China
Carbonate reservoirs in the Shunnan area are the key target for natural gas exploration and development in the Tarim Basin. Fluid identification is an effective method to improve exploration efficiency. Therefore, this paper combines a multi-scale fractured rock physical model and frequency-dependent amplitude vs offset (AVO) inversion method to establish a set of fluid detection technologies. Firstly, based on the drilling, logging, seismic, and geology data, we use the Chapman equivalent model to simulate the fractured reservoirs in the Shunnan area, and use the reflectivity method for forward modeling the seismic wave response feature of reservoirs saturated with different types of fluids. Secondly, it is necessary to carry out seismic attribute sensitivity analysis of different types of reservoir to determine which seismic dispersion is more sensitive to fluid. Finally, based on the situation of seismic data in the study area, we establish a technical process based on the petrophysical model and the frequency-dependent AVO inversion, and apply it in the Shunnan area. The results of fluid detection and real drilling verification show that the method proposed in this paper is practical and provides a method for fluid detection in this type of oil and gas reservoir.
秦喜林,，李向陽，陳雙全,，孫紹寒,，李宗杰，劉軍. 頻變AVO反演在順南地區(qū)碳酸鹽巖裂縫型儲層流體識別中的應用[J]. 石油科學通報, 2017, 2(3): 344-354. QIN Xilin, LI Xiangyang, CHEN Shuangquan, SUN Saohan, LI Zongjie, LIU Jun. Application of frequency-dependent AVO inversion to identify fluid in fractured carbonate reservoirs in the Shunnan area. Petroleum Science Bulletin, 2017, 2(3): 344-354.
