准噶尔盆地哈拉阿拉特山地区风城组烃源岩的发现及石油地质意义

doi:10.11743/ogg20130201

Abstract

Abstract:

The petroleum geological conditions are very complex in the northern margin of the Junggar basin,imposing great challenges to petroleum exploration.Based on the research of the tectonic attribute,stratigraphic distribution and exploration potential of the basin recently,it is concluded that the sedimentary environment in the Early Permian was an semi-enclosed remnant sea that was formed on the background of rifting and extensional tectonics movements and associa-ted with volcanic activity,providing favorable conditions for the deposition of high-quality source rocks.Influenced by the tectonic movements of the Late Hercynian and Indosinian,the Hashan thrusted towards to the basin,resulting in the superimposition of multi-phase thrust nappes in the Lower Permian and extensive uplifting and erosion of the Upper Per-mian.As a result,the present boundary of the basin is significantly smaller than that of the depositional period.The structure interpretation model of thrust nappe and later strike-slip of Hala'alt is established with the technology of fault-fold structural analysis.Source rocks of the Fengcheng Formation are identified in the Hala'alt nappe structure belt.And it is believed that the source rocks can extend northward to the Daerbute fault,enlarging the distribution area of source rocks by 1 000 km².The source rocks have high organic content and moderate thermal maturity,and their oil-source correlation reveals that the oil in the Cretaceous,Jurassic,Permian and Carboniferous all are derived from this set of source rocks.The identification of this source sequence underlying the Lower Permain thrust nappe enlarges the area of exploration and even is of great significance for hydrocarbon exploration in the whole northern Junggar Basin.

Key words: structure geological model, basin nature, Fengcheng Formation, Permian, Hala'alt area, northern margin of Junggar Basin

CLC Number:

TE121.1

Zhang Shanwen. Identification and its petroleum geologic significance of the Fengcheng Formation source rocks in Hala'alt area,the northern margin of Junggar Basin[J]. Oil & Gas Geology, 2013, 34(2): 145-152.

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Identification and its petroleum geologic significance of the Fengcheng Formation source rocks in Hala'alt area,the northern margin of Junggar Basin

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