| 塔里木盆地及周缘南华系和震旦系划分对比研究 |
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| 引用本文： | 吴林,管树巍,冯兴强,任荣,张春宇.塔里木盆地及周缘南华系和震旦系划分对比研究[J].岩石学报,2020,36(11):3427-3441. |
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| 作者姓名： | 吴林 管树巍 冯兴强 任荣 张春宇 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;中国石油勘探开发研究院, 北京 100083;中国石油勘探开发研究院, 北京 100083;中国海油研究总院有限责任公司, 北京 100029 |
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| 基金项目： | 本文受国家自然科学基金项目（41902158）和中国石油天然气股份有限公司科学研究与技术开发项目（2019B-04、2018A-0102、2016A-02）联合资助. |
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| 摘 要： | 塔里木盆地及周缘南华系、震旦系广泛发育,是揭示前寒武纪重大地质事件的重要地区之一,然而其研究程度低于华南、华北地区。早期认为塔里木盆地及周缘南华系、震旦系可划分为哈尔克山、柯坪、库鲁克塔格、铁克里克及塔克拉玛干等五个分区,由于各分区研究程度及资料之间的差异较大,且近期盆地内部钻井揭示越来越多,地层划分对比问题逐渐突出,传统分区方案面临诸多挑战。综合地质、地震等多学科资料认为,塔里木南华纪原型盆地基底、充填过程、分布统一具有南北分异的特征,区域地层格架剖面显示南华纪-震旦纪原型盆地分布于中央古隆起南北两侧,表现出北强南弱的不同地震反射特征。因此,本文以原型盆地中南、北分异的特征为原则进行地层分区,大致以现今中央隆起带南缘为界,分为北部地层分区和南部地层分区。北部可划分为东北部库鲁克塔格地层小区和西部阿克苏地层小区,其中阿克苏地层小区包括原方案中柯坪、塔克拉玛干北部、哈尔克山分区;南部初步划分出铁克里克地层小区,具体有待完善。震旦纪末期,受柯坪运动"大继承、小改造"的演化模式影响,北部地层分区广泛发育下寒武统烃源岩。因此,塔里木盆地及周缘新元古界分区新方案既符合南北不同的超大陆动力学背景,又控制下寒武统烃源岩分布,理论意义与勘探意义明显。
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| 关 键 词： | 塔里木盆地 南华系 震旦系 裂谷 地层划分对比 烃源岩 |
| 收稿时间： | 2020/5/1 0:00:00 |
| 修稿时间： | 2020/8/25 0:00:00 |
Discussion on stratigraphic division of the Nanhuan and Sinian of the Tarim Basin and its surrounding regions |
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| WU Lin,GUAN ShuWei,FENG XingQiang,REN Rong,ZHANG ChunYu.Discussion on stratigraphic division of the Nanhuan and Sinian of the Tarim Basin and its surrounding regions[J].Acta Petrologica Sinica,2020,36(11):3427-3441. |
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| Authors: | WU Lin GUAN ShuWei FENG XingQiang REN Rong ZHANG ChunYu |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083 China; Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083 China;Research Institute Co., Ltd, CNOOC, Beijing 100029, China |
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| Abstract: | The Neoproterozoic Nanhua and Sinian strata are widely developed in the Tarim Basin and its surrounding regions. It is one of the most important areas for revealing the major geological events in the Precambrian eras. However, its has a much lower research level than that in South China and North China. Previously, it was believed that the Neoproterozoic strata of the Tarim Basin and its surrounding regions could be divided into five stratigraphic zones:Harke Mountain, Keping, Kuruktag, Teklik, and Taklimakan. However, large research differences and updated drillings bring new challenges to the traditional division on the stratigraphic zones. Comprehensive geological and seismic data demonstrate that the basement, filling process, and distribution of the Nanhua prototype basins in Tarim are typically characteristized by a north-south ward differentiation. The regional stratigraphic framework sections show that the Nanhua-Sinian prototype basins are distributed in the north and south of the central paleo-uplift with different seismic reflections. Therefore, this paper uses the characteristics of the north-south differentiation of the prototype basins as a principle for stratigraphic zone, roughly dividing the southern margin of the current central uplift into the northern stratigraphic zone and the southern stratigraphic zone. The northern part can be divided into the Kuruktag stratigraphic zone in the northeast and the Aksu stratigraphic zone in the west; while the southern part is preliminarily divided into the Tieklik stratigraphic zone to which a further study is needed. In the Late Sinian, influenced by the Keping Movement, the Lower Cambrian source rocks were widely developed in the northern stratigraphic zone. Therefore, new Neoproterozoic zones proposed in this paper not only is consistent with the regional dynamics background, but also determines the distribution of the Lower Cambrian source rocks. As a result, it is of both theoretical and petroleum significances. |
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| Keywords: | Tarim Basin Nanhuan Sinian Rift Stratigraphic zone Source rock |
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