Fig. 1 The plane relations between the bottom boundary of the T3ySQ4 sequence stratigraphic unit and the boundaries of the conventional

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1 ACTA SEDIMENTOLOGICA SINICA Vol. 28 No. 4 Aug / / / lixiangbo911@ sina. com TE A 0 1 ~ ~ 8 A /S

2 Fig. 1 The plane relations between the bottom boundary of the T3ySQ4 sequence stratigraphic unit and the boundaries of the conventional rock stratigraphic unit central Yanchang Formation T3ySQ1 T3ySQ2 T3ySQ3 T3ySQ4 T3ySQ5 T3ySQ Ma ~ 210 Ma 21 Ma Vail T3ySQ ~ 13 T3ySQ T3ySQ4

3 a. A A T3ySQ4 b. B B T3ySQ4 Fig. 2 Relationship between sequence stratigraphic units and conventional rock stratigraphic units in the middle of the Yanchang Formation profile position see Fig T3ySQ4 T3ySQ / 3a T3ySQ3 8 1 b 8 1 3b 2 / 2 ~ 6 cm 3c m 8 1 3b 4 5% 8 1 9%

4 C ~ μm μm M μm C M Y = 4b μm. 80% ~ 70% 20% ~ 30% y C = x M C M 4a 20 3 a m b km 20 m c. b / 2 ~ 6 cm. Fig. 3 Sedimentary structures in sandy debrite of the Yanchang Formation Fig C M a b C M a and grain-size curve b of the Chang 6 3 sandstones of Well Zhang 31 in Heshui area

5 b c ABC- 1 DE ABE ACD BCD BC CDE DE c m 4 5d 5 C M C M m 5a 2 5e 5 a. A m ABC m Fig. 5 b. AE m c. a d m Sedimentary structures of the classic turbidite and the fluxoturbidite in Yanchang Formation Ordos basin

6 S T3ySQ km 3. 2 T3ySQ4 T3ySQ T3ySQ A A Fig. 6 1 Seismic profile showing the features of the deep-water slope break in the northeastern basin see Fig. 8 for profile position A A

7 4 723 Fig B B Seismic profile showing the features of the deep-water slope break in the northwestern basin see Fig. 8 B B Fig. 8 8 T3ySQ4 Sandstones thickness contour map of LST lowstand systems tracts of T3ySQ4 showing how the slope break belt control the distribution of the sandstone T3ySQ4 T3ySQ3 T3ySQ3 T3ySQ3 T3ySQ

8 Fig. 9 9 T3ySQ3 T3ySQ4 a. T3Ysq4 b. T3ySQ3 Slope break belt developing model of T3ySQ3 and T3ySQ T3ySQ ~ 10 m m 30 m ~ 10 m 4 5 ~ 10 m 40 m

9 T3ySQ Fig. 10 Sandstones developing model of the LST of T3ySQ4 in Yanchang Formation T3ySQ μm % ~ 12% 8% ~ 10% 12% ~ 14% 8% ~ 10% 6% ~ 8% 10% ~ 12% μm 2 11 Fig T3ySQ4 a. T3ySQ4 b. T3ySQ4 c. T3ySQ4 d. T3ySQ4 Porosity and permeability histograms of LST of T3ySQ4 in the central lacustrine Baibao-Heshui area

10 t 10 t 5 12 / / / T3ySQ4 Fig T3ySQ3 T3ySQ4 Reservoir sections of T3ySQ3 and T3ySQ4 the middle of the Yanchang Formation

11 Liu Chiyang Zhao Hongge Gui Xiaojun et al. Space-time coordinate of the evolution and reformation and mineralization response in Ordos Ba- Formation Ordos Basin J J Ordos Basin J J. sin J. Acta Geologica Sinica J gas Reservoirs Distribution in Ordos Basin J dustry Press Yang Hua Liu Xianyang Zhang Caili et al. The main controlling factors and distribution of low permeability lithologic reservoirs of Trias- 6 sic Yanchang Formation in Ordos Basin J References J. J Fan Tailiang Li Weidong. A successful case on sequence stratigraphy applied to the prediction of nonmarine oil reservoir J. Acta Petrolei Sinica Acta Geologica Sinica J Lin Changsong Pan Yuanlin Xiao Jianxin et al. Structural slopebreak zone Key concept for stratigraphic sequence analysis and petroleum forecasting in fault subsidence basins J. Earth Science J. J Wang Yingmin Liu Hao Li Licheng et al. Types and distribution characteristics of slope breaks of large-type down-warped lake basins J. Earth Science J Zhang Shanwen Wang Yingmin J L i Qun. Searching subtle traps using the theory of slope break J. Petroleum Exploration and Development Li Shutong Wang Duoyun Wang Bin et al. Identification of sedimentary slope breaks in the margin of a down warped lake basin's ramp belt A case from Triassic Yanchang. Natural Gas Geoscience Li Desheng. Return to petroleum geology of. Petroleum Exploration and Development Yang Junjie. Tectonic Evolution and Oil-. Beijing Petroleum In- 9. J Lithologic Reservoirs. J. Yang Youyun. Characteristics of the depositional systems and sequence evolution of the Yanchang Formation in the southern Ordos Basin J. Geological Bulletin of China Zhang Xingyang Luo Ping Gu Jia yu et al. Establishment of the delta sandbody framework model in a 3rd order baselevel cycle taking Shanbei-Ansai delta outcrop as example J. 12. M Xie yuan Wang Liu jiaduo et al. Sequence Stratigraphic Framework of the Triassic Yancang Formation in the Ordos Basin and Petroleum Exploration J. Beijing Geological Publishing House Mao Minglu Li Yuanhao. Sequence-stratigraphic features of Yanchang Formation Triassic system in Ordos Basin J. Low Permeability Reservoirs Li Xiangbo GuoYanru Liu Huaqing et al. The application of wavelet analysis in sequence stratigraphic subdivision of 5. the Yanchang Formation Ordos Basin J. Natural Gas Geoscience J

