豫西二叠系煤成气的运移和紫斑岩的形成

成煤作用可生成大量气体和液体。这些气体和液体在岩层中运移时,可使岩石中的高价氧化物还原成低价氧化物,生成次生矿物如菱铁矿鲕粒或结核,同时使岩石的颜色改变,由红色变为灰色,或者变为紫斑岩。由于上述改变属于煤成气运移过程留下的遗迹,可以用来追索煤成气的运移,寻找浅层煤成气藏。 

THE RELATIONSHIP BETWEEN MIGRATION OF COAL GAS AND FORMATION OF PURPLE PORPHYRY IN PERMAIN SYSTEM OF WESTERN HENAN

reat much of gas and liquid may be created in the process of incoalation,which can changehigh valence oxides in the contacted rocks into low valence oxides in the process of migration and produce alot of authigenic minerals,such as siderite oolite and nodular. At the same time,the red rocks can be changedinto grey rocks or purple porphyry.Trace made by above changes may be used for tracing the migration ofcoal gas and finding out the shallow gas reservoir.