摘要
为了对沉积体系中各种沉积环境地层的物性进行精细研究,对塔里木盆地柯坪—巴楚露头区台地边缘—斜坡沉积体系和碎屑滨岸带沉积体系的地层进行了踏勘取样。在常温、常压下对岩样进行了超声波纵、横波速度测量,主要获得以下结论:(1)岩样超声波速度与岩样所处的沉积环境关系密切,在生物礁剖面上,从礁基、礁核、到礁盖速度递增;在三角洲剖面上,从水下分流河道、河口坝到前缘泥速度递增。(2)在生物礁剖面上,生物屑的含量是影响速度的主要因素。生物碎屑含量越高,速度越低。(3)生物礁内生物的大小与生长方向是控制岩样速度各向异性的主要因素之一。
In order to make a scrutiny into physical properties of formation in various depositional environments, we carried out a geological exploration and collected a lot of samples from platform edge clinoform system and chipping sedimentary system in outcrop area located in Keping-Bachu, Tarim Basin, and Northwestern China. After analysis of the ultrasonic measurements of the samples at normal temperature and standard atmosphere in the laboratory, the conclusions are given as follows ： （ 1 ） There is a close relation between ultrasonic velocities of samples and depositional environment. In the bioherm profile, the velocity increases from reef base, reef core to reef cap ; in the delta profile, the velocity increases from distributary channel to delta front. （2） In the bioherm profile, the biodetritus is the key influencing factor to velocity ; the richer organism of the sample is, the higher the velocity is. In the sandstone profile, the larger the filling extent of the sandstone pore is, the higher the velocity is. （3） The growth direction of organisms is a principal factor, which controls the extent of the velocity anisotropy. The velocities are different between along and against growth direction of organisms. These results can be used to guide geophysical forward modeling, geophysical inversion, seismic interpretation and reservoir prediction.
出处
《沉积学报》
CAS
CSCD
北大核心
2009年第2期312-318,共7页
Acta Sedimentologica Sinica
基金
中国石油化工集团公司前瞻性项目专题(编号:2007026230)
国家自然科学基金项目(批准号:40174033)资助
关键词
超声波速度
生物礁
潮坪
三角洲
塔里木盆地下古生界
ultrasonic velocity, bioherm, tidal fiat, delta, Lower Paleozoic of Tarim Basin
