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The Application of Quantitative Grain Fluorescence Technique to Restore the Hydrocarbon Charge History of Carboniferous Reservoirs in Tazhong Area, Tarim Basin
详细信息   
摘要
The Tazhong area experienced complexed structural evolution,which makes studies on hydrocarbon accumulation in this area more challengeable.In order to restore the hydrocarbon charge history of this area,we carried out a study the quantitative grain fluorescence(QGF and QGF-E) techniques was carried out.The results show that a palaeo-oil zone and a residual oil zone exist below the present oil-water contact in Well TZ421,the former having a strong QGF response is distributed between-2 510m and-2 610m with a paleo-oil-water contact at-2 610m,while the latter with a strong QGF-E response is located between-2 510m and-2 570m with a residual oil-water contact at-2 570m.In addition,above the current gas-water contact of Well TZ103,a palaeo-oil zone can be observed between-2 555m and-2 605m with a paleo-oil-water contact at-2 605m.The geological conditions for hydrocarbon accumulation indicate that the paleo-oil zone with a thickness about 100m in well TZ421,due to a large-scale charging of light-oils.Charge in late Hercynian,and two episodes of oil leakage later in Yanshanian,and the formation of condensate gas cap during the Himalayan gas a 50m-thick paleo-oil zone within the present condensate gas reservoir in well TZ103,suggesting a light-oil charge in late Hercynian before the formation of the condensate gas reservoir,which is formed by the Himalayan gas charge and does not destroy the previous paleo-oil zone substantially.The reservoir of Well TZ421 is believed to have been charged initially down to 2 610m,the depth of the paleo-oil-water contact.The presence of a 60m-thick residual oil zone below the current oil-water contact,as delineated by the QGF-E response,suggested that the paleo-oil zone leaked in two episodes and part of the oil column lost quite recently.The strong QGF response of the current gas-condensate zone in the two wells indicated that the initially charged oil is subsequently partly dissolved in gas.Two episodes of the Carboniferous hydrocarbon charging history can be restored by applying quantitative grain fluorescence techniques,and this work provides new evidence for researches on hydrocarbon accumulation history in this area.

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