摘要
四川盆地寒武系的底界,既存在与中国乃至全球一致的生物地层界线,完全对应于年代地层单位界线,其界线点为第一个小壳化石带Anabarites-Protohertzina-Arthrochites组合带之底;同时还存在一条生产上实用的辅助界线,即岩石地层单位界线,界线点为碳酸盐岩和碎屑岩的分界,完全对应于测井曲线伽玛值突然降低的界线。从多重地层划分理论的角度来说,这两类界线都是合理并实用的,很好地解决了寒武系与震旦系分界线长期争论的问题。
In Cambrian bottom boundary of Sichuan Basin,there exist both a biostratigraphic boundary and a lithostratigraphic boundary.The former corresponds to the boundary of chronostratigraphic unit.Its boundary point is the bottom of the first small shelly fossil belt(Anabarites-Protohertzina-Arthrochites).The latter,also a functional and assistant one used for exploration,corresponds to the boundary at which gamma value of well-logging curve decreases suddenly.Its boundary point is the boundary of carbonate and clastic rocks.In terms of multiple-stratigraphic division theory,those two boundaries are reasonable and practical,and they solve the boundary problem of Cambrian and Sinian.
出处
《天然气勘探与开发》
2013年第1期1-4,11,共5页
Natural Gas Exploration and Development
关键词
多重地层划分理论
寒武系底界
岩石地层单位
生物地层单位
年代地层单位
测井地层单位
multiple-stratigraphic division theory,Cambrian bottom boundary,lithostratigraphic unit,biostratigraphic unit,chronostratigraphic unit,well-logging stratigraphic unit
