鄂尔多斯盆地甘泉地区下侏罗统高分辨率层序地层学分析

High-resolution sequence stratigraphy of Lower Jurassic in Ganquan area,Ordos Basin

根据层序沉积时限以及基准面旋回界面识别标志,运用高分辨率层序地层学理论和方法,对鄂尔多斯盆地中南部甘泉地区下侏罗统进行了划分。识别出下侏罗统各级旋回层序界面,并将其划分为1个超长期、8个长期、32个中期、86个短期旋回层序。应用地层等时对比技术,以长期旋回层序为地层对比框架、中期旋回层序为地层对比单元,建立了研究区下侏罗统等时地层格架。下侏罗统沉积于盆地基底快速沉降、缓慢抬升的构造环境,在基底抬升速度周期性变化过程中,盆地边缘沉积了数层可采煤层,成为划分层序的重要依据。

The classification of high resolution sequence stratigraphy of Lower Jurassic in Ganquan area of Ordos Basin is discussed based on sequence deposition time and identification markers.According to interface types the Lower Jurassic sequences can be divided into 1 super-long-time base-level cycle sequence and 8 long time,32 middle long time,86 short time base-level cycle sequences.By using the technology of isochronous stratigraphic correlation of high resolution sequence stratigraphy the sequence framework i...