Lithologic Reservoirs ›› 2010, Vol. 22 ›› Issue (2): 79-83.doi: 10.3969/j.issn.1673-8926.2010.02.014

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Sedimentary system and hydrocarbon enrichment of Yanchang Formation in southern Ordos Basin

LI Shichun1,FENG Chaorong2,YIN Shijiang3   

  1. 1.No.2 Oil Production Plant,Changqing Oilfield Company,PetroChina,Qingyang745100,China; 2.XingtaiPolytechnic College,Xingtai 054035,China;3.Well TestingCompany.Great WallDrilling & Exploration En~needng Corp.Ltd.,PetroChina,Beijing 100101,China
  • Online:2010-06-15 Published:2010-06-15

Abstract:

Based on the analysis of hish resolution sequence stratigraphy of Yanchang Formation in southern Ordos Basin,Yanchang Form ation is divided into five long-term cycles and 22 mid-term cycles.The sedimentary system and sand body distribution are studied.There are two provenance systems developed in the northeast and southwest of the study area.The meandering river delta in the northeast deposited in Fuxian-Xunyi-Yijun area,and developed two to three distributary channels.The braided delta in the southwest mainly deposited in Longdong and Zhenjing area,and developed four to five branch channel sand bodies with favorable inherit.The sand bodies in the southwest mainly developed in Chang 8 reservoir,while the sand bodies in the northeast mainly developed in Chang 6 and Chang 2+3 reservoirs.The subaqueous distributary chan nel san d bodies and low—amplitude structures in the southeast are the favorable zones for oil and gas accumulation.

Key words: gas reservoir, trap, structure, anticline, syncline, deep gas reservoir, gas-water inversion, capillary, capillarypressure

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