泌阳断陷双河—赵凹地区下第三系核三组上段沉积微相研究

SEDIMENTARY MICROFACIES IN THE UPPER MEMBER OF THE EOGENE HESAN FORMATION IN THE SHUANGHE-ZHAO’AO AREA,BIYANG FAULT DEPRESSION,HENAN

关键词:  陆相层序  沉积微相  泌阳断陷  下第三系

Key words:  continental sequence  sedimentary microfacies  Biyang fault depression  Eogene

摘要:

泌阳断陷双河—赵凹地区下第三系核三组上段可划出三个陆相层序,其沉积相由南而北表现为冲积扇—扇三角洲一湖相配置型式。在明确研究区物源方向、物源区及其大地构造性质的基础上,综合利用研究区目的层段的钻井、测井及地质资料,根据其地震相平面展布特征,将地震相转换为沉积相,并由此归纳出研究区核三组上段的沉积模式。在研究区所划的三个陆相层序中,共发育四类13个小层序组,其中可识别的小层序达50多个。在这些众多的小层序中,可识别的沉积微相达十余种、岩性相共33种。

Abstract:

Three continental sequences may be recognized for the upper member of the Eogene Hesan Formaion in the Shuanghe-Zhao'ao area of the Biyang fault depresion,where the sedimentary facies display a facies pattern of alluvial fan-fan delta-lake from south to north.A sedimentary model is thus suggested for the upper member of the Hesan Forma-tion on the basis of source area and its tectonic settings,in combination with well logs and geological data as well as the distribution of the seismic facies.The studied three continen-tal-sequences comprise thirteen parasequence sets including more than fifty parasequences, of which more than ten are sedimentary mocrofacies;thirty-three are lithologic facies.