Ma ~ 400 m Table 1 Division of the Upper Triassic and Lower Jurassic in Ordos Basin ~

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1 ACTA SEDIMENTOLOGICA SINICA Vol. 29 No. 5 Oct lishutong1979@ 163. com wdy@ ires. cn P A ~ ~ RJYA

2 Ma ~ 400 m Table 1 Division of the Upper Triassic and Lower Jurassic in Ordos Basin ~ Fig Stratigarphy Division of Lower Jurassic in Well Li15

3 ~ 180 m ~ 180 m m 20 m ~ 2 m ~ 38 m ~ 7 m 200 m 350 ms /m m ma 5 ~ 10 Ω /m ~ 110 m ~ 240 m ~ 240 m 200 m Fig. 2 2 Profile of stratigraphic correlation of Lower Jurassic in Shangliyuan area

4 5 965 Fig. 3 3 Palaeogeomorphology of pre-jurassic in Shangliyuan area Ordos Basin 3 80 ~ 160m 100 ~ 160m ~ 40 m A 2 4B 1 3 ~ 5 80%

5 Fig. 4 The genetic modes of oil-gas accumulation paleogeomorphology C

6 5 967 Fig. 5 5 Reservoir profile of lower Jurassic in Shangliyuan area J 5 1 Yan an Formation in southern Ordos Basin J. Journal of Paleogeog- 6 raphy J Zhao Junxing Chen Hongde Yang hua et al. Genetic types and their relationship with oil-gas accumulation of the lower and middle Jurassic Reservoirs in Ordos Basin China J. Journal of Chengdu University of Technology Science & Technology Edi- 2 tion J. References Kai Lü Jianwen Ling Shengjie et al. Paleogeomorphic features of the pre-jurassic and oil reservoir of Dingbian-Wuqi area in Ordos Basin. Journal of Paleogeography J Guo Zhengquan Zhang Lirong ChuMeijuan et al. Pre-Jurassic palaeogeomorphic control on the hydrocarbon accumulation in the Lower Guo Zhengquan Pan Linghong Liu Xianyang et al. The formation conditions and distribution of Jurassic palaeogeomorphological oil-field in Ordos Basin J. China Petroleum Exploration J Huang Yanran J Song Wen Zhigang He Wenxiang. Influence of early Jurassic eroded paleogeomorphology on reservoir distribution in Jiyuan area J. Special Oil

7 and Gas Reservoirs J. J Ou Mengchang Chen Shoumin. Relationship between Jurassic paleogeomorphology and hydrocarbon accumulation in northern Shaanxi J. Geology and Resources Zhao Junxing Chen Hongde Shi Zhiqiang. The way and implications of rebuilding paleogeomorphology Taking the research of paleogeomorphology of the Ordos Basin before Jurrasic deposition as an example J. Journal of Cheng- 7. du University of Technology J Zhao Junxing Chen Hongde. Evolution of Gan-Shaan paleochannel during early and middle Jurassic in Ordos Basin J. Oil & Gas Geology Earth Science Journal of China University of Geosciences M Li Baofang et al. Depositional System and Sequence Stratigraphy of Lower Jurassic in the Central Ordos Basin M. Beijing Geological Publishing House Tao Huifei Wang Duoyun Li Shutong et al. Relationship J between the Yangchang Formation top s paleogeomorphology and the 54 Shi Zhiqiang Han Yonglin Zhao Junxing et al. Depositional system and paleographic evolution of the middle Jurassic Yan an stage in the central and southern Ordos Basin J. Acta Geoscientia Sinica Wang Duoyun Liu Junfeng et al. The analysis on favorable conditions for reservoir formation by paleogeomorphology before J deposition Wu Liyan Chen Chunqian Jiang Chunming. Paleogeomorphic restoring techniques in China hydrocarbon exploration J. Journal of Oil and Gas Technology J Guo Shaobin Sun Shaohan. Rebuilding paleogeomorphology of Pre- Jurassic and oil-gas accumulation regulation in Zhoujiawan area J J earlier Jurassic Petroleum Suijing oilfield J. Natural Gas Geoscience J Zhao Min Taking lower Jurassic in Ziwuling area Ordos Basin as an example J. Natural Gas Geoscience J J Zhao Junxing Chen Hongde Xiang Fang. The high-resolution Zhao Junxing Chen Hongde Xiang Fang. The possibility of rebuilding paleogeomorphology before basin deposition by high- Ordos basin J. Acta Sedimentologica Sinica sequence stratigraphy feature of Yan an Formation in Yan an area resolution sequence stratigraphy J. Journal of Chengdu University of 312 Technology Genetic Type of Oil-gas Accumulation Paleogeomorphology and Favorable Conditions for Petroleum Accumulation Taking the paleogeomorphology of Pre-Jurassic in Shangliyuan area Ordos Basin as an example LI Shu-tong 1 ZHANG Hai-feng 2 4 WANG Duo-yun 3 TAO Hui-fei 1 5 CHU Mei-juan 4 CHEN Dan-dan Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou National Engineering Laboratory for Exploration and Development of Low - Permeability Oil & Gas Fields Xi'an College of Resources Science & Technology Beijing Normal University Beijing Exploration and Development Institute of Changqing Oilfield Company CNPC Xi'an Graduate School Chinese Academy of Sciences Beijing Abstract Nowadays we have a common consideration that the Pre-Jurassic palaeogeomorphology is the important basis which control the Yan9-Yan10's reservoirs of the lower part of the Yan'an Group. Before the lower quality of seismic data and less wells' data we recovered the palaeogeomorphology from the aspects of terrain's height slopes

