东北大三江盆地群早白垩世存在统一湖盆的沉积学证据

发布时间：2018-06-04 02:02

本文选题：大三江盆地群 + 中国东北　；参考：《中国地质》2016年04期

【摘要】：大三江盆地群位于黑龙江省东部,中生代以来经历了多期构造运动,形成现今各自分割的10余个残余盆地。由于缺乏关键性证据,前人对大三江地区早白垩世是否存在统一湖盆存在争议。本次研究通过野外地质调查和钻井岩心观察,认为盆地总体缺乏边缘相沉积,并且主要以三角洲平原亚相和滨浅湖亚相为主。古水流恢复和重矿物特征显示,研究区主要存在西部和西北部、东部以及东南部三大物源体系,并且平面上具有由四周向中心汇聚的特征。地震资料反射特征显示下白垩统具有典型的断陷-坳陷复合结构,坳陷时期地层由各盆地中心至边部未出现明显的地层减薄现象,现今的盆地边界断裂多为后期对盆地进行改造、破坏的逆冲断裂。这些证据都是对大三江地区早白垩世存在统一湖盆的有力支撑。本研究不仅能为大三江盆地群原型盆地的恢复提供重要依据,也将为东北盆地群油气资源远景评价和进一步的勘探部署提供参考。
[Abstract]:The Dasanjiang basin group is located in the eastern part of Heilongjiang Province. It has undergone many tectonic movements since the Mesozoic and has formed more than 10 residual basins which are now divided separately. Due to the lack of key evidence, there is a dispute about the existence of a unified lake basin in the early Cretaceous in Dasanjiang area. Based on the field geological survey and drilling core observation, it is concluded that the basin lacks marginal facies in general and mainly consists of delta plain subfacies and littoral shallow lacustrine subfacies. The paleocurrent recovery and heavy mineral characteristics show that there are three major provenance systems in the western, northwest, eastern and southeastern parts of the study area, and they converge from four sides to the center on the plane. The reflection characteristics of seismic data show that the Lower Cretaceous has a typical fault-depression composite structure, and there is no obvious stratigraphic thinning from the center to the edge of each basin during the depression period. Most of the current basin boundary faults are retrofitted and destroyed by thrusting faults. All these evidences support the existence of a unified lake basin in the early Cretaceous in Dasanjiang area. This study can not only provide an important basis for the restoration of the prototype basins of the Dasanjiang Basin group, but also provide a reference for the prospective evaluation of oil and gas resources and the further exploration arrangements of the Northeast Basin Group.
【作者单位】：中国地质调查局西安地质调查中心;中国地质大学(武汉)资源学院;中国石油勘探开发研究院;西南科技大学环境与资源学院;
【基金】：国家科技重大专项(2016ZX05025001-006) 国家自然科学基金项目(41302047,41502200)联合资助~~
【分类号】：P618.13;P534.53

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