缅甸若开海域块体搬运沉积地震响应及典型地质特征

doi:10.11743/ogg20110514

Abstract

Abstract:

Mass-transport deposits(MTD)are an important component of deepwater deposition system.They occur in many deepwater basins around the word and play an important role in petroleum exploration and production.Using deepwater 3D seismic data,we predicted mass-transport deposits in the lower of the Upper Pliocene in Rakhine Sub-Basin,offshore Myanmar.Based on the seismic sections and time slices,we recognized 3 seismic facies in the MTD:low amplitude,semitransparent and chaotic seismic reflections,imbricate variable amplitude reflections and moderate-high amplitude reflections.The first seismic facies is the typical seismic response of laminar flow in the middle MTD,the second seismic facies is the evidence of the syndepositional deformation at the toe of MTD,and the third seismic facies is the seismic response of the floating blocks in the MTD.Based on RMS,coherence slices and structure maps,we analyzed the typical geologic features on the top boundary,bottom boundary and in the interior of MTD.The bottom boundary is mainly characterized by erosion,and the top boundary reveals the laminar flow and plastic flow regimes of MTD,while the interior mainly features in deformation and compression.

Key words: seismic facies, geological characteristics, mass-transport deposit, deepwater deposition system, Rakhine Sub-basin, Myanmar

CLC Number:

TE121.3

Ma Hongxia, Lü Fuliang, Fan Guozhang, Sun Hui, Gao Cuixin. Seismic responses and geological characteristics of mass-transport deposits in the Rakhine Basin,Offshore Myanmar[J]. Oil & Gas Geology, 2011, 32(5): 751-759.

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Seismic responses and geological characteristics of mass-transport deposits in the Rakhine Basin,Offshore Myanmar

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