本文關鍵詞：基于疊前地震數(shù)據(jù)和巖石物理的游離氣定量估算方法——以印度Krishna-Godavari盆地NGHP01-10A井為例　出處：《地球物理學報》2016年07期 　論文類型：期刊論文

  更多相關文章： 天然氣水合物 巖石物理 AVO 定量估算 游離氣飽和度

【摘要】：天然氣水合物穩(wěn)定帶下方游離氣分布模式、氣體含量及其對水合物富集成藏的指示是水合物研究中的難點,而利用振幅隨偏移距變化(Amplitude Versus Offset,AVO)與巖石物理模型能夠?qū)τ坞x氣含量進行地震定量解釋.我們對印度Krishna-Godavari(K-G)盆地的地震資料進行了疊前保幅處理,在測井數(shù)據(jù)和層位標定的基礎上,基于等效介質(zhì)巖石物理模型和AVO正演模擬定量估算了NGHP01-10A井的游離氣飽和度,發(fā)現(xiàn)水合物下方的游離氣飽和度與其分布模式有關.游離氣呈均勻分布時飽和度為孔隙空間的0.3%~0.4%,而塊狀分布時為3%~4%,該結果與NGHP01-10D實測計算的泊松比交匯分析結果吻合很好.最后再根據(jù)干燥巖石骨架的泊松比反演結果進一步判斷游離氣分布為均勻分布,其飽和度為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，

本文編號：1361322