Identifying and quantifying gas hydrate by joint analysis of P-wave velocity and resistivity

Tao Liu, Xuewei Liu, Tieyuan Zhu

Research output: Contribution to conferencePaper

Abstract

Gas hydrate residing in pore spaces and fractures are two representative distributions in general sediment settings. Morphology of hydrate distribution is essential for assessing its resource potential, understanding its formation, and determining optimum strategies for exploitation. Based on theoretical modeling, we find that in the case of identical hydrate concentration, fracture-filling gas hydrate-bearing sediments (GHBS) generally exhibit higher resistivity but lower P-wave velocity than those of pore-filling GHBS. As a result, the cross plot of these two properties are strikingly different between two types of GHBS. By comparing the cross plot of field measurements to the theoretical cross plot, we hypothesize that the gas hydrate morphology can be identified, and hydrate saturations can also be estimated. We test and verify the hypothesis using well log data from the second gas hydrate expedition in China. The results show that gas hydrate morphologies are successfully identified by this method, and the estimated hydrate saturations generally conform to the pore-water freshening measurements.

Original languageEnglish (US)
Pages3874-3878
Number of pages5
DOIs
StatePublished - Jan 1 2020
EventSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 - San Antonio, United States
Duration: Sep 15 2019Sep 20 2019

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
CountryUnited States
CitySan Antonio
Period9/15/199/20/19

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Geophysics

Cite this

Liu, T., Liu, X., & Zhu, T. (2020). Identifying and quantifying gas hydrate by joint analysis of P-wave velocity and resistivity. 3874-3878. Paper presented at Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019, San Antonio, United States. https://doi.org/10.1190/segam2019-3215910.1