论文部分内容阅读
大港探区上古生界近期取得一系列勘探突破,展现出良好的勘探前景,已成为重要的储量接替领域.但其勘探程度较低,对于沉积相类型与沉积演化认识上的欠缺制约着该层系勘探的深入和井位的部署.以沉积学理论为指导,在岩心、薄片、测井和录井等资料研究的基础上,明确了区内上古生界各组发育的沉积相类型与沉积演化过程,分析了沉积相发育的控制因素.研究表明,区内本溪组发育障壁海岸相和碳酸盐台地相,太原组发育障壁海岸相、碳酸盐台地相和湿地相,山西组发育浅水三角洲相,下石盒子组和上石盒子组发育河流相.本溪组至上石盒子组的沉积相类型反映了晚古生代海侵作用的肇始、发展、衰退的过程.构造作用、海平面变化和古气候共同控制着沉积相类型的发育.
Recently, a series of exploration breakthroughs have been made in the Upper Paleozoic of the Dagang exploration area, showing a good exploration prospect, which has become an important reserve replacement area. However, its exploration level is relatively low, which lacks understanding of sedimentary facies types and sedimentary evolution. Based on the study of sedimentology theory and based on the study of core, thin slice, well logging and logging data, it is clear that the sedimentary facies type and deposition in each group of Upper Paleozoic in the area are clear The evolutionary process and the controlling factors of sedimentary facies development are analyzed.The results show that the coastal facies and carbonate platforms in the Benxi Formation are developed, the faulted coastal facies in the Taiyuan Formation, the carbonate platform and the wetland facies are developed, and the shallow water Delta facies, lower Shihezi Formation and Upper Shihezi Formation.The sedimentary facies types of Benxi Formation to Upper Shihezi Formation reflect the process of initiation, development and decline of late Paleozoic transgression.The tectonism, sea-level change and ancient Climate co-controls sediment-type development.