An experimental study on visual detection of hydrate-bearing sediments based on ERT
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摘要:
基于电阻率响应特征的储层识别和饱和度估算是天然气水合物储层评价的关键技术之一，在天然气水合物的勘探开发中发挥重要作用。本文开展了沉积物内水合物生成的物理模拟实验，采用电阻率层析成像技术，实现了分散状水合物和块状水合物生长过程的可视化探测，研究了两种赋存形态水合物的电阻率响应特征。研究表明：分散状水合物的高值电阻率零散分布，块状水合物的高值电阻率聚集分布；沉积物内的游离气导致块状水合物的电阻率层析成像位置发生偏移；分散状水合物和块状水合物的电阻率响应特征差异明显，与分散状水合物相比，块状水合物电阻率随着水合物的生成升高较快。
Abstract:Reservoir evaluation of gas hydrate based on electrical response, as a key mean to discriminate natural gas hydrate and estimate its resource potential, plays an important role in the exploration and development of natural gas hydrate. The physical simulation experiment for gas hydrate formation in sediments was carried out in this paper to detect the morphology of dispersed hydrate and massive hydrate based on electrical resistivity tomography during the formation of hydrate. The resistivity responses of the two gas hydrate morphology were carefully studied. The results show that the high resistivity of dispersed hydrate has a scattered distribution pattern whereas the high resistivity of massive hydrate distributed in a concentrated pattern. The free gas in sediments may cause the position deviation of massive hydrate. The resistivity response characteristics of dispersed hydrate and massive hydrate change largely. Compared to the dispersed hydrate, the resistivity of massive hydrate increases rapidly with the formation of hydrate.
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