缅甸若开盆地上中新统-上新统深水沉积层序地层划分及控制因素

doi:10.11743/ogg20150117

Abstract

Abstract:

High resolution 3D seismic data were used for the sequence stratigraphy division of the Upper Miocene-Pliocene deepwater gravity flow deposits in Rakhine Basin, Myanmar.Taking the continuous weak reflections of the TST-HST mudstones and the base of the thick channel incision and lobe sandstones as the third-order sequence boundaries, the upper Miocene-seabed deposits were divided into three third-order sequences, corresponding to the Upper Miocene, Pliocene and Pleistocene-seabed respectively.The Upper Miocene and Pliocene were selected as the focus of this study and were subdivided into three and two fourth-order sequences respectively according to the vertical evolution characteristics of the deepwater architectural elements.Each fourth-order sequence shows similar positive rhythm features of upward decreasing grain size, weakening denudation and lowering sand-to-gross ratio.The third-order sequence boundaries were caused by the regional large marine regressions, while the fourth-order sequence boundaries were resulted from the small-scale marine regressions.The development of sequence stratigraphies was mainly controlled by the sea level change, tectonic uplifting and climate.The sea level change influenced the deposition variation.And the tectonic uplifting and the climate controlled the sediment supply volume which affected the stacking styles of the fourth-order sequence.Especially during 7-8 Ma, the rapid uplifting of the Tibetan strengthened the south Asian monsoon, intensified erosion, and thus increased sediment supply.Consequently, the lobe sandstones increased and the channel incision strengthened during 7-8 Ma.

Key words: sequence stratigraphy, deepwater deposition, Upper Miocene-Pliocene, Rakhine Basin, Mganmar

CLC Number:

TE121.3

Ma Hongxia, Sun hui, Shao Dali, Liu Yanhong, Ding Liangbo, Zou Chen, Yu Xinpei. Sequence stratigraphy of the Upper Miocene-Pliocene deepwater deposits and its controlling factors in Rakhine Basin, Myanmar[J]. Oil & Gas Geology, 2015, 36(1): 136-141.

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Sequence stratigraphy of the Upper Miocene-Pliocene deepwater deposits and its controlling factors in Rakhine Basin, Myanmar

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