贵州麻江古油藏成藏期次

doi:10.11743/ogg20120311

Abstract

Abstract:

Majiang paleo-oil reservoir is one of the largest marine paleo-oil reservoirs in South China.There is debate about its forming time.This paper investigates the hydrocarbon accumulation period by analyzing the geochemical characteristics and genesis of reservoir-bitumen.The study shows that the distribution of n-alkanes of saturated hydrocarbon chromatogram from the reservoir-bitumen is complete,but the base line is up convex,and 25-norhopane exists.It indicates that crude oil charging occurred at least in two stages in this paleo-oil reservoir.The reservoir-bitumen in Ordovician and Devonian originated from the same source rocks,indicating that the massive crude oil charging occurred after deposition of the Devonian.Reservoir-fluid inclusion thermometry and K-Ar dating of autogenous illite,in combination with thermal history of source rocks,were used to investigate the hydrocarbon accumulation phases.The results shows that Majiang paleo-oil reservoir experienced small-scale hydrocarbon accumulation and damage during the Late Caledonian time,large-scale hydrocarbon accumulation during the Hercynian time,oil-gas conversion in the IndoChinese time,and large scale damage during the Yanshan time, and the Hercynian time is suggested as the main accumulation stage of Majiang paleo-oil reservoir.

Key words: reservoir-bitumen, geochemistry, hydrocarbon accumulation phase, Majiang paleo-oil reservoir, Guizhou, South China

CLC Number:

TE122.1

Gao Bo, Wo Yujin, Zhou Yan, Peng Yongmin, Liu Quanyou, Li Shuangjian. Hydrocarbon accumulation phases of Majiang paleo-oil reservoir in Guizhou[J]. Oil & Gas Geology, 2012, 33(3): 417-423.

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Hydrocarbon accumulation phases of Majiang paleo-oil reservoir in Guizhou

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