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库车前陆盆地寒武系 -第三系流体分析显示 :寒武系 -奥陶系和侏罗系油田水与白垩系 -第三系有所差异 ,前者总矿化度相对较低 ,为 90g/L～ 1 1 0g/L ;相对富Ca2 + 和HCO-3 ;后者总矿化度介于 73g/L～ 3 1 0g/L,主要为 1 3 0g/L～ 2 90g/L,相对富K+ +Na+ 和Cl-;而大宛齐第三系油田水则相对富Ca。影响水化学演化的因素包括 :膏盐类、沸石类矿物溶解以及白云化作用和富镁绿泥石形成等。白垩系油田水δ18O、δD关系显示为淡水蒸发成因 ,且在轮台断隆带油田水87Sr/86Sr向西降低 ,指示了富87Sr的流体来自东部的碎屑泥岩 ,这与本区煤成油运移方向是一致的。而 2个寒武系 -奥陶系油田水87Sr/86Sr高达0 .71 71 6,并富Li、B、Sr元素和δ18O ,被认为来自结晶基岩 ,与氮气、氦气及部分甲烷的来源一致。
The Cambrian-Tertiary fluid analysis in the Kuqa foreland basin shows that there is a difference between the Cambrian-Ordovician and Jurassic oilfields and the Cretaceous-Tertiary. The former has a relatively lower total salinity and is 90g / L ~ 110g / L; relatively rich in Ca2 + and HCO-3; the total salinity of the latter ranged from 73g / L to 310g / L, mainly from 130g / L to 290g / Relatively rich in K + + Na + and Cl-; while Dawan Qi Tertiary oilfield water is relatively rich in Ca. Factors that affect the evolution of hydration include: gypsum salts, dissolution of zeolite minerals, formation of dolomitization and formation of magnesia chlorites. The relationship between δ18O and δD in Cretaceous oilfields is shown as the origin of freshwater evaporation and decreases westward of 87Sr / 86Sr in Luntai uplift belt, indicating that the 87Sr-rich fluid is from the eastern part of the crust and mudstone, The direction of migration is the same. 87Cr / 86Sr in the two Cambrian-Ordovician oil fields are as high as 0.71 71 6 and are rich in Li, B, Sr and δ18O, which are believed to be derived from crystalline base rocks, with sources of nitrogen, helium and partial methane Consistent.