STUDY ON THE SEDIMENTARY CHARACTERISTICS OF THE OIL-BEARING LAYERS C-8 AND C-9 OF YANCHANG FORMATION IN PINGBEI AREA, ORDOS BASIN
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摘要: 在对坪北地区深层延长组长8、长9油层组的油气勘探中，发现了较好的含油显示.综合测井、录井、岩心及其分析化验资料等，对坪北地区延长组长8、长9油层组岩石学、古生物学及地球物理特征进行综合研究，结果表明：长8、长9油层组沉积时期坪北地区发育湖泊-三角洲沉积体系，主要发育三角洲前缘沉积以及滨浅湖或前三角洲沉积；进一步可划分为水下分流河道微相、水下分流河道间微相、远砂坝微相、滨浅湖泥岩及前三角洲泥岩，其中水下分流河道砂体比较发育，是油气聚集的主要场所.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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Key words:
- Ordos Basin /
- Pingbei area /
- Yanchang Formation /
- underwater distributary channel /
- tight sandstone
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