南堡凹陷高柳构造带新近系馆陶组沉积相研究

Sedimentary facies in the Neogene Guantao Formation in the Gaoliu structural zone,Nanpu depression

关键词:  高柳构造带|馆陶组|沉积相|南堡凹陷

Key words:  Gaoliu structural zone|Guantao Formation|sedimentary facies|Nanpu depression

摘要:

为了指导高柳构造带的滚动勘探开发,笔者对新近系馆陶组的沉积相进行了研究。馆陶组主要发育冲积扇相、辫状河相和曲流河相。冲积扇发育于馆陶组的底部,辫状河发育于该组的中下部,曲流河发育于顶部。对各个时期沉积相的平面演化规律的研究表明,NgⅣ时期主要发育冲积扇扇中和扇缘亚相,NgⅢ和NgⅡ时期主要发育辫状河河道亚相和河道间亚相,NgⅠ时期主要发育曲流河河道和河道间亚相。沉积相发育主要受控于构造运动、较强氧化环境、干旱-燥热的古气候条件和沉积基准面的升降。泛滥平原微相泥岩与河流相砂岩匹配能够形成有利的生储盖组合。

Abstract:

Sedimentary facies in the Neogene Guantao Formation are examined in order to effectively guide the rolling exploration and development in the Gaoliu structural zone,in which the alluvial fan,braided stream and meandering stream facies are developed.The alluvial fan facies appears at the bottom of the Guantao Formation,followed by the braided stream facies developed in the middle and lower parts,and the meandering stream facies is developed on the top of it.There occurred the mid-fan and fan fringe subfacies of the alluvial fan facies during the IV depositional stage of the Guantao Formation;the channel subfacies and interchannel subfacies of braided stream facies during the Ⅲ and II depositional stages of the Guantao Formation,and the channel and interchannel subfacies of the meandering stream during the I depositional stage of the Guantao Formation.The development of the sedimentary facies outlined above is mainly controlled by the tectonic movement,relatively strong oxidation environment,dry and warm climatic conditions and base-level fluctuation during the deposition of the Guantao Formation.The matching of the flood-plain mudstone and fluvial sandstone may form the favourable source-reservoir-seal associations.