塔里木盆地台盆区中-下寒武统地震相特征及沉积相分布

Seismic facies characteristics and distribution of sedimentary facies of middle-lower Cambrian in Tarim Basin

基于塔里木盆地钻遇中-下寒武统近30口井钻井、测井、元素地球化学及元素录井资料,200余条区域二维、三维地震测线,结合野外露头剖面等资料,利用地震波形分类分析技术总结台盆区地震反射特征,在中-下寒武统划分出强振幅好连续中-低频平行席状亚相、中强振幅好连续中-高频平行、亚平行席(板)状亚相等5类8种具有沉积意义地震亚相。综合地震相、钻井标定、岩性组合等在中-下寒武统识别出碳酸盐缓坡、台地、台地边缘、台缘斜坡、陆棚和盆地等6种沉积体系。研究认为中、下寒武统发育两套储盖组合,是深层寒武系油气勘探潜力领域。

At present,there are only less than 30 wells to reveal the middle lower Cambrian in Tarim Basin.This paper mainly studies the seismic facies characteristics of the middle lower Cambrian,base on the data of drilling,logging data,elemental geochemistry data,elements logging data and more than 200 regional 2D and 3D seismic lines,also combining the data of outcrop.According to the seismic waveform classification and analysis tech-nology,the study shows that the middle lower Cambrian in Tarim Basin can be divided into five classes eight typical seismic facies with sedimentary significance which including the strong amplitude good continuous mid-low fre-quency parallel sheet subfacies,medium-strong amplitude good continuous medium-high frequency parallel and subparallel sheet subfacies,etc.Through the study of seismic facies,drilling calibration,the lithology combination,etc.six types of sedimentary facies of the middle-lower Cambrian were identified;Carbonate ramp,platform,platform margin,platform margin slope,shelf and basin.The results of research show that two sets of storage cap combination would be developed in the middle lower Cambrian,which is the oil and gas exploration potential areas in deep Cambrian.