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生物礁生长对水体环境参数要求苛刻,因而生物礁体系垂向演化藴藏了丰富的古海平面、古环境变化信息。基于海平面变化的层序格架内,生物礁体中元素地球化学指标呈现出较好的规律性分布。利用Panalytical衍射仪和Itrax岩心扫描仪分别对西科1井第四系生物礁滩体进行了矿物组分和元素地球化学分析,其中矿物组分结果显示不稳定的文石、高镁方解石主要分布在第四系浅层,而深层以低镁方解石为主。根据矿物组分,将第四系划分为2段:富文石段和富方解石段,分别选用不同元素指标采用频谱分析和小波变换,有效地进行了五级层序、六级层序划分,其中富文石段可进一步划分出6个五级层序和24个六级层序,富方解石段划分出21个五级层序和74个六级层序,划分结果显示,高频单元内元素指标亦呈现出规律性变化,反映了周期性的环境变化。
Reef growth is critical to the environmental parameters of the water body. Therefore, the vertical evolution of the reef system contains rich information of ancient sea level and paleoenvironmental changes. Based on the sea level change in the sequence framework, the element reef geochemical indicators showed a good distribution of regularity. The Panalytical diffractometer and Itrax core scanner were used to analyze the mineral composition and elemental geochemistry of the Quaternary reef beach in Well Xike-1, respectively. The results of mineralogical composition showed that the unstable aragonite and high-magnesium calcite are mainly distributed In the Quaternary shallow, and deep to low-magnesium calcite-based. According to the mineral composition, Quaternary is divided into two sections: Fuwanshi section and Caofelloite section, which are respectively selected with different element indexes by spectrum analysis and wavelet transform, and are effectively divided into five levels and six levels, in which There are six fifth-level sequences and twenty-four sixth-level sequences in the Fu-wen-shi section, and 21 fifth-level sequences and 74 sixth-level sequences are defined in the rich calcite segment. The division results show that the element indices Also showed a regular change, reflecting the cyclical changes in the environment.