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| STUDY ON THE SEDIMENTARY CHARACTERISTICS OF THE OIL-BEARING LAYERS C-8 AND C-9 OF YANCHANG FORMATION IN PINGBEI AREA, ORDOS BASIN |
| DONG Li-hong, LI Xin-wei, DU Yan-jun, SHI Xiao-zhang, MA Lang |
| Shaanxi Yanchang Petroleum(Group) Institute, Xi'an 710065, China |
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Abstract Good oil and gas shows are discovered in the exploration of oil-bearing layers C-8 and C-9 in Yanchang Formation, Pingbei area. Combining the data of well logging, geological logging, drill core and chemical analysis, a comprehensive study is conducted on the petrological, paleontological and geophysical characteristics of C-8 and C-9. The results show that the lacustrine-delta depositional systems, mainly delta front facies and shore-shallow lacustrine or prodelta sedimentary facies, are developed in the Pingbei area during the sedimentary period of C-8 and C-9, which can be subdivided into underwater distributary channel, underwater distributary interchannel, distant sandbar, shore-shallow lacustrine mudstone and prodelta mudstone microfacies. Among the facies above, the sand body of underwater distributary channel is relatively developed, serving as the main oil-gas accumulation place.
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Received: 15 March 2017
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2017, Vol. 26 
