天然气水合物含量计算方法研究

STUDY ON THE CALCULATION METHOD OF GAS HYDRATE CONTENT

利用测井和垂直地震剖面法（VSP）获取的P波和S波速度来评价天然气水合物含量，能够计算的天然气水合物的含量可以高达75％，利用垂直地震剖面法（VSP）的P波和S波速度计算的天然气水合物含量的平均值分别为37％和21％，而利用声波测井的P波速度和S波速度计算的天然气水合物的平均含量分别为60％和57％。计算的天然气水合物含量平均值与利用水合物分解模拟以及阿尔奇公式计算的结果非常吻合。利用P波速度评价的结果比利用S波速度的评价结果更加可靠。

P wave and S wave velocity obtained from well logging and vertical seismic profiling(VSP)can be used to estimate the gas hydrate con- tent.The calculable gas hydrate content can reach as high as 75%;the average content calculated with P wave and S wave velocity(VSP)is 37% and 21% for each;the average content calculated with P wave and S wave velocity of acoustic logging is 60% and 57% for each.The calculated average value of gas hydrate content fits well with the result calculated by using the hydrate decomposition model and Archie e- quation.The estimation result with P wave valecity is more reliable than that of S wave velocity.