Tectonic-depositional environment and proto-type basins evolution of the Ordovician in Sichuan Basin and adjacent areas

doi:10.7623/syxb201504004

Acta Petrolei Sinica ›› 2015, Vol. 36 ›› Issue (4): 427-445.DOI: 10.7623/syxb201504004

• Petroleum Exploration • Previous Articles Next Articles

Tectonic-depositional environment and proto-type basins evolution of the Ordovician in Sichuan Basin and adjacent areas

Li Jiao, He Dengfa, Mei Qinghua

Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism of the Ministry of Education, China University of Geosciences, Beijing 100083, China

Received:2014-09-10 Revised:2015-01-20 Online:2015-04-25 Published:2015-04-04

四川盆地及邻区奥陶纪构造-沉积环境与原型盆地演化

李皎, 何登发, 梅庆华

中国地质大学海相储层演化与油气富集机理教育部重点实验室北京 100083

通讯作者: 何登发,男,1967年12月生,1989年毕业于西北大学地质学系,1995年获北京石油勘探开发研究院博士学位,现为中国地质大学(北京)教授、博士生导师,主要从事含油气盆地构造分析研究。Email:hedengfa282@263.net
作者简介:李皎,女,1990年2月生,1990年获中国地质大学(北京)学士学位,现为中国地质大学(北京)硕士研究生,主要从事沉积盆地构造特征研究。Email:lijiao_cugb@qq.com
基金资助:
国家自然科学基金重点项目(No.40739906)和国家重大科技专项(2011ZX05008001)资助。

Abstract

Abstract:

The Ordovician strata are important marine carbonates in China. At present, a series of large oil and gas fields have been discovered in Tarim Basin and Ordos Basin, but no breakthrough has been achieved in the Ordovician strata of Sichuan Basin. The research and restoration of Ordovician tectonic-sedimentary environment provides a basis for studying the tectonic history of Sichuan Basin and adjacent areas and predict the favorable Ordovician reservoir facies belt. According to field outcrop, drilling, logging, seismic and geochemical data, as well as the surrounding tectonic environment, sedimentary facies and filling, paleo-geography, paleo-ecology and tectonic deformation, the tectonic-sedimentary environment of Sichuan Basin in different Ordovician periods was rebuilt by combining basin-filling evolution with the surrounding uplift and trough evolution. Meanwhile, the uplift property and prototype basin evolution were explored. Sichuan Basin and adjacent areas present the composite properties of intra-craton depression and craton-margin depression facies in Ordovician. The surrounding dynamic environment has evolved from tension to extrusion, mainly shown in two kinds of mechanism, i.e., basement subsidence and uplift. Basin surroundings are craton-margin depression basins, dominated by deep-water basin facies. The central part of study area is intra-craton depression basin, experiencing two large cycles of sea level eustasy. The sedimentary sequence is shown as the Early Ordovician rimmed platform→ the Middle Ordovician hybrid continental shelf-rimmed platform→ the Late Ordovician slope-deep water continental shelf facies sediments from bottom to top. The demise of the Middle Ordovician paleo-South China Sea basin and the intra-continent orogeny of South China Plate led to constant lifting and propagation of the central Sichuan uplift, central Guizhou uplift and other basin margin uplifts as well as the continuous rising of sea level. Till the sedimentary period of the Late Ordovician Wufeng Formation, the basement settled rapidly to form the deep-water continental-shelf sedimentary environment, indicating an abrupt change in basin properties and the termination of carbonate platform sedimentary history since Sinian.

Key words: tectonic-depositional environment, proto-type basin, Ordovician, evolution, Sichuan Basin

摘要：

奥陶系是中国重要的海相碳酸盐岩层系。目前,在塔里木、鄂尔多斯盆地奥陶系发现一系列大型油气田,但在四川盆地奥陶系至今仍未取得突破。研究和恢复奥陶纪的构造-沉积环境是研究四川盆地及邻区的构造历史和预测奥陶系有利储集相带的基础。根据野外露头、钻井、测井、地震和地球化学资料,从周缘大地构造背景、沉积相、沉积充填、古地理、古生态、构造变形出发,将盆地充填演化与周缘隆起、海盆演化相结合,重建了四川盆地奥陶纪不同时期的构造-沉积环境,并探讨了隆起性质和原型盆地演化。四川盆地及邻区在奥陶纪表现为克拉通内坳陷和克拉通边缘坳陷相复合的盆地性质,周缘动力学环境经历了拉张→挤压的演变,主要体现在基底沉降以及隆起/隆升两种机制上。盆地周缘为克拉通边缘坳陷盆地,主要为深水盆地相。研究区中部为克拉通内坳陷盆地,经历了两次大的海平面升降旋回,沉积序列由下向上表现为早奥陶世镶边台地→中奥陶世混积陆棚—镶边台地→晚奥陶世缓坡—深水陆棚相沉积。中奥陶世古华南海盆的消亡,华南板块陆内造山,导致川中隆起、黔中隆起等盆地边缘隆起不断隆升和扩展,海平面持续上升,至晚奥陶世五峰组沉积期,基底快速沉降,形成深水陆棚沉积环境,标志着盆地性质的急剧转变,结束了自震旦纪以来的碳酸盐台地沉积历史。

关键词: 构造-沉积环境, 原型盆地, 奥陶纪, 演化, 四川盆地

CLC Number:

P548

Li Jiao, He Dengfa, Mei Qinghua. Tectonic-depositional environment and proto-type basins evolution of the Ordovician in Sichuan Basin and adjacent areas[J]. Acta Petrolei Sinica, 2015, 36(4): 427-445.

李皎, 何登发, 梅庆华. 四川盆地及邻区奥陶纪构造-沉积环境与原型盆地演化[J]. 石油学报, 2015, 36(4): 427-445.

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Tectonic-depositional environment and proto-type basins evolution of the Ordovician in Sichuan Basin and adjacent areas

四川盆地及邻区奥陶纪构造-沉积环境与原型盆地演化

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