塔里木盆地上寒武统地震相及沉积相分析

【摘要】 塔里木盆地范围广泛,单依靠钻井揭示和露头是无法对全盆埋藏较深的上寒武统地层的沉积特征进行定性分析和描述。针对盆地上寒武统地层地震相研究较少的现状,笔者通过覆盖全盆的600多条二维地震测线对地层的地震反射特征进行描述和总结,确定地震相和沉积相转换的关系。利用反射波的反射外形,内部构型,振幅,连续性和频率等地震反射特征,在上寒武统下丘里塔格组的反射中识别出了7种地震相,并将地震相转化为5种沉积相,确定了碳酸盐岩台地模式。本次研究显示塔里木西南地区和东部地区应该能发育良好的烃源岩,下一步的勘探重点应该在麦盖提地区。更多还原

【Abstract】 Because of wide area of Tarim basin,we can not analyze and desribe the sedimentary characteristics of upper cambiran which buried deep if we only rely on the drilling results and distant.The research on seismic facies is not enough,so we disribed and summarized the reflectance signature in more six hundreds 2D seismics for confirming the relation between seismic and sedimentary facies.According to the characteristics of seismic reflection such as amplitude,continuity,interior structures and exterior shapes,7 seismic facise were recognized from seismic reflection in the upper Cambrian xiaqiulitage formation.We transformed the sedimentary facies into 5 seismic facies and confirmed the model of carbonate platform.The research showed that good hydrocarbon source rocks would be developed in the west-southern and eastern areas of Tarim.Markit area should be the important target regions.更多还原