近岸浅海环境混积模式研究

Study on mixed model of nearshore shallow sea environment

为搞清研究区混积层沉积体系,应用岩心、录井、测井、反演等资料,基于混积岩性识别及沉积环境分析,确定沉积相类型及其展布规律,并总结归纳沉积模式。结果表明:研究区混积层属浅海环境碳酸盐岩潮坪与碎屑岩潮坪互层的混积潮坪沉积,剖析出碎屑岩潮坪、碳酸盐岩潮坪和岩性混积潮坪,划分出3亚相10余种微相,平面上潮坪具分带性、主要呈片状展布,两种潮坪可毗邻也可靠岩性混积潮坪衔接,纵向上同类潮坪的潮间带、潮上带可连续沉积,不同类潮坪间的潮间带、潮上带可交互沉积,海退期碎屑潮坪较发育,海侵期碳酸盐岩潮坪与岩性混积潮坪较发育。建立具陆源碎屑供应的近岸浅海沉积环境混积模式,为海陆过渡环境混积潮坪沉积研究提供参考。

In order to find out the sedimentary system of the mixed beds in the study area,on the basis of comprehensive application of core,well logging,well logging,inversion and other data,based on the identification of the mixed lithology and analysis of the sedimentary environment,the type and distribution law of sedimentary facies are determined,and the deposition model is summarized.The results show that mixed beds in the work area belong to the interbedded tidal flat of carbonate rock and clastic rock in shallow sea environment.It's classified as a clastic tidal flat,carbonate tidal flat and lithologic mixed tidal flat,including 3 subfacies and 10 kinds of microfacies.In the plane,the tidal flat is zoned and mainly distributed in sheets,the two tidal flat can be adjacent to and connected by reliable lithologic mixed tidal flat.Longitudinally,the intertidal zone and supratidal zone of the same tidal flat can be continuously deposited,and the intertidal zone and supratidal zone of different tidal flat can be interdeposited.The clastic tidal flat is more developed in the regressive stage,and the carbonate tidal flat and lithologic mixed tidal flat are more developed in the transgressive stage.This paper establishes the sedimentary model of intercontinental mixed tidal flat,which provides reference for the study of mixed tidal flat in the transitional environment of sea and land.