鄂尔多斯多旋回叠合盆地形成与演化

MULTICYCLE SUPERIMPOSED BASIN FORM AND EVOLUTION OF ORDOS BASIN

鄂尔多斯盆地奠基于太古代-早元古代的结晶基底之上,其演化过程以稳定发育为特征,但其稳定性和活动性是对立统一、协调发展的。以钻井资料和地震资料为基础,恢复了各时期的古构造形态。结合沉积特征,将盆地演化划分为4个主要阶段,即中晚元古代坳拉谷盆地发育阶段、古生代大型稳定克拉通盆地发育阶段、中生代前陆盆地发育阶段、新生代周缘断陷盆地发育阶段。指出盆地早期演化主要受中央古隆起控制,表现为中部隆,东、西坳的古构造格局;晚期演化主要受后期改造的影响,表现出西部持续坳陷、东部整体掀斜的古构造格局;二叠纪石千峰期为这2种构造格局转换的关键时期。

Ordos basin is a large multicycle superimposed basin, developed on the basement of crystalline basement from Archean to early Proterozoic. The course of evolution develop steadily, at the same time develop with activity. In the paper, according to drilling and seism datum, recover ancient tectonic configuration, combine with sedimentary characteristic, plot out evolution phases of basin. Its development suffered four periods, aulacogen basin developed on middle-late Proterozoic, Karton basin developed on Paleozoic, foreland basin developed on Mesozoic, fault basin developed on Cenozoic. Early evolution of basin are controlled by palaeohigh of center, hunch of center and depress of east-west; late evolution of basin are influenced by late alteration, durative depress in the west and monolithic raise in the east. The key term of structure evolution are Shiqianfeng term of Permian.