發(fā)布時(shí)間：2018-03-04 15:30

  本文選題：水合物地層　切入點(diǎn)：物性參數(shù)　出處：《地球物理學(xué)進(jìn)展》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：為了獲得青藏高原凍土區(qū)天然氣水合物地層的物性特征,采用巖石物理方法進(jìn)行分析.首先,對(duì)青藏高原凍土區(qū)DK-1、DK-3和DK-4三個(gè)井孔制作了速度密度交會(huì)圖,并比較了不同巖性水合物地層的差異.其次,基于DK-1和DK-4含水合物粉砂巖層段的測(cè)井?dāng)?shù)據(jù),提取了水合物地層骨架的物性參數(shù),包括縱波速度、橫波速度、密度、體積模量和剪切模量.最后,依據(jù)水合物地層各主要成分的物性參數(shù),建立了基于K-T方程的巖石物理模型和區(qū)分填充模式的巖石物理模型,將兩類(lèi)模型的速度曲線(xiàn)分別與實(shí)際地層數(shù)據(jù)進(jìn)行了對(duì)比,并分析了模型與實(shí)際地層的近似程度,發(fā)現(xiàn)填充模式Ⅱ的水合物巖石物理模型更符合實(shí)際情況.凍土區(qū)水合物地層具有速度大、密度小的特征,砂巖水合物地層相比泥巖地層在速度和密度方面更具規(guī)律性,DK-4井孔165.80~166.35 m層段中水合物作為巖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，

本文編號(hào)：1566257