测井曲线在许疃井田煤岩层对比中的应用

许疃井田位于安徽省宿州市西南部,临涣矿区的南端。井田东西宽3～7km,南北长8～12km,勘探面积约55km。通过分析该区视电阻率、自然伽马和伽马伽马等测井曲线的形态及组合特征,对该井田的煤岩层进行综合对比。其中82煤层下铝质泥岩的高伽马异常可作为本井田82煤层判定的主要依据;而位于11煤层至石炭系第一层石灰岩间自上而下的缓波状视电祖率曲线形态与自然伽马曲线幅值相对较高的组合特征,可作为二叠系煤系地层与石炭系地层划分依据。三个实例表明在该井田利用测井曲线异常形态及组合特征,可有效进行煤岩层变化规律研究、层位划分及断层判定。

Application of Logging Traces in Xutuan Minefield Coal Seams and Strata Correlation

The Xutuan minefield is situated in southwestern part of Suzhou City, Anhui Province, at the south end of Linhuan mining area, The minefield is 3～7km wide from east to west, 8～12km long from north to south, with an exploration area about 55km^2. Through apparent resistivity, gamma-ray and gamma-gamma traces configuration and combined features analyses, comprehensively correlated coal seams and strata in the minefield. The high gamma anomaly of the aluminous mudstone under the No.82 coal seam can be the main basis to determine the No.82 coal seam in the minefield; while the combined features of gentle undulant resistivity curve configuration and relatively high gamma-ray curve amplitude between No.11 coal seam and Carboniferous first limestone can be the basis to divide Permian coal measures and Carboniferous strata. Three instances indicated that to use anomalous configuration and combine features of logging traces in the minefield can effectively carry out coal seam and strata variation regularity study, horizon division and fault determination.