摘要
文章从构造体系出发,系统地研究了盆地周边山区构造,盆地基底构造、中、新生代盖层构造以及它们之间的联系,研究了古盆地、现代盆地的形成,发展和演化过程及其对中、新生代沉积的控制和生、储油条件。提出柴达木盆地中、新生代含油远景区主要分布在阿尔金山南缘盆地的西北部,并将其划分为六个二级含油远景较好的地段。同时提出中侏罗统是柴达木盆地主要油源,在德令哈凹陷和祁漫塔格山前的基底中可寻找古生代油源。
This paper, from the viewpoint of the structural system, systematically elucidates the structures of the mountains at the peripheries of the basin, and the basement structure and the Mesozoic-Cenozoic sedimentary cover structures of the basin as well as the relationships among them. It also discusses the formation, development and evolution of the old and modern basins and their control over the Mesozoic-Cenozoic sediments and the conditions for oil generation and accumulation.The authors hold that the Xiyu system is the basis for the formation of the Qaidam basin. The compound reversed S-shaped compresso-shear basin of Qaidam and the reversed S-shape of the basement were formed by the dextral shearing of the Xiyu system and the sinistral shearing of the Altun fault.The structures of the Mesozoic-Cenozoic sedimentary cover include two types of folds: synsedimentary folds and surface folds. The former have mostly inherited the reversed S-shape of the basement to form a reversed S-shaped sedimentary cover.The reversed S-shaped anticlines occur successively from head to tail.The Qaidam basin was primerily formed during the Jurassic. The centre of the ola lake basin was situated in the northwestern part of the basin. From the Oligocene to Pliocene, the scope of the lake basin was the largest. In the late Plioce- ne, the basin was folded and uplifted, and its centre shifted to the southeastern part, forming a Quaternary new depression.The authors hold that the Palaeozoic strata on the basement of the Delingha depression have potentials for oil prospecting. The Mesozoic-Cenozoic potential oil areas are distributed in the northwestern part of the basin. It is believed that the middle Jurassic is possibly a main oil source in the Qaidam basin.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第4期314-323,共10页
Geological Review
