The Inorganic Geochemical Response to Oil/Water Intervals in Junggar Basin and Its Application
详细信息
- 责任者：Cao Jian (Department of Earth Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Wang Xulong
- 刊名：Acta Petrolei Sinica
- 出版年：2012
- 卷期：33(3)
- 关键词：油水界面 ; oil-water interface ; 油气藏形成 ; reservoir formation ; 准噶尔盆地 ; Junggar Basin
- 页码：p.361-366
- 图表：2 illus., 18 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
Generally,the identification of oil,gas and water intervals is made mainly through interpreting logging data and sometimes in combination with organic geochemical methods.This,however,often meets large uncertainties when complex petroleum migration and accumulation occur.Consequently,economic loss and exploration risk arise.In order to make an approach to solving this issue in other ways,we made an inorganic geochemical investigation based on the interaction mechanism among reservoir hydrocarbons,water and rocks.The case study in the Luxi area of the central Junggar Basin implied two relatively effective parameters for the identification of oil,gas and water intervals,i.e.,diagenetic features of the interaction and the in-situ geochemical composition of representative diagenetic minerals.While the whole-rock geochemical composition of minerals,by contrast,is only a reflection of the average and mixing information on the complex interaction,and thus cannot be used to distinguish different intervals effectively.In the study area,the abundance of hydrocarbons decreases gradually in order of oil,oil-water,water and dry intervals and so does the dissolution related to hydrocarbon charge.Typically,alkaline minerals including calcite and feldspar are dissolved by the action of acidic hydrocarbon-bearing fluid.In addition,the assemblage of diagenetic minerals also varies with different intervals.Kaolinite,kaolinite-pyrite-hematite,siderite-chlorite and chlorite are indicative of the four different intervals,respectively.The abundance of element Mn(an average MnO content) in diagenetic calcites is commonly >2.5 %,2.0%~2.5 %,1.5%~2.0 % and <1.0 % for the four intervals,respectively.These parameters could be applied to the regional petroleum exploration,and this approach has also general implications for studies to distinguish oil/gas/water intervals elsewhere.
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