鄂尔多斯盆地多种能源共存富集的组合形式及上古生界沉积控制机制分析

鄂尔多斯盆地煤、石油、天然气和铀的成藏相互关联,共存富集组合类型多样,在纵向呈规律叠置.晚古生代是鄂尔多斯盆地重要的成矿时期,虽然在盆地属性上与整个中国北方成为一体,沉积上基本一致,但也具有其特殊性.根据对鄂尔多斯盆地上古生界含煤地层沉积特征和层序界面的分析,可以将本溪组至石盒子组划分出9个三级层序,4个二级层序.总体上看,多种能源矿产存在油中气、煤中气、上气下油、油中铀、煤中铀、煤中油,以及单种矿产独立富集等7种共存富集形式.在盆地发展演化过程中,在不同的构造单元叠置了不同的能源组合类型,并且表现出某些相关性.

Combination Types of Coexistent Multiple Energy Resources in the Ordos Basin and an Analysis of the Upper Paleozoic Sedimentation Control Mechanism

Coal, oil, uranium and natural gas are genetically related to each other in the Ordos basin, and the combination type of their coexistence is varied, showing regular superposition vertically. Late Palaeozoic is an important minerogenetic period in the Ordos basin. Although the basin is a component part of the North China basin basically characterized by similar sedimentation, the Ordos basin has it unique features. Based on an analysis of the sedimentary characteristics and sequence surfaces of Upper Palaeozoic coal-bearing strata in the basin, the authors divided the strata from Benxi Formation to Shihezi Formation into nine third-order sequences and four second-order sequences. On the whole, there exist altogether seven types of mineral resources, including gas in oil, gas in coal, top gas and bottom oil, uranium in oil, uranium in coal, and oil in coal, with each one being independent. During the evolution and development of the basin, different combinations of energy resources were developed within different structural units, which, however, showed certain degrees of correlation.