鄂尔多斯盆地北部地质构造格局及前中生界的油气远景

鄂尔多斯盆地是一个在古生界槽台对立基础上发展起来的以中生界为主体的大型沉积盆地。在盆地北部进行前中生界的油气研究工作,应该分析这个地区一度作为大陆边缘的古生代活动背景,恢复到当时的沉积古地理环境,对它的沉积构造格局进行划分。在认识这个地区古生界发展历史,以及在处理活动带与稳定区之间的结合关系上,经常遇到两种不同的意见。

THE TECTONIC FRAMEWORK AND PETROLEUM PROSPECTIVITY OF PRE-MESOZOIC IN THE NORTHERN PART OF THE EERDUOS(ORDOS) BASIN

When conducting oil and gas exploration in the Pre-Mesozoic in the northern part of the Eerduos Basin, it should be borne in mind that the basin was once a continental margin. Based on the structural setting in the different stages of tectonic movement, the author divides the region into five structural units from west to east as follows: the Helan fold zone, the Tianhuan syclinal zone, the hinge zone, the monoclinal zone and the Wula nger uplift. When exploring for oil and gas in the northern part of the basin, the following points should be given proper attention: 1) from Zhuzishan to Majiatan, keep an eye on the structure there which is a hinge zone from a slope leading to a deep trough, and from Shanyanjing to Bujianghai fault-depression zone, on the hidden unconfo rmity surface at the bottom of the upper and lower Paleozoic and the Shihezi formation; 2) notice the uplift of the lower Paleozoic from Qingyang to Wushenqi and also the middle section of the Helan fold zone; 3) the possibility of Wulanger uplift being a petroliferous buried hill.