【摘要】 对国外报道的砂岩侵入体与中国南海珠江口盆地的岩心、测井曲线和地震反射等资料的对比分析,认为珠江口盆地发育有砂岩侵入现象,其特征在岩心中表现为不同规模的泥岩碎屑,大量的液化和泄水构造以及砂岩褶皱与充填等构造类型;在测井曲线上表现为伽马曲线总体呈箱状,倾角测井呈杂乱状,偶见高陡倾角的特征;在地震剖面上表现为翼状侵入或锥状侵入的反射异常,其反映的砂岩侵入的规模较大,对于小型岩墙和岩床的识别还需要更高的地震分辨率。更多还原

【Abstract】 A sand injectite phenomenon is recognized in the Zhujiangkou Basin of the South China Sea through an analytical comparison of core,well logging and seismic data with those reported abroad.These sand injectites are characterized by mudstone debris in different scale and various structures including liquidized deformation,dewatering,folding and filling of sandstones.Their Gamma curves are almost box-shaped and the dipmeter logs are unorderly,casually with a high-and-steep dip.Thus,this phenomenon in seismic profiles indicates a winglike or coniform intrusion,which,however,exclusively suggests sand injectites on a relatively large scale.As for the recognition of small-scale dikes and sills from deposited parent sandstones,seismic profiles with a higher resolution are needed.更多还原