--> Abstract: Huimin Petroleum System in Bohai Gulf Basin, East China, by Zicheng Yang and Jinliang Zhang; #90078 (2008)

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Huimin Petroleum System in Bohai Gulf Basin, East China

Zicheng Yang and Jinliang Zhang
College of Marine Geosciences, Ocean University of China, Qingdao, China

Huimin depression is located in the west of Bohai gulf basin. Huimin depression includes Linnan sag, Zizhen sag, Lizezhen sag, Yangin sag and central uplift. The source rocks are lower Es3 and upper Es4 member of the Eocene Shahejie Formation. Total organic organic carbon content, kerogen type and thermal maturation indicate that abundant mature source rocks are present in the Linnan sag and Yangxin Sag. Huimin petroleum system consists of two major hydrocarbon system, such as Linnan and Yangxin petroleum system.

The expelled petroleum migrated updip to nearby faulted, anticlinal traps, where much of oils migrated across faults to the Es4 Formation. Oil-source correlation in the Huimin depression indicated that most of the liquid originated from the lower Es3 and upper Es4 member. Some immature oils which is from the source rock of lower Es3 member are found in the Es4 reservoir of central uplift.

The critical moment is in Miocene phase about 6Ma and the late Oligocene phase about 30Ma. The first filling period occurred in the late Oligocene phase. At that time the amount of oil and gas accumulations was limited and most of petroleum formed in the early trap of deeper zones. Because of the Himalayan movement, the Huimin Depression were uplifted regionally and eroded away, the early petroleum were biodegradated. The second filling phase took place in the Miocene phase. Most of source rocks accessed the threshold of oil generation.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas