|Table of Contents|

Reservoir Characteristics of Luohe Formation and Metallogenic Geological Conditions of Deep Uranium in the Southwestern Margin of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第06期
Page:
675-690
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Reservoir Characteristics of Luohe Formation and Metallogenic Geological Conditions of Deep Uranium in the Southwestern Margin of Ordos Basin, China
Author(s):
ZHU Qiang1; 2; 3;  LI Jian-guo1; 2; 3*;  MIAO Pei-sen1; 2; 3;  SI Qing-hong1; 2; 3;  ZHAO Hua-lei1; 2; 3;  XIAO Peng1; 2; 3;  ZHANG Bo1; 2; 3;  CHEN Yin1; 2; 3;  ZHAO Bo-wen1; 3
(1. Tianjin Center, China Geological Survey, Tianjin 300170, China; 2. Key Laboratory of Uranium Geology, China Geological Survey, Tianjin 300170, China; 3. North China Center for Geoscience Innovation, Tianjin 300170, China)
Keywords:
sandstone-type uranium;  Luohe Formation;  metallogenic geological condition;  deep reservoir;  occurrence state;  ore-controlling factor;  Ordos Basin
PACS:
P619.14
DOI:
-
Abstract:
Ordos Basin is an important exploration base for coal, oil and gas, uranium and other resources in China. Several large and medium-sized sandstone-type uranium deposits are discovered in the northeastern, western and southeastern margins, the prospecting breakthrough in southwestern margin is always difficult in uranium exploration. Through the comprehensive study on the characteristics of tectonic setting, stratigraphic structure, lithology and lithofacies, hydrogeology and paleoclimate in Zhenyuan area, the southwestern margin of Ordos Basin, it is concluded that the Lower Cretaceous Luohe Formation has the conditions for the formation of sandstone-type uranium deposit in study area, such as the tectonic setting is favorable for fluid migration since Early Cretaceous, the aeolian sandstones of Luohe Formation have stable thickness and good permeability, the structure is mud-sand-mud or mud-sand-calcium(calcareous sandstone)/mud, the U contents in source and caprock layers are high, the groundwater runoff system is connected, the climatic condition is arid-semiarid, the reduction media of oil and gas is abundant. By studying the types and occurrence states of uranium minerals, it is proposed that the main type is pitchblende, and a small part is titanium-containing uranium minerals. The occurrence states of uranium minerals are quite different from Zhiluo Formation in the northeastern margin of Ordos Basin, which are mainly associated with acicular apatite, feldspar, chlorite, illite/smectite formation, dolomite and pyrite, etc., but not directly associated with carbon debris and other reducing media. Among them, the discovery of the associated relationship between sandstone-type uranium deposits and apatite is particularly important. According to the analysis of metallogenic conditions, the rising position of oil and gas controlled by fault structure may be the favorable exploration direction for the next step.

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Last Update: 2019-11-19