物探资料在安徽淮北地区煤田预测中的应用

在新生界地层巨厚覆盖区没有钻孔控制的情况下,可利用以往重力、电法等物探资料进行煤田预测。首先根据邻区资料分析区域构造和成矿条件,还原岩相古地理、聚煤期构造及聚煤后构造变动,对预测区的含煤地层进行评价;然后根据已有的电法资料分析曲线类型,与相邻区比较后确定含煤地层电法曲线类型,作定量、半定量分析,并根据重力资料,反演计算出新地层底界与灰岩(寒武—奥陶系)顶界的深度,再结合其它物探资料和邻区相关地质资料,对煤田前景进行预测。

Application of Geophysical Prospecting Information in Coalfield Prediction in Huaibei Area,Anhui

In very thick Cenozoic strata covered and no drilling controlled areas,can carry out coalfield prediction through the use of previous geophysical prospecting information including gravity,electric data etc.The first step is based on neighboring area information to analyze tectonic and coal forming conditions,restore lithofacies and paleogeography,coal accumulation stage structure and succeeding tectonic events,assess coal-bearing strata in predicting area.Then based on existing electric method data analyze curve type,after comparison with neighboring area data,determine coal-bearing strata electric method curve type,make quantitative,semi-quantitative analyses;based on gravity method data,inversion calculate Cenozoic strata bottom and limestone top depths,then combine with other geophysical prospecting data and neighboring area related data,carry out coalfield prospect prediction.