辽中凹陷JZ20-A构造油气成藏特征

doi:10.11743/ogg20120203

Abstract

Abstract:

The lower 2^nd member and 3^rd member of the Dongying Formation, the 1^st and 3^rd member of the Shahejie Formation are four source rocks in Liaozhong Sag.The latter three are active source rocks,but the lower 2^nd member of the Dongying Formation is immature to lowly mature.The 3^rd member of the Shahejie Formation in the northern subsag of the Liaozhong Sag is the main source rocks for the JZ20-A oilfield.The source rocks in the 3^rd member of the Shahejie Formation are of high organic content and maturity,thus have great potential for hydrocarbon generation.By analyzing the inclusion of the major pay zones in the well JZ20-A,we performed the timing of the hydrocarbon generation and established the hydrocarbon accumulation model in the JZ20-A oilfield.The results indicate that the homogenization temperature of the inclusion is 120-140 ℃. The hydrocarbon charging mainly occurred at 5 Ma ago when the Minghuazhen Formtion was deposited.Hydrocarbon charging also happened at 27 Ma ago when the Dongying Formation deposited.All the reservoirs of JZ20-A oilfield are high in hydrocarbon abundance.The GOI value of the inclusion is above 5%.The characteristics of the hydrocarbon accumulation are relay-type multiple stage hydrocarbon charging,over-pressured shale sealing on both sides and oil/gas accumulation in superimposed multiple layers.

Key words: biomarker, hydrocarbon charging, accumulation model, accumulation characteristics, Liaozhong Sag

CLC Number:

TE122.1

Li Jianping, Guo Yonghua, Zhou Donghong. Characteristics of hydrocarbon accumulation in JZ20-A structure in Liaozhong Sag[J]. Oil & Gas Geology, 2012, 33(2): 174-182.

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Characteristics of hydrocarbon accumulation in JZ20-A structure in Liaozhong Sag

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