Hydraulic and thermal controls on gas production from methane hydrate reservoirs

IF 3.7 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Marine and Petroleum Geology Pub Date : 2025-03-11 DOI:10.1016/j.marpetgeo.2025.107378
Kehua You , Peter Flemings , David DiCarlo
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Abstract

This study explores the controls of fluid flow and heat transport on gas production from methane hydrate reservoirs under depressurization. We find that effective water permeability of hydrate-bearing sediments plays a primary role in determining the reservoir response and gas production. Effective water permeability determines the velocity of water flow and the speed of pressure propagation. These propagation speeds give rise to two distinct behaviors of hydrate dissociation, which in turn lead to two distinct regimes of gas production. In reservoirs with high effective water permeability (> 1016 m2 or >10−1 mD), the low-pressure wave propagates rapidly, creating a wide, laterally expansive zone of hydrate dissociation. This large dissociation zone leads to a broad region where free methane gas is released, supporting a high-rate gas production at the wellbore. The hydrate-dissociation zone continuously expands with time until it reaches the lateral edge of the reservoir, enhancing both the gas production rate and the cumulative gas-to-water production ratio. Increased heat conduction further accelerates the gas production rate. Conversely, in reservoirs with low effective water permeability (< 1018 m2 or <10−3 mD), pressure propagation is more restricted, which limits the extent of hydrate dissociation to a narrow interface. This confined dissociation zone results in a significantly lower gas production rate, with minimal increase over time and a declining gas-to-water production ratio. These conclusions are based on a multiphase flow, multicomponent reactive transport numerical model applied to hydrate reservoirs with initial effective permeabilities spanning five orders of magnitude. Our findings highlight the importance of accurately characterizing the effective permeability of hydrate-bearing sediments, particularly in the context of methane hydrate presence and sediment compaction, to assess the viability of gas hydrates as an energy resource.
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来源期刊
Marine and Petroleum Geology
Marine and Petroleum Geology 地学-地球科学综合
CiteScore
8.80
自引率
14.30%
发文量
475
审稿时长
63 days
期刊介绍: Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.
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