Sedimentary characteristics of tide-dominated estuary in Donghetang Formation(Upper Devonian), central Tarim Basin |
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作者姓名: | WANG Li-ping LI Chuang TANG Bing-yong |
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作者单位: | [1]Donghua University, Shanghai 200051, China [2]Shanghai Jiaotong University, Shanghai 200030, China |
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摘 要: | The Donghetang Formation (Upper Devonian) in central Tarim Basin has been thought an important oil and gas reservoir since the abundant oil and gas resources were found in the wells W16, W20, W34, and other fields. However, the sedimentary environment of the Donghetang Formation has been disputed because it suffered from both tidal and fluvial actions and there were not rich fossils in the sandstone. After the authors analyzed sedimentary features by means of drill cores, well logging data, paleosols, and with SEM obseruations, three kinds of sedimentary environments were distinguished: alluvial fan, tide-dominated estuary, and shelf. Particularly, the sedimentary features of tide-dominated estuary were studied in detail. Besides, the authors discussed sedimentary characteristics of the Donghetang Formation which was divided into two fourth-order sequences and five system tracts. At the same time, according to the forming process of five system tracts, the whole vertical evolution and lateral transition of tide-dominated estuary were illustrated clearly. Finally, the reservoir quality was evaluated based on porosity and permeability.
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关 键 词: | 塔里木盆地 河口湾 地层学 储集层 沉积作用 |
文章编号: | 1008-0503(2005)01/02-0078-16 |
收稿时间: | 2005-09-02 |
修稿时间: | 2005-10-20 |
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