石油实验地质2016，Vol.38Issue(5)：559-568,10.DOI:10.11781/sysydz201605559
华北地台东部中奥陶世岩相古地理特征
Lithofacies Palaeogeography of the Middle Ordovician in the eastern North China Platform
摘要
Abstract
We subdivided the Middle Ordovician in the eastern North China Platform into five level 3 sequences using sequence stratigraphic classification and correlation in order to determine clear sedimentary patterns and evolution characteristics. Sequence palaeogeographic maps of sedimentary facies were drawn, and the coastal evolutions were de⁃scribed using detailed sequence isochronism. Persistent transgression occurred in the eastern North China Platform during the Middle Ordovician. Lithofacies palaeogeography at five different stages of the Middle Ordovician took the appearance of some inherited features coexisting with significant evolution. Paleotopography of five stages kept on pre⁃senting higher in the north and south, and in central North China there developed a quite complete sedimentary sequence. The paleogeographical environment was influenced by tectonics and sea level changes and the distribution pattern of sedimentary facies in each phase was different. With the growing marine transgression, restricted platform and open platform were prominent. The north-south symmetry of sedimentary facies manifested as a restricted platform located on both sides of the open platform. Overall, it was the sensitive feedback to sea level change of the epiconti⁃nental sea coupled with crustal uplift, that controlled the sedimentary cyclicity and rhythmicity of lithologic associa⁃tions, thus developing favorable source-reservoir-cap assemblages. It is worth mentioning, with beneficial Meso⁃Cenozoic preservation conditions, the Bohai Bay Basin is the most advantageous exploration area.关键词
沉积相/岩相古地理/层序地层/中奥陶世/华北地台东部Key words
sedimentary facies/lithofacies palaeogeography/sequence stratigraphy/Middle Ordovician/eastern North China Platform分类
能源科技引用本文复制引用
林玉祥,朱传真,赵承锦,吴玉琛,李佳,李秀芹..华北地台东部中奥陶世岩相古地理特征[J].石油实验地质,2016,38(5):559-568,10.基金项目
国家自然科学基金面上项目“沁水盆地煤层气与致密砂岩气共生成藏机理研究”（41172108）、国家重大专项“十三五”课题“中深层煤系地层立体勘探有利目标优选”（2016ZX05041005）和“岩性地层油气藏区带、圈闭评价方法与关键技术”（2016ZX05001003）联合资助。 （）
