南黄海盆地中部隆起上古生界沉积环境探讨

CSDP-2井是大陆架科学钻探计划（CSDP）在南黄海盆地中部隆起实施的第一口连续取芯井，完井深度2 843.18 m，平均取芯率高达97.7%。综合利用该井岩芯、测井、岩石薄片及古生物化石资料，准确识别出南黄海盆地中部隆起上古生界的岩石类型、沉积构造、岩性组合序列等特征，进而探讨研究区沉积环境及其垂向演化规律。研究结果显示:CSDP-2井所钻遇的二叠系、石炭系、泥盆系地层既包含碎屑岩也包含碳酸盐岩，发育了三角洲相、滨岸相、潮坪相、碳酸盐岩台地相、浅海陆棚相等多种沉积相类型；南黄海盆地晚古生代先后经历了两个完整的海侵-海退旋回，自下而上发育碎屑岩浅海-潮坪沉积体系、碳酸盐岩潮坪-潟湖-颗粒滩沉积体系和碎屑岩三角洲沉积体系，反映了研究区由海相向海陆过渡相逐渐演化的沉积充填过程。

Depositional Environment of Upper Paleozoic in the Central Uplift of the South Yellow Sea Basin

Well CSDP-2 is the first overall coring well implemented by the Continental Shelf Drilling Program (CSDP) in the Central Uplift of the South Yellow Sea Basin, eastern China, whose completion depth is 2 843.18 m and mean drill-core rate is up to 97.7%. Based on the property of cored rocks, logging data, rock thin sections and other test data of Well CSDP-2, it is accurately distinguished in this paper that the rock types, sedimentary structures and lithological association sequences of Upper Paleozoic rocks in the Central Uplift of the South Yellow Sea Basin and then discuss their related sedimentary environments and vertical variations. The Devonian-Carboniferous-Permian strata drilled by Well CSDP-2 contain not only clastic rocks but also carbonate rocks and develop many sedimentary facies including delta, shore, tidal flat, carbonate platform and shallow shelf. In addition, the South Yellow Sea Basin has been experienced 2 completed transgressive-regressive cycles. Controlled by this mechanism, this region developed a clastic depositional system of sea-tidal flat, a carbonate depositional system of tidal flat-lagoon-grain beach, and a delta depositional system from bottom to top, indicating a sedimentary filling process from marine facies to transitional facies.