基于高精度岩心扫描元素数据的高频层序划分:以西科1井第四系生物礁滩体系为例

发布时间：2018-06-26 19:22

本文选题：生物礁 + 元素　；参考：《地质科技情报》2016年05期

【摘要】：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咊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。
[Abstract]:The reef growth requires strict environmental parameters of water body, so the vertical evolution of reef system contains abundant information of paleo-sea level and paleoenvironmental change. In the sequence framework based on sea level change, the geochemical index of elements in the reef presents a good regularity. The mineral composition and element geochemistry of Quaternary reef beach in well Xicao 1 were analyzed by Panalytical diffractometer and Itrax core scanner respectively. High magnesium calcite mainly distributes in Quaternary shallow layer, and deep layer is low magnesium calcite. According to the mineral composition, the Quaternary system is divided into two sections: the rich stone section and the rich calcite section. The spectral analysis and wavelet transform of different element indexes are used to effectively carry out the five-order sequence and the six-order sequence division, respectively. The Fuwenshi formation can be further divided into 6 five-order sequences and 24 six-order sequences, while the Fu-calcite formation can be divided into 21 five-order sequences and 74 six-grade sequences. The results show that the element indexes in the high-frequency units also show regular changes. It reflects periodic environmental changes.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;中海石油(中国)有限公司湛江分公司研究院;中国地质大学丝绸之路地质资源国际研究中心;中海油研究总院;
【基金】：国家自然科学基金项目(91028009;41372112);国家自然科学基金青年科学基金项目(41202086) 国家重大油气专项(2011ZX05025-002-02)
【分类号】：P736.2

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