The basic structure of reservoir models is strongly affected by the stratigraphic interpretation and the properties of reservoir rock. The estimation of the volume of hydrocarbon accumulation will depend on the accuracy of predicting and distributing reservoir quality. Biostratigraphic and sedimentary petrologic results provide geological information to clarify the stratigraphy and properties of sedimentary rocks on the eastern margin of the Cuu Long delta plain trough. On the basis of stratigraphic correlation of the wells and studying the structures of the area, the deposition, thickness of sediments and the ability to correlate with prospect rocks on the southeastern Vietnam continental shelf were determined. The results have identified the basement rock of wells TC-1 and TC-2, which are Cretaceous metasandstones and were deposited in freshwater fluvial environments with high-energy conditions. The upper Paleogene sediments were overlaid directly on the Cretaceous basement rock in the TC-2 well but were completely absent in the TC-1 well. The lithologic composition is mainly feldspathic litharenite sandstone, which is formed in freshwater fluvial and freshwater lacustrine environments. This study provides new data on stratigraphic column of the eastern Cuu Long delta plain. The data show that the age of the sedimentary basement rock is Cretaceous which has not been determined in previous studies. The findings of this study can help for better understanding of the geological development history and the completely stratigraphic column of the Cuu Long delta to correlate with objects that are hydrocarbon accumulation in Cuu Long sedimentary basin in order to improve efficiency in petroleum exploration activities.

储层模型的基本结构受到地层解释和储层岩石性质的强烈影响。油气聚集量的估计将取决于预测和分配储层质量的准确性。生物地层学和沉积岩石学结果提供了地质信息，以阐明Cuu Long三角洲平原槽东缘的沉积岩的地层学和性质。根据井的地层相关性，并研究该区域的结构，确定了越南东南部陆架上的沉积物，沉积物厚度以及与潜在岩石的关联能力。结果确定了TC-1和TC-2井的地下岩石，它们是白垩纪的阶砂岩，沉积在高能条件下的淡水河床环境中。上古近纪沉积物直接覆盖在TC-2井的白垩纪基底岩石上，但在TC-1井中完全不存在。岩性成分主要是长石斜长石砂岩，形成于淡水河床和淡水湖相环境中。这项研究为东部库隆三角洲平原的地层柱提供了新的数据。数据表明，沉积基底岩石的年龄是白垩纪，以前的研究尚未确定。