The resistivity logging technology is an important mean for estimating natural gas hydrate reservoir resources. It is important to determine the relationship between reservoir resistivity and microscopic distribution of hydrate in sediment pores for accurate estimation of hydrate saturation. The methane hydrate formation experiment in porous media was carried out and CT observation and resistivity test was performed based on the independently-developed experimental device with CT-resistivity measurement, and image and resistivity data were obtained during methane hydrate formation. The relationship between resistivity change and hydrate saturation in different microscopic distribution model of methane hydrate was discussed. The experimental results showed that the hydrate distribution was mainly in contacting mode, compared with the filling effect of hydrate on pores, the salt-removing effect was more significant, therefore the resistivity decreased slightly with the increase of the hydrate saturation when the hydrate saturation was lower than 10.50%. The hydrate distribution was between floating and contacting mode, and the hindrance effect of hydrate on the pore-water connected section in the floating distribution mode was greater, so the resistivity increased sharply with the increase of hydrate saturation when the hydrate saturation ranged between 10.50% and 22.34%. When the hydrate saturation was 22.34%-27.50%, the hydrate still in a coexistence distribution mode of floating and contacting; in the case that most of the pores have been clogged, the effect of hydrate on the resistivity was small, hence the rate of resistivity growth reduced as the hydrate saturation increase. It can be seen that the resistivity response characteristics are significantly different under different hydrate saturation ranges, which is related to the microscopic distribution of hydrate
CHEN Guo-qi
,
LI Cheng-feng
,
LIU Chang-ling
,
XING Lan-chang
. Effect of Microscopic Distribution of Methane Hydrate on Resistivity in Porous Media[J]. Advances in New and Renewable Energy, 2019
, 7(6)
: 493
-499
.
DOI: 10.3969/j.issn.2095-560X.2019.06.004
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