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Confirmation of AVO Attribute Inversion Methods for Gas Hydrate Characteristics Using Drilling Results from the Shenhu Area, South China Sea
Pure and Applied Geophysics ( IF 2 ) Pub Date : 2021-01-25 , DOI: 10.1007/s00024-020-02653-3
Xudong Zhang , Cheng Yin , Gulan Zhang

Amplitude versus offset (AVO) attribute inversion can help to constrain lithologies and interpret oil and gas accumulations. In this paper, we simulate four different gas hydrate and free gas configurations through AVO forward modeling. When there is no free gas under gas hydrate, the AVO attribute characteristics of gas hydrate are only related to the saturation of gas hydrate. When there is free gas under gas hydrate, if the gas hydrate saturation is high, the AVO attribute characteristics [such as the product of intercept (P) and gradient (G)] are not sensitive to identify gas hydrate. Otherwise, the AVO attribute characteristics are sensitive for identifying gas hydrate, but greatly affected by free gas. The results of this paper constrain the distribution of gas hydrate in the Shenhu area and provide a basis for future gas hydrate exploration.

中文翻译:

南海神狐海域钻井结果证实天然气水合物特征AVO属性反演方法

振幅与偏移距 (AVO) 属性反演可以帮助约束岩性并解释油气聚集。在本文中,我们通过 AVO 正向建模模拟了四种不同的天然气水合物和游离气配置。当天然气水合物下无游离气体时,天然气水合物的AVO属性特征仅与天然气水合物的饱和度有关。当天然气水合物下存在游离气时,如果天然气水合物饱和度较高,AVO属性特征[如截距(P)和梯度(G)的乘积]对天然气水合物识别不敏感。否则,AVO 属性特征对识别天然气水合物较为敏感,但受游离气影响较大。研究结果制约了神狐地区天然气水合物的分布,为今后天然气水合物勘探提供依据。
更新日期:2021-01-25
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