發(fā)布時間：2018-04-16 04:37

  本文選題：泥巖蓋層 + 還原性流體��； 參考：《石油與天然氣地質(zhì)》2017年05期

【摘要】：天然氣田(藏)中滲漏的還原性流體將導(dǎo)致泥巖蓋層的成分(尤其是常量和微量元素)變化。這種變化記錄了還原性流體—巖石相互作用事件,并具有指示油氣藏位置的意義。利用天然類比方法,并以松遼盆地南部王府凹陷青山口組泥巖為對象,對天然氣田(藏)中還原性流體引起的泥巖成分變化和流體在蓋層中的運移方式進(jìn)行了研究。結(jié)果表明:研究區(qū)滲漏流體的主要還原性成分為CH_4,其次為H2S;在流體-巖石相互作用過程中,泥巖中紅色的Fe~(3+)被還原為無色的Fe~(2+),從而導(dǎo)致了漂白現(xiàn)象的出現(xiàn)。Fe~(2+)以膠體的形式隨流體運移至別處或以鐵結(jié)核的形式重新沉淀;漂白過程中U含量的升高、Ga和Sc含量的降低,與U、Mo、V和Ni含量在縱向上的規(guī)律性變化均和流體的還原性有關(guān);在泥巖蓋層中,還原性流體主要在浮力的驅(qū)動下發(fā)生縱向運移,且地層抬升可導(dǎo)致其水位降低;天然氣田(藏)泥巖蓋層中微量元素的規(guī)律性變化具有指示還原性流體流動路徑和方向的意義。
[Abstract]:The leakage of reductive fluid in natural gas field will lead to the change of the composition of mudstone caprock, especially the constant and trace elements.This change records the reductive fluid-rock interaction events and has the significance of indicating the location of oil and gas reservoirs.Using natural analogy method and taking Qingshankou formation mudstone in Wangfu sag of southern Songliao Basin as an object, the changes of mudstone composition caused by reductive fluid in natural gas field (reservoir) and the migration mode of fluid in caprock are studied.The results show that the main reducing component of leakage fluid in the study area is CH4, followed by H _ 2S, and in the process of fluid-rock interaction,The red Fe~(3 in mudstone is reduced to colorless Fe~(2, which leads to the occurrence of bleaching phenomenon. Feb2) moves with the fluid to another place with the form of colloid or reprecipitates in the form of iron nodules.The increase of U content and the decrease of SC content in bleaching process are related to the regular changes of U _ (Mo) V and Ni contents in the longitudinal direction, and the longitudinal migration of reducing fluids in mudstone caprocks is mainly driven by buoyancy.The regular change of trace elements in mudstone caprock of natural gas field (reservoir) has the significance of indicating the path and direction of reducing fluid flow.
【作者單位】： 吉林大學(xué)地球科學(xué)學(xué)院;華北理工大學(xué)礦業(yè)工程學(xué)院;中國石油吉林油田分公司勘探開發(fā)研究院;
【基金】：國家自然科學(xué)基金面上項目(41172091,41572082,41372133) 河北省礦業(yè)開發(fā)與安全技術(shù)重點實驗室開放基金項目(2016kykf02)
【分類號】：P618.13

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