莺歌海盆地SE区上中新统重力流与内波内潮汐沉积新认识

综合利用岩心、微电阻率成像和常规测井资料，对莺歌海盆地东方构造带SY区和SE区上中新统黄流组一段地层的沉积特征进行了系统分析。研究结果表明，黄流组一段地层发育一套海底扇背景下细粒沉积体，在重力流沉积过程中受到深水牵引流中的内波内潮汐的改造，形成了5种典型的岩相类型:（1）双向砂纹层理细砂岩相；（2）波状、脉状和透镜状层理砂泥互层相；（3）双泥岩纹层、泥质条带细砂岩相；（4）块状层理、递变层理细砂岩相；（5）漂浮泥屑、泥砾细砂岩相。研究表明，SE区黄流组一段整体上以重力流沉积为主，少部分内波内潮汐沉积，同时可见重力流和内波内潮汐沉积互层。 

Gravity flow and internal wave and internal tide deposits in Upper Miocene of SE area,Yinggehai Basin

Integrated with cores, micro-resistivity images and conventional logs, deposits in the 1st member of the Huangliu Formation of the Upper Miocene in the SY and SE areas in the Dongfang tectonic belt of the Yinggehai Basin were analyzed in detail. It was shown that a set of fine-grained deposits of submarine fan developed in the 1st member of the Huangliu Formation, and the deposits were reformed by internal wave and internal tide of deep-water tract current during gravity flow deposition process, forming 5 typical lithofacies: 1) fine-grained sandstone with bidirectional sand ripple; 2) laminated sand and shale with flaser, wavy and lenticular bedding; 3) fine-grained sandstone with double mud layers or mud stripe; 4) Massive and graded fine-grained sandstone; 5) fine sandstone with floating mud clasts or mud debris. The 1st member of the Huangliu Formation in the SE area was mainly gravity flow deposits and partially internal wave and internal tide deposits, and the 2 kinds of deposits coupled locally.