福建龙岩白沙地区地质特征与找煤潜力分析

白沙地区位于龙永煤田的北部,区内地质条件复杂,东部大面积出露白垩系上统沙县组,西部出露二叠系中统童子岩组,北部出露奥陶系中上统罗峰溪组及泥盆系上统天瓦栋组。童子岩组含煤岩系含可采煤层5层,局部可采煤层3层,大部分隐伏于深部。区内构造以断裂为主,推覆构造发育,主要有印支期的滑脱断层,燕山期的逆冲推覆断层,推覆构造控制煤系的赋存厚度与形态。应用"红层下"与"老地层推覆体下"找煤理论,认为东部"红层"下、北部"老地层"下具有找煤潜力。

Baisha Area Geological Features and Coal Prospecting Potential Analysis in Longyan,Fujian

The Baisha area is situated in the northern part of Longyong coalfield. Geological condition in the area is quite complex, large area of upper Cretaceous Shaxian Formation outcropped in the east, middle Permian Tongziyan Formation outcropped in the west, middle and upper Ordovician Luofengxi Formation and upper Devonian Tianwadong Formation outcropped in the north. The Tongziyan Formation coal measures contain 5 mineable coal seams, 3 locally mineable coal seams, mostly hidden in deep part. Structures in the area are mainly faults, nappe structures developed, mainly Indo-Chinese epoch decollement faults, Yanshanian thrusting nappe faults; nappe structures controlled coal measures thickness and configuration. Through the ＂red bed underlying＂ and ＂old nappe strata underlying＂ coal looking theory, reckoned that ＂red bed＂ underlying and northern part ＂old nappe strata＂ underlying have coal prospecting potential.