歧口凹陷古近系天然气藏主要特征

doi:10.11743/ogg20120204

Abstract

Abstract:

Two condensate gas fields,i.e,Banqiao and Qianmiqiao,have been discovered in Qikou Sag.In addition,exploration breakthrough was also made in the Chenghai buried hill and the deep Paleogene in Qikou Sag,indicating good exploration prospect.This paper systematically analyzed the Paleogene natural gas reservoirs in Qikou Sag in terms of petroleum factors including source rocks,reservoirs and cap rocks,and described the key characte-ristics of the gas reservoirs.The result indicates that the natural gas mainly accumulate in the mid-deep strata of Shahejie Formation.The shallow secondary gas reservoirs mainly occur in structural traps.In contrast,the mid-deep gas reservoirs mainly occur in structural-lithologic compound traps.The genetic type of gas is dominated by humus type.The pore space of the reservoir is dominated by pores,with fractures occurring in the mid-deep layers,indicating dual porosity reservoir.Two regional cap rocks developed during the maximum flooding are overpressured and provide favorable preservation condition for gas reservoirs.The gas reservoirs mainly occur in areas with high gas generation intensity and are characterized by late hydrocarbon charging.The hydrocarbon distribution is characteri-zed by"gas in the north and oil in the south"and"oil in the upper interval and gas in the lower interval".

Key words: trap, overpressure, natural gas, Qikou Sag, Huanghua Depression

CLC Number:

TE122

Yu Xuemin, Jiang Wenya, He Bingzhen, Wang Shuxiang, Zou Leiluo, Wang Xiaomin. Characteristics of the Paleogene gas reservoirs in Qikou Sag[J]. Oil & Gas Geology, 2012, 33(2): 183-189.

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Characteristics of the Paleogene gas reservoirs in Qikou Sag

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