青藏高原冻土区天然气水合物地层的岩石物理分析

发布时间：2018-03-04 15:30

  本文选题：水合物地层　切入点：物性参数　出处：《地球物理学进展》2017年03期 　论文类型：期刊论文

【摘要】：为了获得青藏高原冻土区天然气水合物地层的物性特征,采用岩石物理方法进行分析.首先,对青藏高原冻土区DK-1、DK-3和DK-4三个井孔制作了速度密度交会图,并比较了不同岩性水合物地层的差异.其次,基于DK-1和DK-4含水合物粉砂岩层段的测井数据,提取了水合物地层骨架的物性参数,包括纵波速度、横波速度、密度、体积模量和剪切模量.最后,依据水合物地层各主要成分的物性参数,建立了基于K-T方程的岩石物理模型和区分填充模式的岩石物理模型,将两类模型的速度曲线分别与实际地层数据进行了对比,并分析了模型与实际地层的近似程度,发现填充模式Ⅱ的水合物岩石物理模型更符合实际情况.冻土区水合物地层具有速度大、密度小的特征,砂岩水合物地层相比泥岩地层在速度和密度方面更具规律性,DK-4井孔165.80~166.35 m层段中水合物作为岩石骨架的一部分更能反映其物性特征.
[Abstract]:In order to obtain the physical characteristics of gas hydrate formation in the frozen soil area of the Qinghai-Tibet Plateau, the petrophysical method is used to analyze it. Firstly, the velocity density cross plot of three boreholes DK-1DK-3 and DK-4 in the frozen soil region of the Qinghai-Xizang Plateau is made. Secondly, based on the logging data of DK-1 and DK-4 hydrate bearing silt strata, the physical parameters of hydrate formation skeleton, including P-wave velocity, S-wave velocity, density, are extracted. Volume modulus and shear modulus. Finally, the rock physical model based on K-T equation and the rock physical model of distinguishing filling model are established according to the physical parameters of the main components of hydrate formation. The velocity curves of the two kinds of models are compared with the actual formation data, and the approximate degree between the model and the actual formation is analyzed. It is found that the physical model of hydrate rock in filling mode 鈪，

本文编号：1566257