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根据高分辨率层序地层学研究,将TZ地区志留系划分为1个完整的二级层序,3个三级层序。该区发育了3大类准层序组,具有不同的相序和砂体组合特征,海平面升降和层序演化控制了砂体类型的分布和空间展布趋势。TZ地区志留系沉积时显示出波状的海岸格局,具有隆坳相间的微地貌特征,最好的砂体位于海侵体系域,滨岸砂或沿岸砂坝、潮汐水道砂的展布方向与厚度等值线趋势一致,其结合处是布井优选位置。
According to the high-resolution sequence stratigraphic study, Silurian in the TZ area is divided into a complete secondary sequence and three tertiary sequences. There are three major types of quasi-sequence group developed in this area, which have different characteristics of phase sequence and sand body assemblage. Sea level rise and sequence evolution control sand body type distribution and spatial distribution trend. The Silurian sediments of TZ show a wavy coastal pattern with microtopography of long and intergranular facies. The best sand bodies are located in the transgressive system tract, the coastal sand bar or the sand bar along the coast, and the distribution direction of the sand in the tidal channel and The trend of thickness isoline is the same, the combination of them is the preferred position of well laying.