Restoration of Eroded Thickness of the Neogene Strata in the Western Qaidam Basin and Its Significance for Oil and Gas Occurrence

During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraphic profile comparison method and plane trend surface restoring method; then, accura...

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Bibliographic Details
Published in:Acta geologica Sinica (Beijing) 2017-08, Vol.91 (4), p.1352-1362
Main Authors: SUN, Ping, GUO, Zeqing, HE, Wenyuan, LIU, Weihong
Format: Article
Language:English
Subjects:
Accumulation
Basins
Distribution
distribution characteristics
eroded thickness
Erosion
Evolution
Fields
Gas fields
History
Methods
Natural gas
Neogene
Oil and gas fields
Pleistocene
Reflectance
Restoration
restoration method
significance for oil and gas occurrence
Strata
Stratigraphy
Thickness
western Qaidam Basin
地层剥蚀厚度
大中型油气田
恢复方法
新近系
柴达木盆地西部
油气赋存
盆地构造演化
镜质体反射率
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Summary:During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraphic profile comparison method and plane trend surface restoring method; then, accurate calculation of erosion was recovered using vitrinite reflectance, and the erosion that was restored by the trend surface restoring method was corrected; finally, a distribution map of cumulative erosion was produced. This study marks an important achievement in that one of the most important parameters of basin tectonic evolution, sedimentary evolution, and oil and gas accumulation history has been obtained, and that a basic geological problem has been solved in the Qaidam Basin. The areas with high erosion and low erosion are shown in the map and a close relation between the distribution of oil and gas fields and erosion was recognized. Large and medium oil and gas fields are mainly distributed in areas with medium and low erosion. It is difficult to form large-scale oil and gas accumulation in areas in which erosion is more than 2000 m. The mechanism of the relation between oil and gas distribution and erosion is explained. This study will be of use in predicting the distribution of oil and gas.
ISSN:1000-9515
1755-6724
DOI:10.1111/1755-6724.13366