查干凹陷下白垩统含油气系统特征及勘探方向

doi:10.11743/ogg20050317

Abstract

Abstract:

There are two petroleum systems in Chagan sag with the 2^nd member of Bayingebi Formation of the Lower Cretaceous as the major source rocks and the 1^st member of Suhongtu Formation as the major reservoir rocks.In one petroleum system,the source rocks and reservoir rocks are in the same horizon,while in another one,the source rocks are located below the reservoir rocks.Thermal modeling in the basin shows that the source rocks would have become mature by the end of Cretaceous,and hydrocarbon generation and expulsion would have been peaked.Yanshan movement (65 Ma) at the end of Cretaceous has been the crucial period for the petroleum systems.Based on comprehensive analysis of the charging degree of hydrocarbon,migration direction and trapping conditions,it is believed that Maodun intrusion zone and Barun fauh-nose zone are favorable for exploration.

Key words: petroleum system, crucial period, Lower Cretaceous, Chagan sag

CLC Number:

TE112.31

Wang Guoli, Wu Maobing. Characteristics of Lower Cretaceous petroleum system in Chagan sag and exploration direction[J]. Oil & Gas Geology, 2005, 26(3): 366-369.

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Characteristics of Lower Cretaceous petroleum system in Chagan sag and exploration direction

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