Analysis of Gas Hydrate Absence Induced by the Latestage Diapir  Domination in the Borehole SH5 of Shenhu Area

Abstract

Abstract:

There is a close relationship between mud diapirs and occurrences of gas hydrates in the marine sediments. While mud diapirs provide gas hydrates with abundant source material, they control gas hydrates occurrences by disturbing the thermal field. Borehole SH5 located in the Shenhu working area in the northern South China Sea shows a clear BSR in the seismic profile, but it turns out to be a sediment lack of gas hydrates by the evidence of borehole sampling. The thermal field moves upwards with higher equilibrium temperatures in the borehole SH5 below which a mud diapir and associated faults are approaching. Based on the facts above and the mud diapirs evolution in each stage, a model is proposed that the occurrence of gas hydrates is very likely to be under the control of mud diapirs in this site. During the early and intermediate stages of mud diapir growth, organic gases with low thermal conductivity and low thermal energy are converted into gas hydrates at the bottom of gas hydrate stability zone. In the late stage of mud diapir growth, fluid with high thermal energy invading the bottom of gas hydrate stability zone, makes the gas hydrate disintegrated. Then the librated free gases will move along the sediment strata and be condensed into gas hydrates again when temperature and pressure favor their formation. The borehole SH5, probably too close to a latestage mud diapir, captures no gas hydrate.

Key words: mud diapir, gas hydrate, Shenhu area, the South China Sea

CLC Number:

P744.4

WANG Li-Feng, SHA Zhi-Bin, LIANG Jin-qiang, LIU Jing-An. Analysis of Gas Hydrate Absence Induced by the Latestage Diapir Domination in the Borehole SH5 of Shenhu Area[J]. Geoscience, 2010, 24(3): 450-456.

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Analysis of Gas Hydrate Absence Induced by the Latestage Diapir Domination in the Borehole SH5 of Shenhu Area

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