Source Supply System and Reservoir Forming Model Prediction of Natural Gas Hydrate in the Deep Water Area of the Northern South China Sea

doi:10.11885/j.issn.1674-5086.2016.09.03.01

Abstract

Abstract: Although differences exist in formation conditions between natural gas hydrate reservoirs and petroleum accumulation, they also have some requirements in common. Both of them need the spatiotemporal coupling configuration between sufficient hydrocarbon source supply, source supply transportation system and favorable gathering places. In order to further study the differences in formation conditions, this paper deeply analyzes the gas sources composition of petroleum and gas hydrate, and the characteristics of fluid migration transporting system, based on the tectonic sedimentary evolution, petroleum geological conditions, and oil, gas and gas hydrate exploration results of the northern South China Sea continental slope areas in the past. In addition, according to the analysis results of geology, geophysics and geochemistry, the space-time coupling configuration relationship between the types of gas migration channel system and the gas hydrate stability zone characterized by high pressure and low temperature are also dissected synthetically. Based on the basic geological conditions of oil/gas and gas hydrate reservoir, three models of natural gas hydrate formation and accumulation in northern slope deep-water area of South China Sea are summarized and established, "biogenic gas accumulated in place by way of self-generation and self-bearing", "thermal gas accumulated offsite through faults and fractures by way of lower-generation and upper storage", and "thermal gas accumulated offsite through mud diapir and gas chimney by way of lower-generation and upper storage". This paper hopes to provide decision-making basis and guidance for the prediction of natural gas hydrate resources and the favorable exploration target evaluation in the deep water area of the northern South China Sea.

Key words: deepwater area of northern South China Sea, gas sources of gas hydrate, gas hydrate stability zone with high pressure and low temperature, mineralization and accumulation model, main controlling factor

CLC Number:

TE132

HE Jiaxiong, LU Zhenquan, SU Pibo, ZHANG Wei, FENG Junxi. Source Supply System and Reservoir Forming Model Prediction of Natural Gas Hydrate in the Deep Water Area of the Northern South China Sea[J]. 西南石油大学学报(自然科学版), 2016, 38(6): 8-24.

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