中国东部陆相单断式盆地地震相模式

MODELS OF SEISMIC FACIES FOR CONTINENTAL MONO-FAULTED BASINS IN EASTERN CHINA

本文描述了中国东部陆相断陷在其早、中、晚三个阶段的演化过程中,其一侧发育有单断湖盆的四个沉积背景区(陡坡区、缓坡区、湖心区和长轴入口区),在背景区上有序地分布着17类21种地震相的模式,并逐一描述其特征。双断式湖盆一般有中央隆起带的存在,其两翼次凹通常可与单断型盆地类比,故单断型模式的建立与分析,即可概括东部断陷的地震相模式.

Mono-faulted lake basin was developed on one side of the continental faultdown in eastern China during early, middle and late evolution stages. Four sedimentary environments are recognized, i.e. areas of steep shelf, gentle shelf, lake center and the lake entry along long axis. There are 21 kinds of seismic facies models in 17 categories distributed sequentially. The characteristics of tne models are described, seperately. Because a central upl-ifting zone generally exists in double faulted basins, with depressions on both flanks comparable to mono-faulted basin. The models of seismic facies in eastern China could be summerized as mono-faulted models.