Origin and depositional model of deep-water lacustrine sandstone deposits in the 7th and 6th members of the Yanchang Formation (Late Triassic), Binchang area, Ordos Basin, China
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- 作者：Xi-Xiang Liu ; Xiao-Qi Ding ; Shao-Nan Zhang ; Hao He
- 关键词：Sediment gravity flows ; Sandy debris flows ; Binchang area ; Yanchang Formation ; Ordos Basin
- 刊名：Petroleum Science
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：14
- 期：1
- 页码：24-36
- 全文大小：7300KB
- 刊物主题：Mineral Resources; Industrial Chemistry/Chemical Engineering; Industrial and Production Engineering; Energy Economics;
- 出版者：China University of Petroleum (Beijing)
- ISSN：1995-8226
- 卷排序：14
文摘
Sandstones attributed to different lacustrine sediment gravity flows are present in the 7th and 6th members of the Yanchang Formation in the Ordos Basin, China. These differences in their origins led to different sandstone distributions which control the scale and connectivity of oil and gas reservoirs. Numerous cores and outcrops were analysed to understand the origins of these sandstones. The main origin of these sandstones was analysed by statistical methods, and well logging data were used to study their vertical and horizontal distributions. Results show that the sandstones in the study area accumulated via sandy debris flows, turbidity currents and slumping, and sandy debris flows predominate. The sandstone associated with a single event is characteristically small in scale and exhibits poor lateral continuity. However, as a result of multiple events that stacked gravity flow-related sandstones atop one another, sandstones are extensive overall, as illustrated in the cross section and isopach maps. Finally, a depositional model was developed in which sandy debris flows predominated and various other types of small-scale gravity flows occurred frequently, resulting in extensive deposition of sand bodies across a large area.