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苏南下二叠统堰桥组分布于宜兴—江阴一线以东地区,厚292—315m,根据岩性特征、沉积旋迴、古生物组合自下而上划为三段:下段为厚层深灰色粉砂岩和泥岩互层,厚110—135m;中段深灰色细砂岩、粉砂岩和泥岩互层,厚130—160m;上段为灰、浅灰色中粗粒长石石英砂岩,夹深灰色泥岩和3—4层砂质灰岩,厚45—80m。我们在苏南煤田勘探过程中,选择苏南东山和沙洲妙桥两个勘探区,在钻孔中系统采集了40余个砂岩样品,对龙潭组底部砂岩(即中粗粒长石石英砂岩)及堰桥组中、上段砂岩进行了一系列岩石
The Lower Permian Yanqiao Formation of the southern Jiangsu lies in the area east of Yixing-Jiangyin Line, with a thickness of 292-315 m. According to lithology and sedimentary cycles, the Paleontological combination is divided into three sections from bottom to top: the lower section is thick, dark gray Siltstone and mudstone interbedded with a thickness of 110-135m; middle-grained dark-grained fine sandstone, siltstone and mudstone interbedded with an interval of 130-160m; the upper section is composed of gray and medium-gray coarser feldspathic quartz sandstone with dark gray shale and 3 -4 layers of sandstone, thickness 45-80m. During the exploration of the southern Jiangsu coalfield, we selected two exploration areas, namely the Dongshan in the south of Jiangsu Province and the Miaqiao in Shazhou, systematically collected more than 40 sandstone samples from the borehole. The sandstone at the bottom of the Longtan Formation (ie, the coarse-grained feldspar quartz sandstone) And weir bridge group, the upper sandstone carried a series of rocks