综合物探方法在四川庙坪石墨矿勘探中的应用

The Application of Integrated Geophysical Method to the Exploration of the Miaoping Graphite Deposit in Sichuan

石墨矿具有低阻高极化的电性特征,其找矿标志较为明显。通过开展自然电场法、激电测深、可控源音频大地电磁测深等物探电法相配合的找矿方法,在四川庙坪石墨矿找矿中取得了较好的找矿效果。本文通过自然电场法测量在研究区发现自然电位异常场的电位负异常带3处,且异常带形态、规模与石墨矿及其矿化带吻合较好。激电测深测量控制了Ⅱ号异常体在深部的大体分布范围及形态,可控源音频大地电磁测深测量克服了厚大矿体低阻屏蔽造成的影响。经探矿工程验证,圈定的异常带与矿体具有很好的对应性,结果表明综合物探方法自然电位+激电测深+CSAMT组合勘探在寻找隐伏石墨矿上可作为一种有效的间接找矿方法。

The application of natural electric field method with induced polarization sounding and controlled source audio frequency magnetotelluric sounding to the exploration of the Miaoping graphite deposit in Sichuan has achieved good prospecting results.Shape and scale of the 3 negative anomalies of spontaneous potential by the natural electric field method coincide with those of the graphite deposit and graphite mineralization zone.The IP sounding survey has control over the distribution and shape of anomalyⅡin the depth.CSAMT survey overcomes the influence of low resistance shield caused by the thick ore body.The results show that SP+IP+CSAMT can be used as an effective indirect prospecting method for concealed graphite deposits.