PALEOGENE VALLEY SYSTEM AND ITS CONTROL ON PROXIMAL CLASTIC DEPOSITS IN THE SOUTHERN SUB-SAG OF MIAOXI SAG, BOHAI BAY BASIN
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摘要:
为了更好地预测低勘探区有利砂体的展布，在综合利用测井、钻井、地震等资料的基础上，对渤海湾盆地庙西南洼古近系的沟谷特征及其对近源碎屑沉积的控制作用进行了研究。结果表明：与郯庐断裂近EW向垂直相交的大型基底断裂在古近纪表现为长期拉张沉降特征，形成区域性的大型沟谷，多控制着次级洼陷的发育；而与郯庐断裂NW向、NNW向相交的派生断层一般处于挤压应力状态，多发育小型挤压断裂型沟谷。这些小型沟谷在缓坡带和陡坡带的表现特征具有明显差异。通过地震反射、地震相、属性分析和钻井资料相结合的手段，识别并确定不同层段的近源碎屑沉积体的展布，对比发现：NE向或近EW向的区域性大型沟谷往往成为陆源碎屑物质的宏观进积方向，规模相对偏小的大型沟谷，对碎屑物质进积方向的控制作用更为明显；而NW向的小型挤压性断沟，只能控制局部陆源碎屑物质的进积，沿着这些小型沟谷进入盆地的方向，往往能够准确寻找到各类近源碎屑沉积体的位置，这将有利于指导庙西南洼古近系的勘探部署。
Abstract:In order to seek for subtle reservoirs and favorable sand bodies in low exploration blocks, this paper is devoted to the study of valley system and its controls over the proximal clastic deposits based on logging, drilling, seismic data, taking the Paleogene southern sub-sag of the Miaoxi Sag, Bohai Bay Basin as a case. It is observed that the basement faults roughly in east-west direction perpendicular to the Tan-Lu fault are characterized by long-term tensile subsidence in Paleogene. These faults always form regional valleys and control the secondary subsidence in the period. However, the northwestern or north-northwestern faults, which intersect the Tan-Lu fault at an acute angle, are general under extrusion stress. Mostly, they form small compressive faulting valleys. According to the geometry of the small valleys, they can be divided into subvalleys in various shapes, such as V-type, U-type, W-type subvalleys. The performance of these small valleys on the gentle slope are rather different to those on the steep slope. On the side of steep slope, small valleys control the development of compact fan delta. On the side of gentle slope, however, small valleys control the development of large-scale braided delta. It is useful and profitable to identify and determine the distribution of terrigenous clastic deposits at different layers using seismic reflection, seismic facies, attribute analysis, drilling data and so on as tools. The northeastern or near east-west regional valleys tend to form the macroscopic progradational direction of terrigenous clastic deposits. The smaller of the regional valleys, the more can control the direction of the main terrigenous clastic material into the basin. The small northwestern valleys, belonging to the compressive broken trench, can only control partial progradation of terrigenous clastic materials. Along the direction of these small valleys into the basin, it is often able to accurately find the location for proximal clastic deposition. To clarify the location of these small valleys is conducive to the following exploration and deployment.
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Key words:
- valley /
- proximal clastic deposits /
- Tan-Lu fault /
- southern sub-sag /
- Bohai Bay Basin
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