下刚果盆地A区块中新统深水沉积体系特征

doi:10.11743/ogg20150611

Abstract

Abstract: Sedimentary types in the Miocene of Lower Congo Basin is of dominantly deep water gravity flow.Analyses of drilling and logging data combined with study of high-resolution 3D seismic attributes reveal characteristics of the deep water sedimentary system and sequence of southwestern lower Congo Basin.About 7 third-order sequences can be recognized from the Miocene of Block A:massive transportation,water channels,levees,lobes,abandoned water channels,flood fans and deep sea mud under their respective sequence frameworks.Features and scales of gravity flow under these frameworks vary greatly:small-scale highly-bent gravity flow channels and levees were developed in the less intensive sedimentation of SQ1-SQ2 and SQ4-SQ5 and massive complex gravity flow channels,lobes and levees were developed during the large-scale deposition of SQ3 and SQ6-SQ7.An integrated development characterization of the units was performed to establish the sedimentary model in the area:the massive transportation occurring near continental slope,water channel-levee complexes and flood fans near provenance,and abundant water channels in highly-bent area and lobes at the end of water channels.The modal may provide guidance for further deep oil and gas exploration in the area.

Key words: gravity flow, deep water sedimentary system, stratigraphic sequence, Miocene, Lower Congo Basin

CLC Number:

TE121.3

Wang Linlin, Wang Zhenqi, Xiao Peng. Characterization of deep water sedimentary system in the Miocene of Block A in Lower Congo Basin[J]. Oil & Gas Geology, 2015, 36(6): 963-974.

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Characterization of deep water sedimentary system in the Miocene of Block A in Lower Congo Basin

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