12 Shanmugam G. The Bouma sequence and the turbidite mind set J. Earth Science Reviews Shanmugam G Moiola R J. Reinterpretation of depositional processes in a classic flysch sequence Pennsylvanian Jackfork Group Ouachi- 15. ta Mountains Arkansas and Oklahoma J. AAPG Bulletin 1995 J GuoYanru Liu Huaqing Li Xiang bo et al. Method system on studying sequence stratigraphic framework of large sagged lacustrine basin a case study from Mesozoic Yanchang Formation Ordos Basin J. Acta Geologica Sinica J Cao Ying chang Liu Hui. Discussion on the relationship between distribution of fluxoturbidite and depositional slope of delta in lacustrine basin J. Geological Review Hampton M A. The role of subaqueous debris flows in generating turbidity J Wang Jiangong. Sedimentary mode of shallow lacustrine delta of large continental basin An example from Putaohua Formation in northern Songliao Basin J. Lithologic Reservoirs currents J. Journal of Sediment Research J Chen Quanhong Li Wenhou Guo Yanqin et al. Turbidite systems J and the significance of petroleum exploration of Yanchang Formation in 825 Zou Caineng Zhao Wenzhi Zhang Xingyang et al. Formation and distribution of shallow water deltas and central basin sandbodies in large open depression lake basins J. Acta Geologica Sinica Li Xiangbo Liu Huaqing Wan Yanrong et al. First discovery of the sandy debris flow from the Triassic Yanchang Formation Ordos Basin J. Lithologic Reservoirs J Liu Huaqing J Xia Qingsong Tian Yuan Jianying Li Xiangbo et al. Lake basin evolution of Ordos Basin during Middle-LateTriassic and its origin analysis J. Lithologic Jingchun. Sedimentary characteristics of sublacustrine fan of the Interval 6 of Yanchang Formation of Upper Triassic in southwestern Ordos Reservoirs Basin J. Journal of Palaeogeography Shanmugam G. High-density turbidity currents are they sandy debris flows J. Journal of Sedimentary Research Shanmugam G. 50 years of the turbidite Paradigm 1950s-1990s deep-water processes and facies models - a critical perspective J. Marine and Petroleum Geology J. D Ⅰ Meng Qingreng Qu Hongjie Hu Jianming. Triassic deep-marine sedimentation in the western Qinling and Songpan terrane J. Science in China Series D Earth Sciences the Southern Ordos Basin J. Acta Geologica Sinica J. D Chen Quanhong Li Wenhou Gao Yongxiang J et al. The significance of hydrocarbon accumulation and deep lacustrine sediment of Yanchang Formation Upper Triassic in Ordos Basin J. Science in China Series D Earth Sciences D Li Xiangbo. Late Triassic O- riginal Basin Reconstruction of the Ordos Basin and It's Petroleum Geological Significance D. Graduate University of Chinese Academy of Sciences 2007 Characteristics of Slope Break Belt in Large Depression Lacustrine Basin and Its Controlling Effect on Sandbody and Petroleum Taking the Triassic Yanchang Formation in the Ordos Basin as an example LI Xiang-bo LIU Hua-qing CHEN Qi-lin WANYAN Rong WEI Li-hua FENG Ming LIAO Jian-bo MA Yu-hu Research Institute of Petroleum Exploration & Development-Northwest PetroChina Lanzhou Abstract The viewpoint that slope break belt developed both in the marine basin and the nomarine rift basin played

13 4 729 important controlling effect on sequence and sediment frameworks has got extensive concern and been widely accepted in recent years. According to the combination characteristic of seismic profiles and sedimentary microfacies studies on the Triassic Yanchang Formation in the Ordos basin show that sedimentary slope break belts were also developed in the large depression lacustrine basin and could be clearly recognized either in the deep water or in the shallow water. Deposits of the deep-water gravity flows such as the sandy debris flows and the turbidity flows were mainly controlled by the slope break belt in deep water whereas deposits of tractive current like subaqueous distributary channels in the delta-front were controlled by that in the shallow water. Further studies suggest that except for sandbody origin types the deep-water and shallow-water sedimentary slope breaks also have obvious controlling effect on thickness plane distribution and physical properties of the sandstones. In addition is suggested that petroleum distribution was also controlled to a certain extent by the slope break belt. Although oil reservoirs can be found everywhere in the Yanchang Formation most of the larger lithologic reservoirs are located either below the slope breaks or in the LST lowstand systems tracts sandstones neighboring the sequence boundary or controlled by both of the slop break belt and the sequence boundary. Key words slope break belt sandy debris flow sedimentary gravity flow depression lacustrine basin Yanchang Formation Ordos Basin 檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵檵 IAS special meeting sedimentology Finn Surlyk Finn Surlyk IAS Specialized meeting Summer school 2013 IAS Summer school 30 Special meeting IAS IAS

( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary fa

( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary fa 27 3 2006 5 ACTA PETROL EI SIN ICA Vol. 27 No. 3 May 2006 : 0253Ο2697 (2006) 03Ο0027Ο05 1 2 2 2 (11 610059 ; 21 062552) : 2 ; : ; ;; ;; : TE1111 3 : A Forming pattern and distribution features of hydrocarbon