Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (2): 174-178.doi: 10.11743/ogg20130205

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Geological characteristics of the Triassic tight sandstone oil and gas reservoirs in Luoyang-Yichuan area

Du Jianbo1,2, Tian Jingchun1,3, Hu Junqing2, Cao Jiankang2   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Exploration & Production Research Institute of Henan Oilfield Company, SINOPEC, Nanyang, Henan 473132, China;
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2012-03-13 Revised:2012-11-20 Online:2013-04-28 Published:2013-05-02

Abstract:

Research of the petroleum geological conditions indicates that Luoyang-Yichuan area is located in the same large depressed lacustrine basin with Ordos Basin in the Triassic.They have similar source-reservoir-caprock associations,thick and extensive source rocks,tight reservoir and active hydrocarbon shows in the Triassic.Therefore,the Luo-yang-Yichuan area has the geological conditions for accumulation of tight sand oil/gas.In combination with the analysis of industrial gas flow from the Upper Triassic Chunshuyao Formation in Well Tun 1,we believe that the Triassic reservoirs of the Luoyang-Yichuan area are pre-existing tight sandstone oil/gas reservoirs with low permeability,abnormal pressure,inverted oil-gas contact with oil in the upper and gas in the lower.The Triassic tight sandstone reservoirs are the main targets of petroleum exploration in Luoyang-Yichuan area in the future.

Key words: Well Tun 1, tight sandstone, oil and gas reservoir, Triassic, Luoyang-Yichuan area

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