基于叠前地震数据和岩石物理的游离气定量估算方法——以印度Krishna-Godavari盆地NGHP01-10A井为例
发布时间:2017-12-31 20:21
本文关键词:基于叠前地震数据和岩石物理的游离气定量估算方法——以印度Krishna-Godavari盆地NGHP01-10A井为例 出处:《地球物理学报》2016年07期 论文类型:期刊论文
更多相关文章: 天然气水合物 岩石物理 AVO 定量估算 游离气饱和度
【摘要】:天然气水合物稳定带下方游离气分布模式、气体含量及其对水合物富集成藏的指示是水合物研究中的难点,而利用振幅随偏移距变化(Amplitude Versus Offset,AVO)与岩石物理模型能够对游离气含量进行地震定量解释.我们对印度Krishna-Godavari(K-G)盆地的地震资料进行了叠前保幅处理,在测井数据和层位标定的基础上,基于等效介质岩石物理模型和AVO正演模拟定量估算了NGHP01-10A井的游离气饱和度,发现水合物下方的游离气饱和度与其分布模式有关.游离气呈均匀分布时饱和度为孔隙空间的0.3%~0.4%,而块状分布时为3%~4%,该结果与NGHP01-10D实测计算的泊松比交汇分析结果吻合很好.最后再根据干燥岩石骨架的泊松比反演结果进一步判断游离气分布为均匀分布,其饱和度为0.3%~0.4%.
[Abstract]:The distribution pattern of free gas below the stability zone of natural gas hydrate , the gas content and the indication of the enrichment of hydrate to reservoir are the difficulties in the research of hydrate , and the free gas saturation under the hydrate can be quantitatively explained by using the amplitude varying offset ( AVO ) and the petrophysical model . The results agree well with the results of the Poisson ' s ratio analysis of the NGHP01 - 10D . Finally , the distribution of free gas is determined to be uniform even though the Poisson ' s ratio inversion results of the dry rock skeleton are distributed uniformly , and the saturation is 0.3 % 锝,
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