Characteristics of Hydrocarbon Inclusions and Geological Age of Hydrocarbon Accumulationin Ordovician Reservoir of Eastern Lungu Area,Tarim Basin#br# 

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  • 1.Northwest Research Institute of Petroleum Exploration & Development,PetroChina,Lanzhou 730020,China;
    2.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
    3.Research Institute of Petroleum Exploration & Development,PetroChina Tarim Oilfield Company,Kuerle 841000,China;
    4.China University of Petroleum,Beijing 102249,China

Received date: 2013-11-12

  Revised date: 2013-11-27

  Online published: 2014-10-10

Abstract

The information contained in fluid inclusions can demonstrate the hydrocarbon accumulation period.Based on the fluorescence characters and the occurrence relationships of hydrocarbon inclusions in the Ordovician reservoir of eastern Lungu area,and combined with micro-thermometry analysis of coexisting aqueous inclusions,hydrocarbon inclusions of Ordovician reservoir can be divided into three stages.The brown fluorescence hydrocarbon inclusions representing the first stage were formed in the Late Caledonian-early Hercynian Period.The yellow fluorescence hydrocarbon inclusions of second stage were formed in the Late Hercynian Period.And the blue-white fluorescence hydrocarbon inclusions representing the last stage were formed in the period of Yanshan-Himalayan.Quantitative Grain Fluorescence (QGF) fingerprints were analyzed compared with Total Scanning Fluorescence (TSF) fingerprints of adsorbed hydrocarbons and non-hydrocarbons.The consistency of the inclusion oil and absorbed oil in the Ordovician reservoir is satisfactory.Based on PT simulation results of coexisting aqueous inclusions,combination of trapped-temperature and trapped-depth of fluid inclusion on the diagram of geothermal-burial history can be used to make sure about the history of hydrocarbon accumulation in Ordovician reservoir.Ordovician reservoirs of eastern Lungu area were charged three times.The first stage of heavy oil-filling was in the period of Late Caledonian-Early Hercynian|and the second stage happened in the period of Late Hercynian with normal oil filling|and the third stage of light oil or condensate oil-gas filled in the period of Early Himalayan.The Ordovician oil-gas reservoirs in eastern Lungu area were charged by the first and second stages of oil and gas which had been destroyed and degraded to different degrees before the oil-gas filled in the third stage.
 

Cite this article

FANG Qi-fei,ZHANG Nai,ZHANG Bao-shou,LU Yu-hong,WU Xue-qiong,YU Xiao-qing . Characteristics of Hydrocarbon Inclusions and Geological Age of Hydrocarbon Accumulationin Ordovician Reservoir of Eastern Lungu Area,Tarim Basin#br# [J]. Natural Gas Geoscience, 2014 , 25(10) : 1558 -1567 . DOI: 10.11764/j.issn.1672-1926.2014.10.1558

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