Natural Gas Geoscience ›› 2010, Vol. 21 ›› Issue (6): 875-881.doi: 10.11764/j.issn.1672-1926.2010.06.875

• article •     Next Articles

Effect of Structural Evolution on the Formation and  Distribution of Upper Paleozoic Giant Gas Fields in the East Ordos Basin

ZHAO Jing-Zhou, WANG Li, SUN Bing-Hua, BAI Yu-Ban, WU Wei-Tao   

  1. School of Petroleum Resources,Xi‘an Shiyou University,Xi′an 710065,China
  • Received:2010-10-31 Revised:2010-11-15 Online:2010-12-10 Published:2010-12-10

Abstract:

Upper Paleozoic structure in the east part of Ordos basin as a large smooth westward monocline was characterized by simple structure short of folds and faults.Accumulation and distribution of natural gas in the upper Paleozoic in Yulin area was mainly controlled by sedimentary facies,and the types of gas reservoir were regarded as lithologic type.Nevertheless,the structural evolution suggested that the Yulin region has experienced 3 structural stages,i.e.level structure in middle Triassic,paleo\|uplift in late Triassic to early Cretaceous,and monoclinal slope in late Cretaceous to present.The paleo-uplift of upper Paleozoic was probably formed through the Indosinian movement in late Triassic,intensified by the early Yanshanian movement in the end of early Cretaceous and reformed by the Himalayan movement in the Cenozoic.The formation and development of this paleo-uplift coincided with time of peak generation and expulsion of hydrocarbons from Carboniferous and Permian source rocks.Thus,the paleo\|uplift became the most favorable area for natural gas accumulation.The giant gas fields of Yulin and Daniudi were distributed at paleo\|uplift and its surroundings,inferring that the formation and occurrence of giant gas fields would be controlled by the paleo\|uplift.But the present local structures have little or even no effect on the distribution of the giant fields.On the contrary,we found out that the Upper Paleozoic natural gas fields in the Ordos Basin would be continuous tight gas accumulations,which are characterized by widespread hydrocarbon generation,vaporizing\|like expulsion,short-distance migration and pervasive distribution.Recognition of continuous tight gas accumulation in the Ordos basin may give a greater resource volume and a bigger exploration potential in this basin.

Key words: Ordos basin, Structural evolution, Upper Paleozoic, Yulin gas field, Tight gas, Gas accumulation.

CLC Number: 

  • TE122

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