地震勘探方法在赵官井田岩浆岩解释中的应用
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摘要
赵官井田位于山东省的西北部,该区岩浆岩较发育,有三层岩浆岩呈岩床状侵入到煤系地层中。下层岩浆岩一般位于10煤以下,但在井田局部区域,也会上冲至10煤层,甚至达到7煤层,造成冲断条带两侧煤层底板形态发生剧烈变化,10煤或7煤直接吞蚀。依据赵官井田岩浆岩的发育规律及煤岩性特征,利用三维地震勘探方法查明了井田内三层岩浆岩的赋存状态,尤其对下层岩浆侵入形态以及对煤层的影响进行了解释,否定了以往地质资料中因岩浆侵入煤层而误解释为多条逆断层的存在。赵官庄井田三维地震勘探实例表明,岩浆岩冲断煤层在时间剖面上具有典型的响应特征,并指出下层岩浆岩的上冲的影响井田浅部煤层开采的一个重要地质因素。
The Zhaoguan minefield is in northwestern Shandong Province,magmatic rocks are well developed in the area,3 layers of magmatic rocks intruded into coal measures strata and present as sills.Lower layer magmatic rocks are generally under No.10 coal seam,but locally rushed up to No.10 coal even No.7 coal,made both side coal floors strongly deformed,No.10 or No.7 coal seams may be corroded away by lower layer magmatic rocks.According to magmatic rock development pattern and coal,rock characters in Zhaoguan minefield,using 3D seismic prospecting has identified hosting pattern of the 3 layers,especially interpreted lower layer magmatic intrusion configuration and impact on coal seams,and negated multiple reversed faults instead of magmatic intrusion in previous geological data.The Zhaoguan minefield 3D seismic prospecting has demonstrated that the intrusion into coal seam has typical response characteristic on time sections,and pointed out the magmatic rock rush up is an important geological factor to impact shallow part coal seams mining in the minefield.
The Zhaoguan minefield is in northwestern Shandong Province,magmatic rocks are well developed in the area,3 layers of magmatic rocks intruded into coal measures strata and present as sills.Lower layer magmatic rocks are generally under No.10 coal seam,but locally rushed up to No.10 coal even No.7 coal,made both side coal floors strongly deformed,No.10 or No.7 coal seams may be corroded away by lower layer magmatic rocks.According to magmatic rock development pattern and coal,rock characters in Zhaoguan minefield,using 3D seismic prospecting has identified hosting pattern of the 3 layers,especially interpreted lower layer magmatic intrusion configuration and impact on coal seams,and negated multiple reversed faults instead of magmatic intrusion in previous geological data.The Zhaoguan minefield 3D seismic prospecting has demonstrated that the intrusion into coal seam has typical response characteristic on time sections,and pointed out the magmatic rock rush up is an important geological factor to impact shallow part coal seams mining in the minefield.
引文
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