摘要
叠层石礁的形成与演化可以提供重要的地质信息,有助于地质事件分析以及沉积环境演化研究。基于此,对河津西磑口剖面徐庄组进行野外剖面实测和室内薄片鉴定,结合沉积学、岩石学理论对叠层石礁礁体特征、叠层石宏观形态和微观特征进行研究,反演其沉积演化过程,分析其石油地质意义。结果表明:依据叠层石的形态规模分布,研究区叠层石形态自下而上具有分叉→不分叉的变化,反复3次,储层发育厚度具有薄→厚→薄的发育趋势,在叠层石礁发育期间,整体沉积处于海平面上升阶段,中间经历了2次小规模的海平面升降,水动力条件发生了多次变化。鄂尔多斯盆地河津西磑口剖面徐庄组叠层石礁的发现为寒武系叠层石的研究提供了典型实例,研究成果对研究区的沉积演化分析和油气勘探具有重要意义。
The formation and evolution of stromatolite reefs can provide important geological information and con‐tribute to analysis of geological events and study of sedimentary environment evolution.Based on this,field section measurement and laboratory thin section identification are carried out for Xuzhuang Formation of Hejin-Xiweikou section.Combined with sedimentology and petrology theories,characteristics of stromatolite reefs,macroscopic morphology and microscopic characteristics of stromatolites are studied to invert its sedimentary evolution process and analyze its petroleum geological significance.The results show that,according to distribution of morphology and scale of stromatolites,the morphology of stromatolites in studied area has bifurcate-non bifurcate variation from bot‐tom to top,repeating 3 times.Reservoir development thickness shows a trend of thin-thick-thin.During stromatolite reefs development period,deposition was generally in the stage of sea level rise,experiencing 2 small-scale sea lev‐el fluctuations and hydrodynamic conditions changing several times.Discovery of stromatolite reefs in Xuzhuang Formation of Hejin-Xiweikou section in Ordos Basin provides a typical example for study of Cambrian stromatolites.The research has much significance to sedimentary evolution analysis and oil and gas exploration in studied area.
作者
吕奇奇
张蕾
王林
孙学虎
张建坤
LU Qiqi;ZHANG Lei;WANG Lin;SUN Xuehu;ZHANG Jiankun(School of Geosciences,Yangtze University,Wuhan 430100,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China;Jiangxi Institute of Nuclear Geoscience Data Science and Systems Engineering Technology,East China University of Technology,Nanchang 330013,China)
出处
《大庆石油地质与开发》
北大核心
2025年第1期35-45,共11页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气股份有限公司科学研究与技术开发项目“海相碳酸盐岩成藏理论与勘探技术研究”(2021DJ05)
国家科技重大专项子课题“华北中新元古界沉积特征及生储盖组合研究”(2016ZX05004001-004)
江西省核地学数据科学与系统工程技术研究中心开放基金项目“基于深度学习的致密砂岩优势储层识别方法研究”(JETRCNGDSS202103)。
关键词
叠层石礁
沉积特征
环境演化
徐庄组
鄂尔多斯盆地
stromatolite reef
sedimentary characteristics
environmental evolution
Xuzhuang Formation
Ordos Basin
