| 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 Donghua University Shanghai China Shanghai Jiaolong University Shanghai China |
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| 作者单位： | WANG Li-ping，LI Chuang，TANG Bing-yong Donghua University，Shanghai 200051，China Shanghai Jiaolong 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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Sedimentary characteristics of tide-dominated estuary in Donghetang Formation (Upper Devonian), central Tarim Basin |
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| WANG Li-ping,LI Chuang,TANG Bing-yong Donghua University,Shanghai ,China Shanghai Jiaolong University,Shanghai ,China.Sedimentary characteristics of tide-dominated estuary in Donghetang Formation (Upper Devonian), central Tarim Basin[J].Journal of Geoscientific Research in Northeast Asia,2005(Z1). |
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| Authors: | WANG Li-ping LI Chuang TANG Bing-yong Donghua University Shanghai China Shanghai Jiaolong University Shanghai China |
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| Institution: | WANG Li-ping,LI Chuang,TANG Bing-yong Donghua University,Shanghai 200051,China Shanghai Jiaolong University,Shanghai 200030,China |
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| Abstract: | 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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| Keywords: | Tarim Basin Donghetang Formation tide-dominated estuary sequence stratigraphy reservoir evaluation |
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