论文部分内容阅读
通过使用普里兹湾的多道地震剖面的地质解释资料,对其地层结构和沉积特征进行了研究,并对其构造、沉积演化过程和油气资源潜力进行了分析.结果表明:研究区地层可以划分为5个沉积单元,包括前寒武纪(性质不确定)的变质岩基底(PS.5),晚二叠世-早三叠世期间和白垩纪期间的两期裂谷期沉积(PS.4及PS.3),晚始新世-中新世期间被冰川改造的被动大陆边缘沉积(PS.2)及上新世以来的冰川沉积(PS.1),其间均被不整合面所分隔.两期裂谷事件的沉积中心位于普里兹湾中部,并受断层控制.新生代以来沉积逐渐向着陆架外缘进积加厚,并被冰川作用所改造,沉积环境也由中生代的陆相转变为新生代的滨海相、冰川相.普里兹湾的白垩世和中新统有较高的有机碳含量,而其间的沉积类型为冰川沉积,有机碳含量很低.后者可能是由于冰川的底侵作用,使得深部有机碳含量较高的沉积在上部重新沉积的结果,普里兹湾断陷盆地区的PS.3以及陆架外缘以及陆坡深水区的PS.2上部(中新统)可能是油气的潜力生成区.
The stratigraphic structure and sedimentary characteristics of the Prydz Bay multi-channel seismic profile are studied and the tectonic, sedimentary evolution and potential of oil and gas resources are analyzed.The results show that the strata of the study area can be It is divided into five sedimentary units, including Precambrian (undefined) metamorphic basement (PS.5), Late Permian-Early Triassic and Cretaceous Period Rift Deposition (PS .4 and PS.3), passive continental margin deposition (PS.2) during the late Eocene-Miocene, and glacial deposition (PS.1) since the Pliocene, during which both were unconformity The depositional centers of the two Rift events are located in the middle of the Prydz Bay and are controlled by faults.The sediments of the Prydz Bay gradually thicken toward the outer edge of the shelf since the Cenozoic and are reformed by the glaciation, Of the continental facies into the Cenozoic coastal phase, glacial facies.The Cretaceous and Pliocene of Prydz Bay have higher organic carbon content, while the sedimentary type is glacial sediment with low organic carbon content.The latter Possibly due to the under-invasion of glaciers, sediments with higher organic carbon content were observed Upper redeposited result, Prydz Bay off the upper basin area PS.3 PS.2 depression and outer continental shelf and deepwater continental slope area (Miocene) may be potential oil and gas-producing region.