异重流发育条件、演化过程及沉积特征

doi:10.11743/ogg20180303

Abstract

Abstract: Hyperpycnal flows are dense,formed when a sediment-laden fluid plunges into the bottom of a water body and flows basinward.After a large number of literature review,we summarized the development conditions,evolution process and depositional features of hyperpycnal flow.The formation of hyperpycnal flow is controlled by tectonic and climatic conditions,closely related to the location of the source-to-sink system.And the favorable conditions for its development are loose parent rocks,semi-arid climate,high elevation difference,low degree of evaporation of river drainage area,a significant slope at the river mouth and low-density water body.Typically,sedimentary sequence of hyperpycnites can reflect the evolution of hyperpycnal flow energy.To identify hyperpycnites,we should pay attention to important features such as coupling of inverse and normal grading (Ha-Hb),internal mutation/erosion contact,typical flowing depositional structures and concentration of plant debris.Based on previous workers'studies,we established an ideal model of hyperpycnal facies consisting of channel-filling sedimentation,channel margin sedimentation,natural levees and front lobes.

Key words: development condition, evolution process, depositional feature, depositional model, hyperpycnal flow

CLC Number:

TE121.3

Luan Guoqiang, Dong Chunmei, Lin Chengyan, Ren Lihua, Jiao Hongyan, Zhao Haiyan, Peng Xianguo. Development conditions, evolution process and depositional features of hyperpycnal flow[J]. Oil & Gas Geology, 2018, 39(3): 438-453.

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Development conditions, evolution process and depositional features of hyperpycnal flow

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