柴达木三湖地区第四系地震相类型及沉积体系

Quaternary Seismic Facies and Sedimentary System in the Sanhu Area, Qaidam Basin

三湖地区第四系气藏是我国独特的生物气藏,同时也是国家"西区东输"的重要战略气源区,地层年代非常新。根据典型地震相单元外形和内部反射结构特征,通过利用大面积覆盖的二维地震资料识别出了前积相,丘形地震相,透镜体地震相,席状披盖相,杂乱相等骨架地震相,并研究了第四系七个泉组地震相平面分布特征。在对地震相进行岩心和测井沉积相标定后,确立了地震相与沉积相对应关系,并以此利用地震相特征预测了区域沉积体系分布模式,进而明确研究区主要物源方向与展布范围以及特殊沉积相带的发育模式。

The Quatemary gas field in the Sanhu area, Qiadam is distinctive biogas in China. This paper divided seismic facies in the Sanhu area into sigmoid-progradation seismic facies, chi-shaped seismic facies, lenticular seismic facies, sphinx cover facies and chaotic earthquake facies, and has a discussion on their distribution and relation between seismic facies and sedimentary facies and predicts the distribution pattern of regional sedimentary system.