鄂尔多斯盆地基底断裂地球化学特征研究

目的 为了研究鄂尔多斯盆地基底断裂地球化学特征及其与能源矿产的关系。方法对盆地内基底断裂特征及其活动性、盆地元素地球化学场以及与能源矿产关系作对比和分析。结果鄂尔多斯盆内基底断裂控制了多种能源矿产的分布特征，盆地北部以天然气、大中型煤田为主，南部以油田、中小型煤矿为主，断裂带发育地段以油．气混合区为主，铀矿富集受基底断裂或深断裂的控制；元素地球化学场与基底断裂关系密切，不同高、低背景的元素地球化学场展布位置、走向或扭曲变形与相应地段基底断裂的存在有关，基底断裂控制了地球化学场和元素组合特征。结论基底断裂控制了地球化学场的分布特征，基底断裂的存在与活动、地球化学场特征等都反映盆地内存在深部流体活动，基底断裂的活动为深部流体的运移并参与多种能源矿产的成藏成矿作用提供了有利条件。

A study on geochemistry feature of basement fractures in Ordos Basin

Aim To study the geochemistry feature of basement fractures and the relationship between them with energy minerals. Methods Comparing and analyzing the feature and activity of basement fractures, element geochemistry fields with the relation between them and energy minerals in Ordos Basin. Results The basement fractures controlled the distribution feature of multi-energy minerals, and most of the natural gas and large to mediumscale coalfields are in northern Ordos Basin. Most of the oil fields and medium to small-scale coalfields are in south Ordos Basin, the distribution regions of fault zones are mostly a mix regions of natural gas and oil fields, enrichment of uranium deposits is controlled by basement fractures or deep fractures. Element geochemistry fields are closely correlative with basement fractures, and the distribution location, strikes and tortuosity of all kinds of element geochemistry fields are related with the basement fractures in the corresponding section. The geochemistry fields and its element compounding are controlled by the basement fractures. Conclusion The distribution feature of geochemistry fields is controlled by the basement fractures. Existence of the basement fractures and their activity and the feature of geochemistry fields reflect active indication of deep fluids. Activity of the basement fractures offer migration of deep fluids and join formation of multi-energy minerals for a advantaged condition.