Sedimentary Model and Its Architectural Characteristics of Delta under the Control of Fault-Rupture-Sag Coupling in Wushi Sag

doi:10.3969/j.issn.1006-6535.2022.02.005

Abstract

Abstract: In view of the problems of complex fault structure and unclear understanding of flagstone distribution and connectivity of the reservoirs in Member 2, Liushagang Formation, Wushi Oilfield Cluster, the deposition patterns and architecture characteristics of delta in Wushi Sag were more understood on basis of comprehensive interpretation and application of core, well logging and seismic data. It was found in the study that the sedimentary development in the study area was affected by multiple factors such as base level change, fault development, and paleo-geomorphology, and mainly develops the delta sediment was mainly formed by fault-rupture-sag coupling under the control of base level; constrained by the sedimentary model, the characteristics of typical sedimentary microfacies were identified, and it was determined that the base level has experienced the lacustrine-delta front-delta shrinking sediment in the process of first falling and then rising; it was clarified that the delta sand body in Member 2 of Liushagang Formation was characterized by the lateral superposition of multiple underwater distributary channels, with such superposition styles as lateral, docking and isolated superposition; finally an architecture model suitable for the study area was established, and the influence of various environmental factors on sandbody distribution was determined. The results can effectively guide the analysis of sandbody connectivity. The results of the study lay a foundation for the efficient development of Wushi Oilfield Cluster, and can be used as a reference for the study of sedimentary models and internal structures of similar complex block-faulted oil and gas fields.

Key words: base level, fault slope, paleo-geomorphology, delta, sedimentary model, configuration, Wushi Sag

CLC Number:

TE122.1

Wang Yu, Zhang Hui, Yang Chaoqiang, Qi Zhi, Ma Huashuai, Wang Meng, Chen Jian. Sedimentary Model and Its Architectural Characteristics of Delta under the Control of Fault-Rupture-Sag Coupling in Wushi Sag[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 34-41.

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