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- Title
Influence of Reverse Fault Structural Slope Break Zones on Sedimentary Facies and Reservoir Development: Example of thick sandy conglomerate of the Badaowan Formation at western margin of Mahu Sag.
- Authors
WANG Hui; WANG ZhiQiang; LUO Gan; ZHOU WeiJun
- Abstract
The slope break zone at the western margin of the Mahu Sag controls the paleogeomorphology, sedimentary facies type and distribution, oil and gas reservoir distribution, etc., but to date there is a lack of research on the formation mechanism and evolution of the slope break zone. This restricts the process of oil and gas exploration in this area. Based on the analysis of core logging and seismic data, it is considered that the Badaowan Formation in this area comprises wet alluvial fan facies and braided river delta facies. The lower member of the formation is composed of alluvial fan and braided river delta plain subfacies, and a fan progradation structure is clearly seen in the seismic section. The upper member is a combination of braided river delta plains and fronts, mainly fronts. The sedimentation process in the Badaowan Formation was controlled by the slope break zone, which is related to the thrust fault derived from the thrust nappe. The analysis shows that the slope break zone formed by multiple reverse faults hindered the transport of sediments to the basin; the slope break zone formed by single faults has vanished completely due to weathering and erosion, and thus does not hinder the transport of sediments. The side of the slope break zone closest to the provenance is the highest part of the structure, and alluvial fans and braided river delta plains were often developed; the lowest part of the structure is below the slope break zone, and braided river delta fronts were often developed. The slope break zone thus influences the sedimentary facies, and also plays a role in controlling the physical properties of the reservoir. The reservoirs with the best physical properties are distributed towards the southeast side of the slope break zone, and readily form upward pinchout oil and gas reservoirs. The lower part of the slope break zone is therefore the focus of oil and gas exploration.
- Publication
Acta Sedimentologica Sinica, 2022, Vol 40, Issue 6, p1519
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000-0550.2022.072