爱尔兰克莱尔盆地Ross Sandstone组深水浊积岩露头高分辨率层序地层学

doi:10.11743/ogg20170117

Abstract

Abstract:

Using the principles and methods of high-resolution sequence stratigraphy,the Ross Sandstone deepwaterturbidite lobe outcrops in the coast of western Irelandare studiedbased on four factors:laterally extensive mudstones,sedimentary structures and lithofacies associations,degree of sand amalgamation and sedimentary pattern and thickness.The high-resolution sequence stratigraphic framework has been established,the depositional model of deepwaterturbidite lobe is proposed,and the controlling factors for base level cycles at different hierarchies are discussed.The results show that,the organic-rich pelagic mudstone with abundant goniatites represents the transition of two adjacent long-term base level hemi-cycles.Within the long-term base level cycle,each mid-term base level cycle is bounded by the thin mudstones with subordinate siltstones which can extend laterally several kilometers to tens of kilometers.Each mid-term cycle is composed of several thickening-upward cycles which are 0.5-7 m thick and several hundred meters to several kilometers across,suggesting continuous lobe progradation.

Key words: base level cycle, thickening-upward cycle, depositional model, high resolution sequence stratigraphy, deepwater turbidite lobes, Clare Basin, Ireland

CLC Number:

TE121.3

Zhang Leifu, Wu Chenjun, Su Yang, Guo Yanjun, Wang Hongliang. High resolution sequence stratigraphy of the Ross Sandstone deepwater turbidite outcrops in the Clare Basin, Ireland[J]. Oil & Gas Geology, 2017, 38(1): 165-174.

References

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High resolution sequence stratigraphy of the Ross Sandstone deepwater turbidite outcrops in the Clare Basin, Ireland

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