Based on the data associated with cores,sidewall cores,casting thin sections,reservoir physical properties,conventional logging and imaging logging,the classification schemes of vertical reservoir units are proposed f...Based on the data associated with cores,sidewall cores,casting thin sections,reservoir physical properties,conventional logging and imaging logging,the classification schemes of vertical reservoir units are proposed for the two types of Archaeozoic buried hills(exposed and covered ones)in the Bozhong Sag,Bohai Bay Basin.The geological characteristics and storage spaces of these reservoir units are described,and their identification markers in conventional and imaging log curves are established.The Archaeozoic metamorphic buried hills can be vertically classified into two primary reservoir units:weathering crust and inner buried hill.The weathering crust contains four secondary units,i.e.,the clay zone,weathered glutenite zone,leached zone,disaggregation zone;and the interiors contain two secondary units,i.e.,interior fracture zone and tight zone.In particular,the inner fracture zone was further divided into cataclasite belts and dense-fracture belts.It is proposed that the favorable reservoirs of exposed Archaeozoic metamorphic buried hills are mainly developed in four parts including weathered glutenite zone,leached zone,disintegration zone superposed with the cataclasite belt and the cataclasite belt of inner fracture zone,and are controlled by both weathering and tectonic actions.Favorable reservoirs in covered Archaeozoic metamorphic buried hills are mainly developed in the weathering crust superposed with the cataclasite belts and the cataclasite belts of inner fracture zone,and are mainly controlled by tectonic actions.展开更多
From south to north, the eastern part of Tianshan Mountains situated between the Tarim and Junggar basins can be divided into the Middle Proterozoic orogenic zone, the Caledonian orogenic zone and the Hercynian orogen...From south to north, the eastern part of Tianshan Mountains situated between the Tarim and Junggar basins can be divided into the Middle Proterozoic orogenic zone, the Caledonian orogenic zone and the Hercynian orogenic zone successively. Detailed studies show that the Caledonian orogenic zone is an accretionary one at continental margin which evolved from the Andean-type to the Pacific-type active continental margin in the northern fringe of the Tarim plate during the Caledonian cycle and was finally formed following展开更多
The Dahu quartz vein-style Au-Mo deposit is an important deposit in the Xiaoqingling region,which contains a total reserves of 38 tons of Au at an average grade of 6.8 g/t and 100,000 tons of Mo at an average grade of...The Dahu quartz vein-style Au-Mo deposit is an important deposit in the Xiaoqingling region,which contains a total reserves of 38 tons of Au at an average grade of 6.8 g/t and 100,000 tons of Mo at an average grade of 0.24%.It is hosted in the highly metamorphic gneiss of the Archaeozoic Taihua group,and the ore-bearing quartz veins are controlled by several small to medium size E–W-striking faults,i.e.,F1,F8,F7,F35,F5,and F6 from north to south(Jian et al.,2015).展开更多
基金Supported by the National Natural Science Foundation of China(41790453,41972313).
文摘Based on the data associated with cores,sidewall cores,casting thin sections,reservoir physical properties,conventional logging and imaging logging,the classification schemes of vertical reservoir units are proposed for the two types of Archaeozoic buried hills(exposed and covered ones)in the Bozhong Sag,Bohai Bay Basin.The geological characteristics and storage spaces of these reservoir units are described,and their identification markers in conventional and imaging log curves are established.The Archaeozoic metamorphic buried hills can be vertically classified into two primary reservoir units:weathering crust and inner buried hill.The weathering crust contains four secondary units,i.e.,the clay zone,weathered glutenite zone,leached zone,disaggregation zone;and the interiors contain two secondary units,i.e.,interior fracture zone and tight zone.In particular,the inner fracture zone was further divided into cataclasite belts and dense-fracture belts.It is proposed that the favorable reservoirs of exposed Archaeozoic metamorphic buried hills are mainly developed in four parts including weathered glutenite zone,leached zone,disintegration zone superposed with the cataclasite belt and the cataclasite belt of inner fracture zone,and are controlled by both weathering and tectonic actions.Favorable reservoirs in covered Archaeozoic metamorphic buried hills are mainly developed in the weathering crust superposed with the cataclasite belts and the cataclasite belts of inner fracture zone,and are mainly controlled by tectonic actions.
文摘From south to north, the eastern part of Tianshan Mountains situated between the Tarim and Junggar basins can be divided into the Middle Proterozoic orogenic zone, the Caledonian orogenic zone and the Hercynian orogenic zone successively. Detailed studies show that the Caledonian orogenic zone is an accretionary one at continental margin which evolved from the Andean-type to the Pacific-type active continental margin in the northern fringe of the Tarim plate during the Caledonian cycle and was finally formed following
基金supported by the National Natural Science Foundation of China(grants No.41573036 and 41730426)Fundamental Research Funds for the Central Universities,China University of Geosciences(grant No.2652017263)
文摘The Dahu quartz vein-style Au-Mo deposit is an important deposit in the Xiaoqingling region,which contains a total reserves of 38 tons of Au at an average grade of 6.8 g/t and 100,000 tons of Mo at an average grade of 0.24%.It is hosted in the highly metamorphic gneiss of the Archaeozoic Taihua group,and the ore-bearing quartz veins are controlled by several small to medium size E–W-striking faults,i.e.,F1,F8,F7,F35,F5,and F6 from north to south(Jian et al.,2015).
