侵蚀面的确定,在野外是以沿顺层理的冲刷面或以某些特殊岩类夹层的存在为标志。但在井下确定侵蚀面的存在与否,却只能结合地面资料或者区域资料从一些指示性的岩矿为根据,因为井下被研究的对象仅仅是一段岩心柱甚至是一包小砂样。 在川东××构造的××井三千多米井深取出一段1.1米的长灰褐色坚硬致密的岩心,层位是P_2~1底部。当时对这段岩心众说不一:有的说是泥砾,有的认为是球状泥岩,有的则干脆叫做杂豆岩等等。 The determination of the eroded surface is marked in the field by the facies flushing along the bedding or by the presence of some special interbeds. However, determining the presence or absence of eroded surface in the ground can only be based on ground data or regional data from some indicative rock and mine, since the target under study is just a core column or even a small sand sample. A depth of 1.1 meters of long, taupe, hard and dense core was removed from well depths of ×× constructed in the eastern part of Sichuan Province by a depth of more than 3000 meters. The horizon is at the bottom of P_2 ~ 1. At the time of the core of the crowd different: some say it is mud gravel, some think spherical mudstone, while others are simply called razor rock and so on.