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- Title
Soft-sediment Deformation Structures and Sand Body Architecture in the Chang 6 Oil Member of the Upper Triassic Yanchang Formation, Southwestern Ordos Basin, China.
- Authors
Qingshao Liang; Jingchun Tian; Feng Wang; Xiang Zhang
- Abstract
Soft-sediment deformation (SSD) structures of the Upper Triassic Yanchang Formation are laterally widespread in the Ordos Basin. In the Huachi-Qingyang (H-Q) area of the Ordos Basin, the Chang 6 oil member of the Upper Triassic Yanchang Formation is among the most significant Mesozoic oil-bearing strata. It is characterized by the development of reservoir sand bodies. During the depositional evolution of the Chang 6 oil member, SSD structures induced by paleo-seismic events developed in the H-Q area in the middle of the basin. The SSD structures developed in the sand bodies of the Chang 6 oil member are mainly ball-and-pillow structures, fold structures, sand dikes, irregular convolute stratifications, and synsedimentary faults. The architecture of the sand bodies resulted from paleo-seismic events and gravity slumping and mainly include two types of structures: i) SSD structures driven by paleo-seismic events with delta front sand body (SD-SSD) and ii) SSD structures driven by paleo-seismic events with turbidites (formed by delta-front slumping and re-distribution due to seismic action) (ST-SSD). As a consequence, genetic models of the sand bodies formed by different sedimentation processes are established.
- Subjects
CHINA; SAND; PETROLEUM; GENETIC models; SEDIMENTATION &; deposition
- Publication
Earth Sciences Research Journal, 2019, Vol 23, Issue 2, p119
- ISSN
1794-6190
- Publication type
Article
- DOI
10.15446/esrj.v23n2.72414