| PETROGRAPHY, SEDIMENTARY ENVIRONMENT, SEQUENCE STRATIGRAPHY OF CHANG 6 MEMBER, JINGAN OILFIELD |
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| 基金项目： | This work is a part of results from a project funded by the Exploration Bureau of the Changqing Qilfield，supported by the Foundation of Laboratory of Lithosphere Tectonic Evolution Institute of Geology，Geophysics Chinese Academy of Sciences. |
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| 摘 要： | 1. Introduction The Ordos basin is a remnant inland basin on the western margin of the North China Plate and underwent several tectonic movements during its formation. There developed several assemblages of oil formation-reservoir-cover since Paleozoic. Of these, the Yanchang Formation (Upper Triassic) has important oil and gas reservoirs, especially in the Jingan Oilfield. Regional geology shows that, during the deposition of the Yanchang Formation (Upper Triassic), a huge inland lake …
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