| 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 |
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| 引用本文： | 石开波,蒋启财,刘波,潘文庆,田景春.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[J].岩石学报,2017,33(4):1204-1220. |
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| 作者姓名： | 石开波 蒋启财 刘波 潘文庆 田景春 |
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| 作者单位： | 北京大学地球与空间科学学院, 北京 100871;北京大学石油与天然气研究中心, 北京 100871,北京大学地球与空间科学学院, 北京 100871;北京大学石油与天然气研究中心, 北京 100871,北京大学石油与天然气研究中心, 北京 100871,塔里木油田勘探开发研究院, 库尔勒 841000,成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059 |
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| 基金项目： | 本文受中国地质调查局项目（DD20160175-1-1）和国家自然科学基金项目（41272137、41572117）联合资助. |
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| 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。
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| 关 键 词： | 塔里木盆地 库鲁克塔格 寒武纪-奥陶纪 沉积特征 沉积模式 碳酸盐岩台地 |
| 收稿时间： | 2016/8/20 0:00:00 |
| 修稿时间： | 2016/12/7 0:00:00 |
Sedimentary characteristics and evolution of Cambrian-Ordovician in Quruqtagh area, NE Tarim Basin, Xinjiang |
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| SHI KaiBo,JIANG QiCai,LIU Bo,PAN WenQing and TIAN JingChun.Sedimentary characteristics and evolution of Cambrian-Ordovician in Quruqtagh area, NE Tarim Basin, Xinjiang[J].Acta Petrologica Sinica,2017,33(4):1204-1220. |
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| Authors: | SHI KaiBo JIANG QiCai LIU Bo PAN WenQing and TIAN JingChun |
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| Institution: | School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Oil and Gas, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Oil and Gas, Peking University, Beijing 100871, China,Institute of Oil and Gas, Peking University, Beijing 100871, China,Institute of Exploration and Development, Tarim Oil Field, Korla 841000, China and State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China. |
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| Abstract: | The Cambrian-Ordovician strata are preserved relatively intact in Quruqtagh of the Tarim Basin. It is significance to Cambrian-Ordovician hydrocarbon exploration in eastern Tarim Basin that a systematic study on the sedimentary characteristics and evolution of Cambrian-Ordovician in Quruqtagh area is carried out. In this paper, based on filed geological surveying and combined with published research achievements, we have discussed sedimentary characteristics, depositional model and evolution of Cambrian-Ordovician in Quruqtagh area. Study shows that Quruqtagh area experienced a second order transgression-regression cycle during Cambrian and there is a similar sedimentary characteristics in north and south region. In the early Cambrian, a rapid transgression result in deep-water shelf and basin depositional environment both north and south region; in the Late Cambrian, under the background of gradual regression, depositional environment began to appear a differentiation between north and south region. In Ordovician, Quruqtagh area experienced a new second order transgression-regression cycle and there is a significant sedimentary difference between north and south region. In north Quruqtagh, carbonate rock is dominant and development of the upward shallowing depositional facies sequence which consists of platform-marginal slope facies, open shelf facies, platform-marginal reef and shoal facies, open platform facies. In south Quruqtagh, clastic rock is dominant and development of the great thick deep-water flysch formation which consists of deep-water basin facies, shelf slope facies, turbidite deposit basin facies, clastic shelf facies. Carbonate ramp develop in Cambrian and margin steepen in the Early Ordovician due to platform building to the south and fault activity result in gravity flow deposit. On the basis of filling and leveling up, carbonate ramp develop again in the Middle Ordovician. In the Late Ordovician, suffering from periphery tectonic activity, Queerquek Mountain to Yaerdang Mountain area subside and development of distally steeped ramp. |
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| Keywords: | Tarim Basin Quruqtagh Cambrian-Ordovician Sedimentary characteristic Depositional model Carbonate platform |
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