Global Geology-Forthcoming Articles Forthcoming Articles http://sjdz.jlu.edu.cn EN-US http://sjdz.jlu.edu.cn/EN/current.shtml http://sjdz.jlu.edu.cn 5 <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[Accumulation characteristics of tight sandstone gas in Huhehu depression of Hailaer Basin]]> 1n2 strata are widely developed,the abundance of organic matter is in medium-good level,which provides good material conditions for forming tight sandstone gas reservoir. The reservoirs in subsag of K1n2 strata is low in porosity and special low in permeability. The reservoir rocks of K1n2 strata are frequently interbedded with coal and mudstone,which is favorable for inter-source gas accumulation in the tight sandstone reservoir. Tectonic high part controls the oil and gas abundance in some degree,and the stable negative reservoir structural zone is conducive to looking for enrichment region. Tight sandstone gas reservoir is mainly in two combinations,including self-generated and self-storage type,and endogenous external storage type; and oil and gas are distributed in band in NS direction.]]> <![CDATA[Accumulation characteristics of tight sandstone gas in Huhehu depression of Hailaer Basin]]> <![CDATA[Re-division of lithostratigraphic units of previous Neoproterozoic Yintun Formation and its geological significance in northern Liaoning]]> <![CDATA[Characteristics of reservoir distribution based on time-frequency property and its application in a certain oilfield of Jilin]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[]]> <![CDATA[ Organic matter characteristics and influence on mineralization <div>of Erdaokan Ag??Pb??Zn deposit in Duobaoshanore?concentrated area, Northeast Great Xing??an Range</div>]]> tion and organic composition analyses of organic matter in ore and wall rocks. The results show that the ore bodies
of Erdaokan Ag ??Pb ??Zn deposit occur in the NW??trending tectonic fracture zone and are closely associated with the carbonaceous mudstone and limestone of the Upper Silurian??Middle Devonian Niqiuhe Formation. The ore is composed of structural breccia. The ore minerals mainly consist of magnetite, pyrite and galena, followed by sphalerite, tetrahedrite, hematite and siderite, etc. , and the Ag??bearing minerals are mainly argentite and pyrargyrite. A
large amount of bitumen associated with ore minerals appears in the ore. The carbonaceous mudstone and limestone of Niqiuhe Formation in the host rock are equally enriched with organic carbon content of 0?? 77% and 3?? 37%, re?
spectively, which provide material guarantee for the formation of bitumen and promote the precipitation of metals in the process of mineralization. It is concluded that the thermochemical reduction of sulfate with organic matter is an important mechanism of metal precipitation in the Erdaokan Ag ??Pb ??Zn deposit.
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