马雪莹,卢远征,樊茹,邓胜徽

• 1:中国石油勘探开发研究院
• 2:提高采收率国家重点实验室
• 3:中国石油天然气集团公司油气储层重点实验室

摘要(Abstract)：

通过对新疆柯坪地区中、上奥陶统萨尔干组和坎岭组高分辨率磁化率数据进行旋回地层学研究,识别出405 kyr长偏心率, 111 kyr短偏心率, 38.6 kyr、34.1 kyr和31.0 kyr斜率,以及21.8 kyr、20.2 kyr、18.5 kyr和18.2 kyr岁差旋回,其中斜率信号突出。滤波结果显示萨尔干组和坎岭组记录了13个405 kyr长偏心率沉积旋回。通过天文校准得出萨尔干组的沉积时限是～2.63Myr,沉积速率为4.94m/Myr;坎岭组的沉积时限是～2.64Myr,沉积速率为5.30 m/Myr。萨尔干组滞流盆地相页岩比坎岭组陆棚灰岩沉积速率低。研究层段的0.16—0.17 m沉积旋回信号明显,表明地轴斜率是研究区中、晚奥陶世重要的气候驱动因子。旋回地层学研究结果还赋予生物化石带地质时代意义,大湾沟剖面所产牙形石带Eoplacognathussuecicus、Pygodusserra、Pygodusanserinus、Baltoniodus variabilis和Baltoniodus alobatus的综合延续时限大于5.27 Myr;所产笔石带Pterograptus elegans、Glossograptus hincksii、Nemagraptus gracilis和Corynoides americanus的综合延续时限为～5.27 Myr。

关键词(KeyWords)： 旋回地层;中、上奥陶统;牙形石带;笔石带;塔里木盆地;新疆

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司“十三五”重点项目(2016A-0206);; 国家科技重大专项(2017ZX05001);; 国家自然科学基金(41702031)共同资助

作者(Author): 马雪莹,卢远征,樊茹,邓胜徽

DOI: 10.19839/j.cnki.dcxzz.2021.0004

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