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本文探讨了三八七矿床矿层被揭穿后γ测井结果不断降低的原因。在否定射气的逸散对γ测井结果有显著影响的前提下,根据矿石浸泡实验数据,并借鉴矿床地质和水文地质资料,提出了γ测井结果与冲洗液溶滤作用密切有关的认识。该矿床严格受断裂构造控制,大部分铀、镭以吸附形式赋存于构造角砾岩和碎裂岩的泥碳质胶结物或充填物中,极易溶于水。含矿构造是该矿床唯一的含水层,含矿构造水具有承压性质。含矿构造被揭穿后,在继续钻进过程中,由于钻孔冲洗液水位高于承压水位,冲洗液将从钻孔不断注入含矿构造,使铀、镭不断溶滤并迁移,造成γ测井结果不断降低。
This article explores the reason why the γ logging results are continuously deteriorated after the coal seam of Sanbaqi deposit is exposed. Based on the experimental data of ore soaking and the geological and hydrogeological data of the deposit, the results of γ logging are closely related to the leaching effect of rinsing solution . The deposit is strictly controlled by the fault structure. Most of the uranium and radium occur in adsorption form in mud-carbonaceous cements or fillings that constitute breccias and cataclasites, and are highly soluble in water. The ore-bearing structure is the only aquifer in the deposit, and the ore-bearing structural water is of a pressure-bearing nature. After the ore-bearing structure has been exposed, the drilling fluid will be continuously injected into the ore-bearing structure from the borehole due to the water level of the drilling fluid above the pressure level during continuous drilling. As a result, uranium and radium continue to be leached and migrated, resulting in γ Logging results continue to decrease.