利用声波资料计算天然气水合物饱和度的可靠性实验

发布时间：2018-11-21 17:51

【摘要】：为了探讨利用声波速度数据计算天然气水合物(以下简称水合物)饱和度的可靠性,通过岩石物理实验测量非固结砂泥沉积物中水合物生成过程中的纵、横波速度及其变化值;利用物质平衡方程,结合pVT状态方程及其测试条件,建立了实验过程中水合物饱和度的计算模型;在此基础上,分析了非固结沉积物声波速度随水合物饱和度增加的变化规律,利用修正的Lee权重声波公式,计算了水合物的饱和度,并与实验得到的饱和度数据进行了比较。研究结果表明:(1)在水合物含量达到一定程度的情况下,可以利用声波资料计算水合物的饱和度;(2)随着沉积物中水合物含量的不断增加,非固结砂泥沉积物的纵、横波速度也随之增大,二者之间具有较好的线性相关性;(3)利用声波资料计算所得的水合物饱和度数值与实验室测试得到的结果可比性较高、误差较小。结论认为,该研究成果为利用实际声波测井资料计算水合物的饱和度提供了依据。
[Abstract]:In order to discuss the reliability of calculating the saturation of natural gas hydrate (hereinafter referred to as hydrate) by using acoustic velocity data, the longitudinal and shear wave velocities and their variation values in the process of hydrate formation in unconsolidated sand and mud sediments were measured by rock physics experiments. Based on the mass equilibrium equation, pVT equation of state and its test conditions, the calculation model of hydrate saturation in the experiment is established. On this basis, the variation of acoustic velocity of unconsolidated sediment with the increase of hydrate saturation is analyzed, and the saturation of hydrate is calculated by using the modified Lee weighted acoustic wave formula, and compared with the experimental saturation data. The results show that: (1) when the hydrate content reaches a certain degree, the saturation of hydrate can be calculated by using acoustic data; (2) with the increase of hydrate content in sediments, the longitudinal and shear wave velocities of unconsolidated sand sediments increase, and there is a good linear correlation between them. (3) the value of hydrate saturation calculated by acoustic wave data is comparable with the results obtained by laboratory test, and the error is small. It is concluded that the research results provide a basis for the calculation of hydrate saturation using actual acoustic logging data.
【作者单位】：西南石油大学地球科学与技术学院;
【基金】：国家重点研发计划项目“海洋水合物固态流化测试新技术”(编号:2016YFC0304008)
【分类号】：P618.13

【相似文献】