Abstract：The Karst fracture-cave body (FCB) is the most important drilling target in Tarim carbonates. The influence of the FCB on reflection characteristics merits great efforts of research. The early research efforts usually focused on a single factor influence. Using numerical simulation based on acoustic wave equation, we discuss in this article many influence factors including location, shape, porosity, inner structure, etc. It is confirmed that the main influence factors on reflection amplitude are FCB's width, total porosity, and inner structure. Therefore, it is believed that quantitative reservoir characterization and porosity volume calculation are more practical than separate estimations of the porosity and the bulk volume.
Zhou Xinyuan, Yang Haijun, Han Jianfa et al. Cases of discovery and exploration of marine fields in China (Part 12): Lunnan Ordovician oil-gas field in Tarim basin. Marine Origin Petroleum Geology, 2009, 14(4): 67-77.
Ye Yong, Yang Zixing, Li Pei et al. Numerical simu-lation and seismic recognition of carbonate Karst cave. Natural Gas Industry, 2007, 27(3): 43-45.
[4]
姚姚. 菲涅耳带与洞缝型油气藏地震波场. 石油物探, 2005, 44(5): 491-494.
Yao Yao. Fresnel zone and seismic wave field in the fracture-vug reservoir. GPP, 2005, 44(5): 491-494.
[5]
吴俊峰, 姚姚, 撒利明. 碳酸盐岩特殊孔洞型构造地震响应特征分析. 石油地球物理勘探, 2007, 42(2): 180-185.Wu Junfeng, Yao Yao and Sa Liming. Analysis on seismic response of special cavernous structure of carbonate. OGP, 2007, 42(2): 180-185.
Huang Chengyi, Zou Shengzhang, Pan Wenqing et al. Structure pattern of rift-cavity oil-gas pool in carbonate rock under moist paleo-environment: a case study on the Ordovician in Tarim basin. Carsologica Sinica, 2006, 25(3): 250-255.
[8]
Yang P, Liu Y L, Li H Y et al. Fractured-vuggy reservoir characterization of carbonate, Tarim Basin, Northwest China. 73rd EAGE Conference and Exhibition, Vienna,Austria,2011.
[9]
Loucks R G. A review of coalesced, collapsed-paleocave systems and associate duprastratal deformation. Acta Carsologica, 2007, 36(1): 121-132.
[10]
张永刚. 地震波场数值模拟方法. 石油物探, 2003, 42(2): 143-148.
Zhang Yonggang. On numerical simulations of seismic wavefield. GPP, 2003, 42(2): 143-148.
[11]
Berenger J A. Perfectly matched layer for the absorption of electromagnetic waves. Journal of Computational Physics, 1994, 114(2): 185-200.
