摘要
海相盆地及大型陆相盆地中一些低位扇体往往与油气富集有关。鉴于小型断陷湖盆的层序地层格架中低位地质体特征不明显的特点,笔者在研究小型断陷湖盆过程中引出了特殊低位地质体的概念,并在典型小型断陷湖盆——泌阳凹陷层序地层研究的基础上,在层序地层格架内找到了一些特殊低位地质体。这些特殊低位地质体均具有明显的特征:地震反射呈双向下超结构;自然电位测井曲线呈箱型或钟型,电阻率测井曲线呈指状形态;均方根振幅体与其周围振幅明显不同;经测井约束反演的波阻抗明显比周围数据体大。这些地球物理特征不仅能证实特殊低位地质体找寻的可靠性,也是找寻特殊低位地质体的方法和手段。
Some low-positional fans in marine basins and large-scale of continental basins are often relative to oil/gas accumulation. In view of unclear feature of low-positional geologic bodies in sequence-stratigraphic framework of minor faulted lake basin,the authors introduced the conception of special low-positional geologic bodies in a process of studying minor faulted lake basin and found some special low-positional geologic bodies in sequence-stratigraphic framework on the basis of studying typical minor faulted lake basin-sequence-strati-graphic framework of Miyang sag. These special low-positional geologic bodies have distinct fea- ture: the seismic reflections are characteristics of downlap structure in both direction;the self potential logging traces are box- or bell-shaped characteristics; the resistance logging traces are character of fingers; there is significant difference between the mean-square-root amplitude volume and surrounding amplitudes; the impedance by logging-constrained inversion is significantly greater than surrounding data volume. These geophysical characters not only verify reliability special low-positional geologic bodies being looked for,but also are means and tools looking for special low-positional geologic bodies.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2005年第5期565-568,584,共5页
Oil Geophysical Prospecting
基金
湖北杰出青年基金项目(2003AB13012)资助。
