柴达木盆地油砂山油田下油砂山组高分辨率层序地层分析

High resolution sequence stratigraphy analysis of lower Youshashan Formation in Youshashan oil field in Qaidam Basin

以高分辨率层序地层学理论为指导,通过岩芯、钻井、测井资料的综合研究,进行了柴达木盆地油砂山油田下油砂山组地层划分与对比。以测井曲线上识别出的区域稳定的标准层建立单井层序框架,在单井层序划分的基础上,在研究区选择大致平行和垂直物源2个方向,进行密集井网的连井剖面对比,建立了研究区高分辨率层序地层格架。以短期和超短期旋回层序为等时地层格架内的对比单元,在地层格架内研究砂体的展布、沉积相的发育演化过程,预测储层,指导油田后期的开发。

Based on high resolution sequence stratigraphy theory,and through the comprehensive study of outcrops,cores,drilling and logging data,the authors studied in details the strata division and contrast for lower Youshashan Formation in Youshashan oil field in Qaidam Basin. Single well sequence stratigraphic framework was established in accordance with the regional stable beds identified by logging curves,and based on the single well sequence stratigraphic framework,two directions were chosen approximately parallel and perpendicular to the provenance in the study area,so as to make connecting-well contrast of dense well network and establish high resolution sequence stratigraphic framework in the study area. Taking short-term and ultra short term cyclic sequences as contrasting units in the isochronous stratigraphic framework,the authors studied the distribution of sand bodies,the development and evolution of sedimentary facies in the stratigraphic framework,thereby that will be beneficial to the reservoir prediction and the late exploration of the oilfield.