济阳坳陷上第三系馆陶组上段沉积相研究

SEDIMENTARY FACIES OF THE UPPER MEMBER OF THE NEOGENE GUANTAO FORMATION IN THE JIYANG DEPRESSION

利用地质资料、测井资料、地震资料及分析化验资料对济阳坳陷上第三系馆陶组上段岩相古地理特征进行了全面系统地研究。首先从岩性、沉积结构和构造、砂体形态、电性特征、地震反射等方面论证馆陶组上段为山麓洪积相和河流相沉积,其中它们又可进一步细分为10种亚相或微相。其次,详细论述了沉积相的平面展布,同时还指出了油气分布与沉积相带的关系。此外,本文还指出馆陶组上段沉积期的物源方向、河流流向、最终汇水区及当时的古气候条件等。

A complete and systematic study has been made on the lithofacies — paleogeography of the upper member of the Neogene Guantao Formation in the Jiyang depression by using geologic, well logging, seismic and chemical data. First, from the lithologic characters,sedimentary textures and structures, sand body shapes, electrical properties and seismic reflection,the authors have proved that the upper member of the Neogene Guantao Formation is represented by piedmont profluvial and fluvial facies deposits, which are further divided into ten subfacies or microfacies. Second, the authors discuss in detail the distribution of these subfacies and the relationships between sedimentary facies belts and oil and gas distribution. In addition, the paper also deals with the direction of provenance, direction of channel water, ultimate catchment areas and paleoclimate during the deposition of the upper member of the Guantao Formation.