塔里木盆地震旦纪沉积特征及岩相古地理

发布时间：2018-05-15 11:51

本文选题：塔里木盆地 + 震旦纪　；参考：《石油学报》2016年11期

【摘要】：震旦系可能成为塔里木盆地油气勘探潜力层系,对塔里木盆地震旦系分布及岩相古地理特征的准确认识是进一步勘探的基础,也是建立盆地早期构造-沉积演化历史的关键。通过对塔里木盆地周缘震旦系野外露头资料、盆内钻井资料以及地震资料的综合分析,结合前人发表的相关研究成果,对塔里木盆地震旦系分布、构造背景、沉积体系、岩相古地理特征进行探讨。研究表明,塔里木盆地震旦系发育3种类型沉积体系:碎屑岩沉积体系、碎屑岩—碳酸盐岩混合沉积体系、碳酸盐岩沉积体系,纵向上具有从碎屑岩沉积—碳酸盐岩沉积的演化特征。3种类型沉积体系与震旦纪3次"海侵—海退"旋回相对应,早震旦世初期(ZSQI期)的海侵形成了下震旦统下段碎屑岩沉积体系,早震旦世晚期(ZSQII期)的海侵形成了下震旦统上段碎屑岩—碳酸盐岩混合沉积体系;晚震旦世初期(ZSQIII期)的海侵形成了上震旦统碳酸盐岩沉积体系;3次海退过程形成下震旦统中部、顶部及上震旦统顶部3个不整合面。新元古代,伴随着Rodinia超大陆的解体,塔里木盆地进入大陆裂谷演化时期。震旦纪为克拉通内坳陷及被动大陆边缘演化阶段,具有"南隆北坳"的古地理特征。早震旦世,发育巴楚—塔中—塔东南隆起及塔北残余古陆,北部为滨海-陆棚环境,西南部为滨海-陆棚-半深海环境;晚震旦世,塔北古陆消失,北部为潮坪环境,西南地区为被动大陆边缘浅海环境。
[Abstract]:The Sinian system may become the potential series of oil and gas exploration in Tarim Basin. The accurate understanding of the distribution of the Sinian system and the lithofacies paleogeographic characteristics of the Tarim Basin is the basis of further exploration and the key to the establishment of the early history of tectonic-sedimentary evolution of the basin. Based on the comprehensive analysis of the field outcrop data of the Sinian system around the Tarim Basin, the in-basin drilling data and the seismic data, combined with the related research results published by the predecessors, the distribution, tectonic background and sedimentary system of the Sinian system in the Tarim Basin are analyzed. The characteristics of lithofacies and paleogeography are discussed. The results show that there are three types of sedimentary systems in the Sinian system in Tarim Basin: depositional system of clastic rock, mixed depositional system of clastic rock and carbonate rock, sedimentary system of carbonate rock. There are three types of sedimentary systems corresponding to the three Sinian "transgression and regression" cycles. The transgression formed the depositional system of clastic rocks in the lower member of the Lower Sinian and the late stage of ZSQII in the late early Sinian.) the transgression formed the mixed sedimentary system of clastic rocks and carbonate rocks in the upper member of the Lower Sinian. The transgression formed three regressive processes of carbonate sedimentary system in the Upper Sinian, forming three unconformities in the middle part of the Lower Sinian, the top of the Upper Sinian and the top of the Upper Sinian. Neoproterozoic, with the disintegration of Rodinia supercontinent, Tarim Basin entered the continental rift evolution period. The Sinian is the evolution stage of the inner craton depression and the passive continental margin, and has the paleogeographic characteristics of the "South uplift and North Depression". In the early Sinian, Bachu Tazhong Tazhong uplift and the remnant ancient land in northern Tarim, Binhai shelf environment in the north, littoral shelf semi-deep sea environment in the southwest, paleocontinent disappeared in the north and tidal flat environment in the northern part of the Tarim Basin in the late Sinian. The southwest area is a passive continental margin shallow sea environment.
【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;成都理工大学油气藏地质及开发工程国家重点实验室;中国石油塔里木油田公司勘探开发研究院;
【基金】：中国地质调查局项目(No.DD20160175-1-1) 国家自然科学基金项目(No.41272137,No.41572117)资助
【分类号】：P534.31

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