塔里木盆地东北缘库鲁克塔格地区寒武纪-奥陶纪沉积特征及演化

发布时间：2018-04-25 21:27

本文选题：塔里木盆地 + 库鲁克塔格　；参考：《岩石学报》2017年04期

【摘要】：库鲁克塔格地区保存了相对完整的寒武纪-奥陶纪沉积地层,其沉积特征及演化规律的研究,对塔东地区寒武系-奥陶系油气勘探具有重要意义。通过库鲁克塔格地区详细的野外地质调查,结合前人相关研究成果,对该区寒武系-奥陶系沉积体系、沉积模式及演化规律的研究表明,寒武纪时期,库鲁克塔格地区经历了一次大的海侵-海退旋回,南、北两区沉积具有相似性。寒武纪早期的快速海侵导致南、北两区均发育陆棚相-深水盆地相沉积;寒武纪晚期,在逐渐海退的背景下,南、北两区开始出现沉积分异。奥陶纪,经历了新一轮大的海侵-海退旋回,南北两区沉积差异显著。北区从早奥陶世到晚奥陶世,发育台地边缘斜坡相-广海陆棚相-缓斜坡相-台地边缘礁滩相-开阔台地相相序,构成整体向上变浅的碳酸盐岩沉积层序;而南区发育深水盆地相-陆棚斜坡相-浊流盆地相-碎屑陆棚相相序,形成一套巨厚的深水复理石建造。库鲁克塔格地区寒武纪时期发育缓坡型碳酸盐岩台地,因台地不断向南构筑以及断裂活动,导致奥陶纪晚期台地边缘快速变陡,并在经历斜坡相快速堆积填平补齐之后,重新演变为缓坡型碳酸盐岩台地。晚奥陶世,由于周缘构造活动影响,却尔却克山-雅尔当山一带下沉,逐渐向远端变陡缓坡型碳酸盐岩台地演化。
[Abstract]:The relatively complete Cambrian-Ordovician sedimentary strata have been preserved in the Kuruktag area. The study of their sedimentary characteristics and evolution rules is of great significance to the exploration of Cambrian-Ordovician oil and gas in the Tadong area. Based on the detailed field geological survey in Kuluktag area and previous related research results, the study of Cambrian-Ordovician sedimentary system, sedimentary model and evolution law shows that the Cambrian period, The Kuluktag area experienced a large transgression-sea regressive cycle, and the deposits in the south and north areas are similar. The early Cambrian rapid transgression resulted in the continental shelf facies and deep water basin facies deposits in both the north and the south, and in the late Cambrian, sedimentary differentiation began to occur in the southern and northern regions under the background of gradual regression. During the Ordovician period, there was a new round of transgression and regression cycle, and there were significant differences between the two regions. From early Ordovician to late Ordovician, platform margin slope facies, wide sea shelf facies, gentle slope facies, platform edge reef beach facies and open platform facies are developed in the northern region, forming a whole upward shallower carbonate sedimentary sequence. However, the deep water basin facies, shelf slope facies, turbidite basin facies and clastic shelf facies are developed in the southern region, forming a set of thick deep-water clayestone formations. During the Cambrian period of the Kuruktag area, gentle slope carbonate platform was developed. Because of the continuous southward construction of the platform and the activity of faults, the platform margin of the late Ordovician quickly steeped, and after the rapid accumulation of the slope facies, It has been redeveloped into a gentle slope carbonate platform. In the late Ordovician, due to the influence of the peripheral tectonic activity, the area of the Choltsoke-Yaldang Mountains sank and gradually evolved to the distal carbonate platform with steepening and gentle slope.
【作者单位】：北京大学地球与空间科学学院;北京大学石油与天然气研究中心;塔里木油田勘探开发研究院;成都理工大学油气藏地质及开发工程国家重点实验室;
【基金】：中国地质调查局项目(DD20160175-1-1) 国家自然科学基金项目(41272137、41572117)联合资助
【分类号】：P534.4;P618.13

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