摘要
生物礁是生物受自身营造作用而形成骨架,并在其上下(或邻接)有特定相序的地质体,区别于虽由生物组成,却不具营造骨架和特定相序的碳酸盐堆积体。礁格架的形态、生长方式及其邻接相序的组合关系是判别古礁类型,成礁环境和成礁期的最直接、可靠的依据。文中提出了判别礁坪相、礁前与礁后相的依据及某些油气探查方向。
According to principles of comparative sedimentology and on the basis of environment-action-product model of modern organic reef, this paper points out both direct and indirect marks for determining ancient reefs.
Organic reef is a geologic body with frames built up by the organisms themselves and with a certain facies sequence linked to the sorrounding bodies, much different from a carbonate accumulation body which is also made up of organisms, but with neither a built frame nor a certain facies sequence.
Shape and growth form of reef frame and its association relation with the adjacent facies sequence serve as the most direct and reliable marks to determine ancient reef type and reef formation environment and time. Recognition of reef-flat, reef-front and backreef facies is an important basis for recognizing reef bodies in an area where reef frame is absent.
Geochemical, geophysical, dolomitization characteristics and organic assemblages are indirect basis for determining reef bodies.
This paper also points out oil and gas prospects in Permian and Tertiary organic reef areas in eastern Sichuan and the South China Sea.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1990年第2期13-24,共12页
Marine Geology & Quaternary Geology
基金
国家自然科学基金委员会资助项目
