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一、地质情况我队在四川南川南平工区的五个井田中,有三个井田位于龙骨溪大背斜西北翼的倒转部分,上部为棲霞和茅口两层石灰岩,并已裸露地表,一般厚度达400—500公尺,岩层倾角一般由60—70°;下部为85.605—140公尺厚的乐平煤系,以见长兴灰岩而终孔。由于石灰岩质地较纯,遭受严重风化,溶触后侵触基准面深达300余公尺,同时地质构造复杂,岩石极端破碎。据现有资料证明,仅砚石台一个井田断层就
I. Geological Conditions Among the five fields in the Nanping area of Nanchuan, Sichuan, three of the fields are located in the inverted part of the northwest wing of the Longxiangxi anticline, and the upper part is composed of two layers of limestone, Qixia and Maokou. The surface has been exposed with a typical thickness of up to 400-500 meters, rock dip angle generally 60-70 °; the lower part of 85.605-140 meters thick Leping coal system to see Changxing limestone and the final hole. Due to the relatively pure texture of limestone, it suffered severe weathering. The contact surface of the limestone reached a depth of more than 300 meters. At the same time, the geological structure was complicated and the rock was extremely crushed. According to the available data, only a lithosphere fault in Yan Shitai