APPLICATION OF PRE-STACKING AVO INVERSION IN YUANBA AREA, NORTHEASTERN SICHUAN
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摘要: 川东北元坝地区二叠系长兴组礁滩储层的油气、水系统相对复杂,钻遇水层或气水同层的情况时有发生,所以探索出一种有效的储层识别技术具有非常重要的意义。通过对井中储层段的流体类型进行物性分析研究,得出了该区含气层、气水同层、水层及非储层的地球物理响应特征;含气层、气水同层都具有泊松比值、λρ(拉梅系数λ与密度ρ的乘积)值较非储层值低的特点。利用AVO反演技术对该区礁滩储层进行反演,得到相应的泊松比、λρ数据体。利用反演所得到的泊松比、λρ成果预测了元坝地区长兴组礁滩储层的含气有利分布范围,预测结果和该区测井资料吻合度较高。结论表明,采用AVO反演技术进行海相礁滩储层识别具有重大现实意义。Abstract: The oil-gas-water system is rather complicated in the reef bank reservoir of the Changxing Formation of Permian in the Yuanba region of northeastern Sichuan. It is quite often to encounter water reservoirs or gas-water mixed reservoirs in drilling. It is highly required to develop a technique to effectively distinguish gas reservoirs from non-reservoirs. Based on the physical properties of different types of fluid, we studied the geophysical responding characteristics of gas reservoir, gas-water reservoir, water reservoir and non-reservoir respectively. It is found that the Poisson ratio and λρ in gas and gas-water mixed reservoirs are simply lower than those in non-reservoirs. Using the AVO inversion technique for inversion processing, we obtained the Poisson ratio and λρ of the reef bank deposits. And then the Poisson ratio and λρ were used to predict the distribution of gas in the Reef bank reservoir of the Changxing Formation in the region. The results of prediction fit well with the drilling data. Therefore, the AVO pre-stacking inversion technique could be promoted to similar marine reef bank reservoirs.
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Key words:
- reef reservoir /
- AVO inversion /
- reservoir recognition /
- Changxing Formation /
- northeastern Sichuan
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[1] Geotechnology
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