8 5 969 and valleys however when the reservoirs were on the development stage the aforementioned palaeogeomorphic characterization was too macro especially it was too simple and coarse for the palaeogeomorphic positive landscape which resulted in a difficulty to master the distribution law of the Pre-Jurassic reservoirs and restricted the Jurassic reservoirs' exploration and development thus it was urgently to have a fine palaeogeomorphic characterization for the Pre-Jurassic. Under the conditions of the increasing exploration data and higher quality data the requirements of finely characterization the Pre-Jurassic palaeogeomorphology has achieved. According to the formation marks of the Yan8 Yan9 Yan10 of the lower Jurassic and Fuxian group in Shangliyuan area eastern Gansu Province recognized and correlated the lower Jurassic and Fuxian Formations based on the characteristics of the later Triassic structure movement and early Jurassic deposition environment we used the stratum thickness impression method Yan9 add Yan10 and add Fuxian formations' thickness to rebuild the pre-jurassic palaeogeomorphology of Shangliyuan area eastern Gansu Province. There were six landscape types valleys slopes highlands remnant ridges and remnant earthen mounds of the palaeogeomorphology the specific configuration was the first degree Gan-Shan ancient river distributed from west to east and the second Western Qing ancient river laid in south of the study area and flowed northwards into Gan- Shan ancient river the Jiyuan and Yanwu high lands respectively located in the north and south of the study area the Jiyuan south slope and Yanwu north slope developed in the transitional zone between the high lands and the valley furthermore there were inter-river mounds in the center of the first degree ancient valley and there were second landforms of remnant mounds and ridges in the slope. On the above basis we put for ward an oil accumulation palaeogeomorphology conceptions that was the palaeogeomorphology could control and organically combine the reservoirs' accumulation elements and made it form an organic reservoirs' deployment conditions eventually had a crucial affection on reservoirs' accumulation. The results showed that three types' reservoirs " remnant ridges remnant earthen mounds and inter-river mounds" occupied 80% in all the Lower Jurassic reservoirs in Shangliyuan area eastern Gansu Province associated with the distribution characteristic and formed law of the Lower Jurassic reservoirs we considered the remnant ridges remnant earthen mounds and inter-river mounds were the main oil accumulation ancient landscapes. On the principle of " the present is the key to the past" we studied the characteristics of modern erosion landscapes and analyzed their genetic models then divided the three main oil accumulation landscapes to three genetic models river robber river transformation and watershed erosion. The oil accumulation ancient landscapes made the reservoirs' formed models were led by structure and controlled by lithology and the advantageous reservoirs' formed conditions of the oil accumulation ancient landscapes to the Lower Jurassic reservoirs was 1 differential compaction small amplitude anticline and cove structure came from rigid oil accumulation palaeogeomorphology with its upper Yan an group soft stratum 2 the oil accumulation palaeogeomorphology easily to form river sandstone division and drape sandstone capes then formed isolated lens reservoir sandstone. We applied the oil accumulation palaeogeomorphology conceptions to divide the oil accumulation palaeogeomorphology types of the Pre-Jurassic in Shangliyuan area eastern Gansu Province and discussed the their geneses and analyzed the favorable reservoirs' formed conditions the purpose was to suggest a theory foundation and technical support on the exploration and development for the Lower Jurassic reservoirs in Ordos basin meanwhile provided studying ideas and methods for palaeogeomorphology reservoirs and enrichment and supplement to the research theory of these reservoirs' types. Key words impression method Lower Jurassic oil-gas accumulation paleogeomorphology reservoir formation condition Shangliyuan area

KJWJ01 Fig. 1 Geological map of the Kajiwa landslide PDH01 60 ~ 70m 80 ~ 90m 80m 2 930m 556m 641m 598m m m 3 2 Ⅰ m 2

KJWJ01 Fig. 1 Geological map of the Kajiwa landslide PDH01 60 ~ 70m 80 ~ 90m 80m 2 930m 556m 641m 598m m m 3 2 Ⅰ m 2 Vol. 39 No. 1 Jan. 2012 HYDROGEOLOGY & ENGINEERING GEOLOGY 39 1 2012 1-621701 - - P642. 2 A 1000-3665 2012 01-0058-07 2 ~ 4 2 r 3 3 1 col + dl 500 ~ 1 050m Q 4 2 Q del 4 3 8 ~ 50 ~ 60m 10 r 4 1 2 1 2 2.