Rodinia Ma 8 Fig. 1 1 Distribution and tectonic unit divisions of the Tarim Basin

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1 ACTA SEDIMENTOLOGICA SINICA Vol. 31 No. 5 Oct Haq δ 18 O lincs58@ cugb. edu. cn TE A ~ CB km 2

2 Rodinia Ma 8 Fig. 1 1 Distribution and tectonic unit divisions of the Tarim Basin

3 ~ 700 m 20 ~ 50 m 120 ~ 900 m 50 ~ 500 m 50 ~ 200 m 50 ~ 100 m ~ 500 m m 400 m ~ 700 m m 3. 1

4 Fig. 2 2 Sequence classification and depositional evolution of the Ordovician system in the Tarim Basin Msb7 7 Msb1 Msb2 Msb3 7 composite sequences Msb4 8 ~ 12 Ma Msb5 Msb6 2 Msb

5 911 Table 1 1 Facies associations of the Ordovician carbonate system in the Tarim Basin 1 2 3 4 5 6 7 3 Fig.

5 5 911 Table 1 1 Facies associations of the Ordovician carbonate system in the Tarim Basin Fig. 3 A B Depositional sequence architecture interpretation of 3-D seismic profiles across the Ordovician platform margins in the northern slope zone of the Tazhong A and Tabei B uplifts

6 Fig. 4 4 Well log-based correlation of the sequences of the Ordovician in the Tazhong uplift CS1 CS 层序单元 CS1 CS1 Msb3 300 ~ 700 m CS1 Msb

5 913 CS1-1 3 CS1-2 CS1-2 CS1 40 ~ 60 m 4 CS1-2 CS1-2 3. 2. 2 层序单元 CS2 CS2 Msb2 5 3 Fig.

7 5 913 CS1-1 3 CS1-2 CS1-2 CS1 40 ~ 60 m 4 CS1-2 CS 层序单元 CS2 CS2 Msb2 5 3 Fig. 5 Well log-based interpretation of karst cave system noting that the alternatively developed reservoir beds grainstone dominated and the impermeable beds mudstone or wackstone dominated in the phreatic zone Tazhong uplift CS2 CS2 2 CS2-1 CS2-2 CS2-4 2 CS1 4 3 ~ 4 CS1 CS1-1 CS1-2 CS CS2-2

8 ~ 100 m 层序单元 CS3 CS3 3 4 CS3 3 CS3-1 CS CS 层序 CS4 CS4 Msb SC ~ m 9 12 SC4 3 SC

9 5 915 Fig. 6 6 Schematic map showing the paleogeography and the distribution of carbonate platform margins of the Ordovician Tarim Basin Fig. 7 7 Paleo-geomorphological reconstruction of the Ordovician carbonate platform margins reconstructed by flattening depositional horizons on the seismic profile from the north of the Tazhong paleo-uplift to the margin of the Manjiaer depression

10 CS2 SC1 SC3 SC Haq Msb1 Haq Ma SC1

5 917 Haq Msb1 8 SC3 δ 18 O - 2. 5 ~ Haq - 6. 8 δ 18 O δ 13 C 471 Ma 8 455. 5 Ma 450 Ma δ 18 O SC4 MSb3 MSb4 SC4 δ 18 O 5 SC4 SC1 6 4 SC4 Haq 8 10 2001 14 8 Fig.

11 5 917 Haq Msb1 8 SC3 δ 18 O ~ Haq δ 18 O δ 13 C 471 Ma Ma 450 Ma δ 18 O SC4 MSb3 MSb4 SC4 δ 18 O 5 SC4 SC1 6 4 SC4 Haq Fig Sea-level onlap curves established along the slope margins in the Tabei A and in Tazhong B paleouplifts. The relative sea-level change curve C D is mapped based on the borehole logging data in the areas

