塔中北斜坡中下奥陶统鹰山组沉积相类型及分布研究

STUDY ON SEDIMENTARY FACIES' TYPES AND DISTRIBUTION OF THE MIDDLE-LOWER ORDOVICIAN IN THE NORTH RAMP OF TAZHONG AREA

塔中北斜坡下奥陶统鹰山组具有较好的油气勘探前景,以区域沉积背景研究为基础,通过岩心精细描述、薄片鉴定、测井资料分析,认为该区下奥陶统鹰山组主要发育斜坡相、台地边缘相和开阔台地相。通过对沉积相序、沉积相纵横变化特征、沉积相平面分布特征的研究,揭示出塔中北斜坡下奥陶统鹰山组沉积时期斜坡-台缘的沉积相平面展布特征,其中台地边缘相带是最有利的勘探区带。高能沉积相带的发现对于扩大该区的油气勘探领域具有重要的指导意义。

Tazhong northern ramp has favorable exploration prospect,based on the study of regional sedimentary background,and through accurate core description,thin section identification and logging data analysis,it is found that the Lower Ordovician Yingshan Fm of Tazhong northern ramp developed slope,platform margin and open platform.Through the study on sedimentary facies sequence,vertical and lateral variation characteristics and plane distribution variation characteristics of sedimentary facies,It is pointed out in the paper that sedimentary facies plane distribution feature of slope and platform margin in the sedimentary period of Lower Ordovician Yingshan Fm are found,and platform margin is the most favorable exploration zone.Discovery of high energy facies belts has important guidance for further oil and gas exploration for this area.