【摘要】 对于渤海湾盆地下第三系中碳酸盐岩的形成环境,目前仍有争论。本文运用碳、氧同位素、阴极发光、古生物、薄片等资料对盆地内歧口凹陷沙一下碳酸盐岩的形成环境进行了分析,认为沙一下碳酸盐岩沉积时水体盐度和镁离子含量断续增大,这可能与海水的漫入有关。碳酸盐岩主要分布于古湖湾区,碳酸盐颗粒的形成受向阳性、凹陷形态、水体深度、清洁度等因素的控制。生物碎屑主要分布于王徐庄油区和孔店隆起东南坡,鲕粒主要分布于周清庄油区和孔店隆起西北坡。并且,以生物碎屑为核的鲕多为真鲕,以砂屑为核的鲕多为表鲕;自下而上随沉积时水体加深、能量减弱,鲕粒由以真鲕为主变为以表鲕为主。更多还原

【Abstract】 The environment of formation of the carbonate rocks in Lower Tertiary in the Bohai bay remanis be a problem. The depositional environment is analyzed in this paper according to the data from carbon and oxygen isotope, luminescence microscope, palaeobiology, thin section studies ets. It is suggested that the carbonate rocks was formed in the water body with various salinity and Mg²⁺ at different geological time, this is probably related to the transgression. The carbonate rock occured mainly in ancient bay, and it is controlled by the shape of depression, temperature, depth and clearness. The biocarbonates are distributed dominately in Wangxuzhuang oil field and the southeast flank of Kongdian uplift, while the oolites are mainly located in Zhouqingzhuang oil field and the northwest flank of Kongdian uplift. There are different types of oolites formed with various core material and is affected by energy of water body also.更多还原