鄂尔多斯盆地地表元素地球化学场与能源矿产关系初探

Preliminary study of relation between geochemical field of surface elements and energy minerals in Ordos basin

潘爱芳 赫英 马润勇

Pan Aifang He Ying Ma Runyong

烃类蚀变和吸附作用通过增大流体的溶解能力、改变介质的氧化-还原条件和酸碱度、影响土壤颗粒的润湿性等方式,对元素地球化学场产生影响。鄂尔多斯盆地元素地球化学场与能源矿产关系密切,铁族元素和亲铜元素的低背景叠合分布区为煤和天然气藏的主要赋存区;钨钼族元素的低背景与铁族元素、亲铜元素的低背景之间的过渡带为铀矿床的有利富集地带;钨钼族元素低背景区为油气藏和煤矿远景富集区;规模大、级别高的元素高、低背景区对应富矿大矿。鄂尔多斯盆地及其周缘区地表元素地球化学场可分为4个分区,Ⅰ区富集石油、天然气、煤;Ⅱ区是天然气、煤和铀矿富集区;Ⅲ区是石油与煤的共生区;Ⅳ区是多金属、贵金属以及铀矿的有利富集区。

Hydrocarbon alteration and adsorption can influence geochemical field of elements through enhancing dissolubility of fluids, changing redox conditions and pH values of media and impacting wettability of soil particles. The geochemical field of elements is closely related with the energy minerals in Ordos basin. The superposition zones of low background of iron group and chalcophile elements are the major lodging points of coal and natural gas. The transitional zones between low backgrounds of W Mo group elements and iron group and chalcophile elements are the favorable enriched zones of uranium deposits. The low background areas of W Mo group elements are the prospective enriched zones of hydrocarbons and coals. Large scale and high ranked low or high backgrounds of elements are generally correlated with large and rich deposits. The geochemical field of surface elements in Ordos basin and the surrounding areas can be divided into 4 zones, of which zoneⅠis enriched with oil, natural gas and coal, zoneⅡis the enriched zone of natural gas, coal and uranium, zone Ⅲ is the coexisting zone of oil and coal, and zone Ⅳ is the enriched zone of polymetralic and noble metallic ore and uranium deposits.

10.11743/ogg20040606