Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.Oil - yielding organic matter is contained in the shales.在这些页岩里有产油的有机物质.Alternating sandstones and shales are regarded as important.蚀变的砂岩和页岩是很重要的....
Oil - yielding organic matter is contained in the shales.在这些页岩里有产油的有机物质.Thus clays and shales tend to be impermeable.因此粘土和页岩就往往不透水.Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.Alternating sandstones and...