惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件

doi:10.11743/ogg20140316

Abstract

Abstract:

Sedimentary characteristics,distribution patterns and forming conditions of beach-bar sandbodies in the upper fourth member of the Eocene Shahejie Formation on the south slope of the Huimin sag have been systematically analyzed in this paper based on detailed core description and analyses of grain sizes,well log,seismic and the regional geological background data.The result indicates that the beach-bar sandstones are dominated by siltstones and fine-grained silty sandstones of high mud content,thus have unfavorable physical properties.Vertically,the beach-bar sandbodies are common in the first sand group but sporadic in the second,the third and the fourth sand groups.Laterally,beach-bars in the studying area distribute along the Xiakou fault.Stable water depth and stronger waves were beneficial to the formation of beach-bar sandbodies.The slope break caused by the Xiakou fault was helpful for beach-bar sandbodies to be formed along the thrown side of the fault but also restricted the horizontal spreading of the beach-bar.Sediments from the basement and earlier deposited layers in flood-overflow lake provided better sediment source for the beach-bar to develop than that from the terminal fan during floo-ding period.

Key words: beach-bar,sedimentary characteristics of sandbodies, upper Es⁴ Formation, south slope of the Huimin Sag

CLC Number:

TE121.3

Yuan Jing, Liang Huiyuan, Tan Mingyou, Chen Xiaojie, Dong Daotao, Sun Mingjiang, Gao Ruohan. Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag[J]. Oil & Gas Geology, 2014, 35(3): 410-416.

References

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Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag

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