一厚达4000—5000米的白堊纪地层,是构成某盆地的生、含油层系及主要储油构造层。从柱状剖面上可以看到,这套地层以粘土岩、细碎屑岩为主,没有成层的碳酸盐、成层的可溶盐类和成层的煤。碎层岩中,粉砂岩占较大的比例,其次为细砂岩,粗砂岩很少,除最底部及某些边缘部分外,而巨砾几乎是绝无仅有的。 A thick Cretaceous layer of 4000-5000 meters, is composed of a basin of Health, oil-bearing strata and the main oil-bearing structural layer. As can be seen from the columnar section, this formation is dominated by claystone and finely divided clastic rocks without stratiform carbonate, stratified soluble salts and stratified coal. Lithic sandstone accounts for a large proportion of sandstone, followed by fine sandstone, few sandstone, except for the bottom and some edge, while the boulder is almost unique.