E3S Web Conf.
Volume 338, 20227th International Conference on Environmental Science and Material Application (ESMA 2021)
|Number of page(s)||5|
|Published online||20 January 2022|
Study on Sedimentary Characteristics of Chang 9 Member of Triassic in Ordos Basin
No.5 Oil Production Plant of Changqing Oilfield Branch of Petrochina, Xi’an, China
* Corresponding author: email@example.com
The Triassic Yanchang Formation in the Ordos Basin is one of the main exploration targets. Based on the detailed exploration of the outcrop at the southern margin of the Ordos Basin, combined with previous results, a systematic analysis of lithology, rock assemblage, sedimentary facies characteristics and temporal evolution is carried out. The results show that the Changchang 9 oil-bearing group on the southern margin of the Ordos Basin can be divided into 9 lithofacies types, and three types of sedimentary facies, meandering river, meandering river delta, and braided river delta are developed. The meandering river facies develops riverbed retention deposits, beaches, and There are four types of microfacies in natural dikes and rupture fans. There are five types of microfacies in meandering river deltas: underwater distributary channels, underwater natural dikes, divert bays, estuary dams, and remote sand dams. Braided river deltas develop underwater distributary channels, There are two kinds of microfacies between distributary channels; the Chang 9 oil-bearing group has a coarse-fine-coarse compound rhythm in the vertical direction; meandering river sand bodies and delta front sand bodies are the main places for oil and gas migration and accumulation.
© The Authors, published by EDP Sciences, 2022
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