河流相地层相分异与沉积物体积分配规律

doi:10.11743/ogg20050315

Abstract

Abstract:

Elevation and subsidence of base level,accompanying change of accommodation space,leading to denudation,transportation,passing by,sedimentation or undercompensation of sediments in various facies tracts,would result in cyclic sequences.The phenomena of synchronic formations having different thicknesses seen in isochronal correlation of terrestrial formations are the stratigraphic responses to facies differentiation and sedimentation volume partition.In the direction parallel with sources,lithofacies types might change from braided channel facies sequence to meandering stream and delta facies sequences;while in the direction perpendicular to the sources,the fluvial facies might change from channel fill to interchannel washover and flood plain deposits,or the delta facies might change from distributary channel deposit to inter-distributary bay deposit.Facies differentiation accompanied by sedimentation volume partition would result in different volume partitions of synchronous deposit in different facies traets.Palaeogeomorphology might have controlled the distribution of fluvial facies reservoirs.Transportation of palaeocurrent might lead to the deposition of channel sandbodies on the sequence boundary where valleys have been developed in the palaeogeomorphologic low-land with relatively large accommodation space.

Key words: sequence stratigraphy, stratigraphic conelation, facies differentiation, sedimentation volume partition, paleochannel sandbody forcast

CLC Number:

TE111.3

Li Hongwei, Yuan Shiyi, Zhu Yixiang, Tian Changbing, Fan Junxia, Yan Lin. Facies differentiation and sedimentation volume partition of fluvial strata[J]. Oil & Gas Geology, 2005, 26(3): 356-360.

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Facies differentiation and sedimentation volume partition of fluvial strata

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