Study on Identification of Short-Term Base-Level Cycle and Macroscopic Distribution of Reservoirsin Shallow-Water Braided Delta

WANGJia hao; YAO Guang qing; ZHAO Yan chao

In this paper, the author integratesthe controllingfactors of sequence with sedimentary response. It takes a short term base level cycleas a geneticstratigraphic unit to discuss the different accommodationspace development, the change of fluvial process, macroscopic distribution of reservoirs, the influence of sediment supply in a down warped basin or a rift basin where shallow water braided delta develops. Taking the Tabamiao Area of Ordos Basin and the Baobei Block, Baolang Oil field of Yanqi Basin as examples, It points out some identification symbols such as the wash plane and incised valley at the bottom of thick overlap sand-body, the meandering of braided distributary channel, the sedimentaries of offshore barrier faciesand offshore marsh facies. It provides the theoretical evidence for stable and thick coal bed regarded as a mark of formation comparison. The conception, overplus subaerial accommodationspace, explains reasonablywhy the reservoirs mainly distributein rise half cycle of base levelcycle.

China University of Geosciences, Wuhan 430074

Received Date: 2003-03-28

Rev Recd Date: 2003-06-09

Publish Date: 2004-03-10

Key words:

Abstract: In this paper, the author integratesthe controllingfactors of sequence with sedimentary response. It takes a short term base level cycleas a geneticstratigraphic unit to discuss the different accommodationspace development, the change of fluvial process, macroscopic distribution of reservoirs, the influence of sediment supply in a down warped basin or a rift basin where shallow water braided delta develops. Taking the Tabamiao Area of Ordos Basin and the Baobei Block, Baolang Oil field of Yanqi Basin as examples, It points out some identification symbols such as the wash plane and incised valley at the bottom of thick overlap sand-body, the meandering of braided distributary channel, the sedimentaries of offshore barrier faciesand offshore marsh facies. It provides the theoretical evidence for stable and thick coal bed regarded as a mark of formation comparison. The conception, overplus subaerial accommodationspace, explains reasonablywhy the reservoirs mainly distributein rise half cycle of base levelcycle.

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Reference (13)

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Study on Identification of Short-Term Base-Level Cycle and Macroscopic Distribution of Reservoirsin Shallow-Water Braided Delta

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