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柴达木盆地西部一些背斜构造单元古近系-新近系地层赋存有储量巨大的油田卤水资源,有望成为第四纪盐湖卤水的后续利用资源。通过野外实地考察取样,参考已有数据资料,选取资源丰富、区域代表性强的柴达木盆地西部的小梁山、南翼山、油泉子、开特米里克、油墩子和油砂山等典型构造区石油钻孔的油田卤水为主要研究对象,地表盐湖、晶间卤水为参比,分析其硼同位素数据。在此基础上初步探讨了油田卤水的成因、演化和物源信息。研究结果表明,油田卤水应以陆相来源为主,其形成与化学演化、资源元素的高产富集主要是地表水(大气降水)深大断裂循环,通过淋滤溶解地表以及地下各种岩石、矿物,发生水-岩相互作用、变质作用、湖盆蒸发作用等一系列演化过程,同时更重要的是还有来自深部的地质流体混合,带来了丰富的资源元素如Br、B、Li等而形成油田卤水。根据油田卤水的成因类型推断,柴达木盆地西部油田卤水有很好的远景储量,补给源充足。
Some anticline anticlinal tectonic units in the western Qaidam basin have paleogene-Neogene strata that contain abundant reserves of oilfield brines and are expected to become the follow-up resources for the Quaternary salt lakes. Through the field investigation and sampling, with reference to the available data and data, we select the typical Xiaoluanshan, Nanyishan, Yumizi, Kettering, Yudanshan and Yansha Mountains in the western Qaidam Basin, which are rich in resources and strong in regional representation Oilfield brines in the oil-structural drilling area of the tectonic area are the main research objects. The surface salt lake and intergranular brine are used as reference to analyze the boron isotopic data. On this basis, the origin, evolution and source information of oilfield brine are preliminary discussed. The results show that oilfield brine should be dominated by terrestrial sources and its formation and chemical evolution. The high yield and enrichment of resource elements is mainly the deep fracture cycle of surface water (atmospheric precipitation). By leaching and dissolving the surface and underground rocks, Minerals, water-rock interaction, metamorphism and lake basin evaporation. At the same time, more importantly, there is also the mixing of geological fluids from the deep, which brings about abundant resource elements such as Br, B, Li, etc. The formation of oil brine. According to the genetic type of oilfield brine, it is concluded that the brine in western oil field of Qaidam Basin has a very good long-term reserve, sufficient supply source.