The Expulsion Hydrocarbon Periods of Source Rock by Release of Over Pressure—An example of Qingshankou formation in Gulongsag

Abstract

Abstract: By means of expulsion hydrocarbon mechanism of overpressure source rock, the method for release periods or times of overpressure is presented by interval transit time, obtaining that the overpressure of Qingshankou formation in Gulong sag in Songliao basin was ever released for three times. They are the end period of k1n, the middle-late period of k1n4 and the end period of k2m, and it is now in the fourth evolution process of overpressure. By comparison of these overpressure release periods with periods of oil threshold of k1qn source rock, the end period of k2m sedimentation is considered to be main expulsion hydrocarbon period of overpressure source rock of k1qn. This coincides with the periods of hydrocarbon accumulation in Saertu, Putaohua and Gaotaizi reservoirs in Daqing oilfield, indicating that the oil and gas expulsion from the overpressure source rock of Qingshankou formation were favorable to accumulate in large scale into these reservoirs. It is one of important conditions to form Daqing oilfield.

Key words: Songliao basin, Gulong sag, overpressure, source rock, hydrocarbon expulsion

CLC Number:

TE121.1

FU Guang, WANG You-gong, SU Yu-ping. The Expulsion Hydrocarbon Periods of Source Rock by Release of Over Pressure—An example of Qingshankou formation in Gulongsag[J]. Xinjiang Petroleum Geology, 2007, 28(5): 538-541.

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