海洋地质前沿2025，Vol.41Issue(12)：88-95,8.DOI:10.16028/j.1009-2722.2024.243
化学元素在英国北海深水浊积油田小层精细划分的实践应用
Application of chemical elements for fine stratigraphic division in the deepwater turbidite oil field in the North Sea,UK
摘要
Abstract
Generally,deep-water turbidite sandstone oilfields are characterized by large well spacing,fast lateral reservoir variation,and irregular spatial distribution.Small-scale stratigraphic division and correlation often rely on high-resolution seismic data.When seismic data cannot meet the accuracy requirements,conventional strati-graphic correlation methods often prove ineffetive.Taking the BD oilfield in the North Sea of the UK as an ex-ample,core and rock fragment mineral assemlage were analized and geochemical elements indicative to ancient sources,ancient climate,and ancient sedimentary environment were screened.Following the idea of"Hierarchic-al Progression",a macroscopic stratigraphic framework was established at first based on the deep-water turbidite mudstone background,then the internal sand bodies were finelly correlated within the macroscopic framework,from which an inorganic geochemical sedimentary sequence was established in the target area.Finanlly,the deep-water turbidite sandstone formation of the oilfield was finely divided in chemo-stratigraphy.Among nearly 50 mineral elements identified in the target area,three principal components(PC1,PC2,PC3)were selected through principal component analysis.PC1 reflects symbiotic mineral combination that matches mudstone,PC2 is a sym-biotic mineral combination that matches sandstone,and PC3 indicates the degree of late diagenesis.Based on the analysis on the coexisting mineral elements in sandstone and mudstone,the key chemical element ratios of coex-isting minerals(6 for sandstone and 5 for mudstone)were selected to distinguish between mudstone and sand-stone units,thereby establishing a chemo-stratigraphy scheme as the identification and division standards applic-able to the area,with which 6 sets of mudstone layers(CP0 to CP5)and 7 sets of sandstone layers(SP0 to SP6)in the target layers were recognized.The method provided a tool for fine stratigraphic correlation of small layers sim-ilar to the similar cases of oil fields.关键词
元素地球化学/深水浊积/共生矿物/小层精细划分/英国北海Key words
geochemical element/deep-water turbidite/paragenetic minerals/fine stratigraphic division/North Sea of UK分类
海洋科学引用本文复制引用
卜范青,杨莉,曹树春,赵军寿,刘励云..化学元素在英国北海深水浊积油田小层精细划分的实践应用[J].海洋地质前沿,2025,41(12):88-95,8.基金项目
中国海洋石油有限公司"十四五"重大科技项目"'两岸一带'深水浊积砂岩油田高效开发关键技术"(KLGG2022-0904) （KLGG2022-0904）
