关键词: 碳酸盐岩, 缝洞型储层, 叠前深度偏移, 定量雕刻, 各向异性分析, 弹性反演, 塔里木盆地

Abstract: Ordovician carbonate fracture-vuggy reservoirs are well developed in Halahatang area. The crack-cave distribution is mainly affected by faults and paleo-water systems. The oil layer is thin, and water bodies are active. The fracture-vuggy reservoirs feature in different scale, irregular spatial distribution, and various filling properties. It is difficult to accurately describe the spatial location of carbonate fracture-vuggy reservoir, the volume of fracture-vuggy reservoir, and oil-gas-water distribution in carbonate reservoir exploration and development. With the support of high-density and wideazimuth seismic acquisition, this paper puts forward such predicting methods as the prestack depth migration, the quantitative characterization combining forward and inversion, the prestack anisotropy analysis, and the prestack elastic inversion. Field application of practical seismic data shows that prestack depth migration could accurately characterize the spatial location of fractured body; prestack anisotropy analysis could effectively predict fracture density and direction; the prestack elastic inversion combined with well data could predict the spatial form of fractured reservoir and the oil and gas condition of the reservoir. The application of various means effectively solves the problems in study on carbonate fracture-vuggy reservoirs, and provides powerful supports for well deployment in the carbonate reservoir exploration and development in Halahatang area

Key words: carbonate, fracture-vuggy reservoir, prestack depth migration, quantitative characterization, anisotropy analysis, elastic inversion, Tarim Basin