古城地区碳酸盐岩沉积特征及其主控因素

发布时间：2018-05-16 03:28

本文选题：碳酸盐岩 + 沉积相　；参考：《特种油气藏》2016年05期

【摘要】：通过岩心精细描述、薄片鉴定、测井和地震特征及古地貌等分析,认为塔里木盆地古城地区寒武—中晚奥陶世主要处在台地—台地边缘—台缘斜坡相带,发育台内滩、台地边缘滩(礁滩复合体)、滩间海、台缘斜坡等微相类型。中下奥陶统鹰山组三段台缘滩和中上寒武统发育的纵向叠置的台缘丘滩体是有利的沉积相带,也是下一步勘探的重点。古地貌特征及其演化控制着沉积相带及礁滩体的分布,台缘坡折带决定了台缘带的分布位置,古地貌高隆区控制着台缘滩的发育。塔东地区沉积相演化主要受海平面升降控制,表现为台地类型的变化和台地边缘相带的迁移。探讨古城地区碳酸盐岩台地沉积微相特征及主控因素,圈定有利沉积相带,对于该区下步油气勘探具有重要的指导意义。
[Abstract]:Based on the analysis of fine core description, thin section identification, logging and seismic characteristics and paleogeomorphology, it is concluded that the Cambrian-Middle late Ordovician in the ancient city area of Tarim Basin is mainly located in the platform margin slope facies belt and developed platform inner beach. Platform marginal beach (reef and beach complex, inter-beach sea, platform margin slope and other microfacies types). The platform margin beach of the third member of the Yingshan formation of the middle and lower Ordovician and the platform margin shoal body developed in the middle and upper Cambrian are favorable sedimentary facies zones, and are also the focus of exploration in the next step. Paleogeomorphology and its evolution control the distribution of sedimentary facies and reef shoal. The platform margin slope break zone determines the distribution position of platform margin belt, and paleomorphology high uplift area controls the development of platform margin beach. The evolution of sedimentary facies in Tadong area is mainly controlled by sea level rise and fall, which is manifested by the change of platform type and the migration of platform margin facies belt. The study of sedimentary microfacies characteristics and main controlling factors of carbonate platform in Gucheng area and the delineation of favorable sedimentary facies zone are of important guiding significance for the next step of oil and gas exploration in this area.
【作者单位】：核工业北京地质研究院;中核集团铀资源勘查与评价技术重点实验室;中国地质大学(北京);
【基金】：国家重点基础研究发展计划“973”项目“中国西部叠合盆地深部有效碳酸盐岩储层形成机制与分布预测”(2011CB201100-03) 国家自然科学基金重点项目“塔里木盆地古生代古构造、古地理演变与成藏效应”(41130422)
【分类号】：P618.13

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