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2012, 31(1) 28-39 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Characteristics and significance of sedimentary microfacies in Yingcheng Formation of Lishu faulted depression in Songliao Basin |
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YANG Xin-Yu-1, CHENG Ri-Hui-1, HUANG Dang-Wei-2 |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Exploration and Development Institute of the Northeast Oil and Gas Branch��SinoPEC��Changchun 130062��China |
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Abstract��
Yingcheng Formation Lishu faulted depression in Songliao Basin is a set of detrital rocks��in which the main lithological characters are normal detrital of with inferior pyroclastic sedimentary in rocks�� The sandstone is the highest in proportion��including feldspar-debris and debris-feldspar sandstone�� The composition characteristics of the sandstone are as the same as acidic volcanics��indicating the acid volcanic rocks in source characteristics�� The Yingcheng Formation can be divided into four sand groups and two big cycles by filling sequence: �� Y2 and Y1��and �� Y4 and Y3�� The ends of Y2 and Y4 are showing the maximum flooding surfaces of the two cycles�� Fourteen sedimentary microfacies were identified��including mudstone of still water��turbidity sediment��nearshore bar��turbidity channel��debris flow��braided channel��laminar flow sediment��interdistributary bay��mouth bar�� gravity mouth bar��underwater channel��gravity underwater channel��distal-bar and sheet sand�� Among them��the gravity mouth bar and gravity underwater channel of fan delta��and turbidity channel of subaqueous fan��were developed well and the products of deposition and re-transportation in active setting�� The three kinds of sand bodies arealso important oil reservoirs in the Shiwu oilfield�� |
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Keywords��
Songliao Basin
Lishu faulted depression
Yingcheng Formation
rock type
lithological sequence
sedimentary microfacie
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Received Revised Online: |
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