Characteristics and Sedimentary Facies Model of Wandering Braided Rivers

doi:10.11885/j.issn.1674-5086.2022.01.13.04

Abstract

Abstract: Aiming at the problem of unclear knowledge and unclear patterns of sandy braided river in Guantao Formation of Block Gao 104-5 in Jidong Oilfield, a classification study of sandy braided rivers was carried out, using criteria including regional geological background, paleoclimate, rock grain size, bedding structure and facies sequence, levee and mud drapes, and sand body morphology. The study area is determined to be a wandering braided river. Then, the architectural element analysis method from Miall is adopted to anatomize the wandering braided river. The two types of identification marks of braided belt boundary and 3 types of identification marks of river channel and mid channel bar are constructed to anatomize the wandering braided channel. The result shows that the scale of the channel belts are about 1 400.00 m wide, the width and length of mid channel bar are about 158.86 m and 414.47 m, respectively; the width of channel is 53.18 m. and the length/width of mid channel is about 2~4; the average width of mid channel bar and channel is 2.2. So the study area is categorized as the wide bar and narrow channel pattern. Finally, using depositional simulation methods, a wandering braided river sedimentary facies model in the study area was established to guide oilfield development.

Key words: wandering braided river, braided river classification, reservoir architecture, sedimentary facies model, Block Gao 104-5

CLC Number:

TE122

WANG Haikao, WANG Miao, YU Zhongliang, YU Chenglin, YIN Yanshu. Characteristics and Sedimentary Facies Model of Wandering Braided Rivers[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(1): 35-52.

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