Development and Evolution of Deep-sea Channels in Salt Diapir Typed Microbasins

doi:10.11885/j.issn.1674-5086.2024.08.28.05

Abstract

Abstract: The unclear development and evolution characteristics of deep-sea channels in salt diapir typed microbasins hinders the exploration and development of deep-sea oil and gas and increases the difficulty of deep-sea oil and gas exploration and development. To solve such problems we made a case study on a Miocene salt diapir typed microbasin in the deep-water area of the continental margin of Angola, based on 3D seismic data and using RGB color blending technique, and analyzed the development and evolution characteristics and evolution model of channels in the basin. The study shows that the structural development of the microbasin controls the development and evolution of the deep-water channel. The channels C1, C2 and C3 developed along the short axis of the microbasin mainly develop the model of overflowing the microbasin, while channels C4 and C5 developed along the long axis of the basin mainly developed the model of filling microbasins. Whether the channel fills or overflows in the microbasin is mainly related to the relationship between the active period of the salt structure and the formation and evolution of the channel, the relative magnitude of the erosion ability of the gravity flow in the channel to the active rate of the salt structure, the structural development characteristics of the microbasin and the angle between channel flow direction and tectonic trend. The channels C4 and C5 flow along the bottom of the structure under the action of gravity flow. With the increase of the accommodation space, the end of the channel gradually begins to lobe and form leaf deposits.

Key words: salt diapir typed microbasin, deep-sea channel, development and evolution, filling and overflow mode, channel leafing

CLC Number:

TE121
P512.2

MU Boyu, ZHAO Xiaoming, QI Kun, LIU Fei, LI Fayou. Development and Evolution of Deep-sea Channels in Salt Diapir Typed Microbasins[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(1): 95-106.

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