The Hydrocarbon Source, Accumulation Mechanism and Exploratory Potential of Igneous Reservoir

Abstract

Abstract: The study progresses of igneous petroleum reservoirs at home and abroad are reviewed. The results show that the commercial igneous reservoirs are dominated by those with biogenic hydrocarbons, but inorganic petroleum reservoirs should be paid great attention to. The hydrocarbon source and the mechanism of inorganic hydrocarbon generation of igneous reservoirs are discussed. It is illustrated that primary mantle outgassing, the rebalancing of C-O-H fluid within the closed system in late-magmatic stage of less than 500℃ and the mineral-fluid Fischer-Tropsch (FT) reactions in post-magmatic stage are the main sources of inorganic hydrocarbons. The source rocks in faulted period of basins in eastern China are well developed, with mantle-derived hydrocarbons in regional volcanic mantle inclusions and volcanic spring gas. The combinations of Alkaline-peralkaline granites and basic/ultrabasic igneous rocks are of suitable for FT reactions. These indicate that igneous reservoirs have huge potentials for petroleum exploration.

Key words: igneous reservoir, inorganic genesis, organic origin, Fischer-Tropsch reaction, hydrocarbon accumulation mechanism

CLC Number:

TE112.222

MENG Fan-chao, LIU Jia-qi, LI Ming, ZHANG Nian-fu, CUI Yan. The Hydrocarbon Source, Accumulation Mechanism and Exploratory Potential of Igneous Reservoir[J]. Xinjiang Petroleum Geology, 2010, 31(1): 102-106.

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