--> Abstract: Forming Mechanisms and Characteristics of Abnormal Pressure in Junggar Basin, by Jiangxiu Qu and Ming Zha; #90039 (2005)

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Forming Mechanisms and Characteristics of Abnormal Pressure in Junggar Basin

Jiangxiu Qu and Ming Zha
University of Petroleum, east China, Dong Ying, China

Junggar basin is one of the largest oil-bearing basins in northwest of China, riching in hydrocarbon resources. Due to differences in tectonism and sedimentation, Junggar basin developed multiple types of abnormal pressure. According to their forming mechanisms, we divided the abnormal pressure systems of the whole basin into four types. In center of the basin, diagenesis is the key factor resulting in overpressure. The investigation showed that the top of the overpressure system was sealed by higher contents in carbonate and silicon. In the south, rapid sedimentation and disquilibrium compaction controlled development of abnormal high pressure. In east of the basin, strong lateral compressive stress from Bogeda Mountain not only formed many fault block oilfields, but also brought on overpressure. Above the rest, we found abnormal low pressure in Junggar basin for the first time. Different from wide distribution of abnormal high pressure, low pressure is mainly limited in Wucaiwan Depression in front of Kelameili Mountain. This low-pressure belt is related to deep geosyncline of foreland basin in Carboniferous and Permian Period.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005