Carbonate fracture-cave reservoir prediction with prestack AVO
Chen Jun1,2, Zhang Huquan1,2, Wang Jinxi,12, Wang Hongbin1,2, Chen Fangfang3, Meng Xiangxia1,2
1. Northwest Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Lanzhou, Gansu 730020, China;
2. Key Laboratory of Reservoir Description, CNPC, Lanzhou, Gunsu 730020, China;
3. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
Abstract：There are typical carbonate reservoirs with different types and serious heterogeneity in Yingmai A area, Tarim Basin. Hydrocarbon distribution is irregular in these carbonate reservoirs, which affects oil & gas production increase. Based on geological, logging, and seismic data, we analyze seismic response characteristics of different geo-genetic reservoirs in this paper, and extract seismic attributes to predict carbonate reservoirs. It is found that hydrocarbon in carbonate reservoirs with "bead-like reflection" and "strong flaky-like reflection" could be effectively detected by prestack AVO. Then, based on rock physic methods, fluid substitution modeling is conducted to analyze AVO sensitive attribute to predict hydrocarbon distribution in these two types of carbonate reservoirs. Real drilling data prove that hydrocarbon prediction with prestack AVO obtains good results and has significance for the future well deployment.
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