12 References 1 Li Desheng Liang Digang Jia Chengzao et al. Hydrocarbon accumulation in the Tarim Basin China J. AAPG Bulletin M Jia Chengzao. The tectonic characteristics and oil & gas in Tarim Basin China M. Beijing Petroleum Industry Press J Jia Chengzao Wei Guoqi. Structural char- acteristics and petroliferous features of Tarim Basin J. Chinese Science Bulletin Suppl J 2008 Tarim Basin J 5 Lin Changsong Yang Haijun Liu Jingyan et al. Sequence architecture and depositional evolution of the Ordovician carbonate platform margins in the Tarim Basin and its response to tectonism and sea lev- el change J. Basin Research Lin Changsong Yang Haijun Liu Jingyan geography during deformation J Doi /j. jseaes M tion and Metallization in the Eastern Tianshan Belt M logical Publishing House Han Baofu He Guoqi Wu Tairan et al. Zircon U-Pb dating and geochemical features of Early Paleozoic granites from Tianshan Xinjiang implications for tectonic evolution J. Xinjiang Geolo- gy CS1-CS4 J SC1 SC2 SC Lin Changsong Liu Jingyan K. Eriksson et al. Ordovician deepwater gravity-flowdeposits palaeogeography and tectonic setting Tar- δ 18 O imbasin Northwest China J Lin Changsong Yang Haijun Liu Jingyan et al. Paleohigh geomorphology and paleogeographic framework and their controls on the formation and distribution of stratigraphic traps in the. Oil & Gas Geology et al. Distribution and erosion of the Paleozoic tectonic unconformities in the Tarim Basin Northwest China Significance for the evolution of paleo-uplifts and tectonic. Journal Of Asian Earth Sciences Ma Ruishi Shu Liangshu Sun Jiaqi. Evolu-. Beijing Geo-. U-Pb J D Lin Changsong Yang HaiJun Liu JingYan et al. Paleostructural geomorphology of the Paleozoic central uplift belt and its constraint on the development of depositional facies in the Tarim Basin J. Science China Seri. D Earth Sciences Basin Research

13 5 919 J Chen Ming Xu Xiaosong Wan Fang et al. Study on outcrop sequence stratigraphy of the Lower-Middle Ordovician strata in Keping Tarim Basin J. Acta Sedimentologica Sinica North China Platform J. Science China Seri. D Earth Sciences J Xiong Jianfei Wu Tao Ye Desheng. New advances on the study of Middle-Late Ordovician conodonts in Bachu Xingjiang J. Acta Palaeontologica Sinica Haq B U Stephen R S. A chronology of Paleozoic sea-level changes J. Science J. D Yu Bingsong Chen Jianqiang Lin Changsong. Cambrian-Ordovician sequence stratigraphy on the northern Tarim Platform and its correlations with Yangtze Platform and 15. J Yang Jiedong Wang Zongzhe. C O and Sr isotops of Early Paleozoic strata in the Kalpin area Xinjiang J. Geological review Evolution of Depositional Architecture of the Ordovician Carbonate Platform in the Tarim Basin and Its Response to Basin Processes LIN Chang-song 1 YANG Hai-jun 2 CAI Zhen-zhong 2 YU Bing-song 1 CHEN Jian-qiang 1 LI Hao 1 RUI Zhi-feng 1 1. China University of Geosciences Beijing PetroChina Tarim Oilfield Company Kuerle Abstract The Tarim Basin contains extensive carbonate platform deposits of the Ordovician System with more than three thousand kilometers of rimmed carbonate platform margins. Comprehensive analysis of seismic borehole and outcrop data reveals that the Ordovician carbonate system in the basin can be divided into four composite sequences defined by major unconformities. Ten sequence consists of a regional depositional cycle from transgression with an onlapping transgressive systems tract TST to regression with a prograding highstand systems tract HST and can be further subdivided into eight third-order sequences based on subordinate discontinuous boundaries at the carbonate platform marginal zones. Constrained by the marginal slope of the early-rifted Manjiaer aulacogen the carbonate platform margins of the Lower and Middle Ordovician that prograded eastward in an arcuate belt extending generally northsouth across the northern part of the basin. The development of the Tazhong uplift resulted in an extensive unconformity between the Middle and the Upper Ordovician in the south-central basin and subsequently constrained the formation of an isolate carbonate platform with their margins controlled by marginal thrust-fault belts of the paleo-uplift during the Late Ordovician. In the northern basin the Late Ordovician carbonate platform margin developed around the marginal slope of the Tabei paleouplift. The transgressive regressive cycles of the carbonate system are comparable and seem to have occurred simultaneously across the entire basin suggesting that the cyclic sequence architecture was fundamentally controlled by eustatic fluctuations. The reef shoal facies complexes that developed along the platform margins with paleokarst development at unconformities constitute the major reservoir of large petroleum reserves in the basin. Key words carbonate platform sequence architecture depositional evolution Ordvician Tarim Basin

km t 2 4 Fig Tectonic divisions of Siberian platform

km t 2 4 Fig Tectonic divisions of Siberian platform 31 1 2012 3 GLOBAL GEOLOGY Vol. 31 No. 1 Mar. 2012 1004 5589 2012 01 0139 09 1 1 2 1 1 1 1. 130061 2. 130061 - P168. 130. 2 A doi 10. 3969 /j. issn. 1004-5589. 2012. 01. 017 Reserch on hydrocarbon accumulation