论文部分内容阅读
柴达木盆地西部地区是柴达木盆地油气勘探开发研究程度最高的地区,地层发育特征对该区油气成藏有重要的地质意义。根据野外露头、钻井、古生物等资料,结合测井、岩芯、地震以及青海油田应用资料分析,认为柴达木盆地基底具有双重基底结构,即古生代褶皱基底和元古代结晶基底。柴达木盆地西部地区从晚侏罗纪开始接受沉积,其沉积中心在各个时期持续迁移。在晚中生代沉积中心位于阿尔金山前,古近纪沉积中心逐渐迁移至狮子沟地区,到了新近纪沉积中心向东南方向迁移至茫崖以东。在古近纪至早新近纪,柴西地区为持续沉积阶段,到了晚新近纪至第四纪,柴西地区开始严重剥蚀。
The western Qaidam Basin is the most studied area for oil and gas exploration and development in the Qaidam Basin. The stratigraphic development features have important geological significance for hydrocarbon accumulation in this area. According to the field outcrops, drilling, paleontology and other data, combined with logging, core, earthquakes and application data analysis of Qinghai Oilfield, the basement of Qaidam Basin is considered to have double basement structure, that is, Paleozoic fold basement and Proterozoic crystal basement. The western Qaidam basin began to sediment from the Late Jurassic and its sedimentary centers continued to migrate at various times. In the late Mesozoic sedimentary center located in front of the Altun Mountains, the sedimentary center of the Paleo-Cenozoic gradually migrated to the Shizigou area and migrated to the east of Mangya in the southeastward direction. During the Paleogene to early Neocene, the Qaidam region continued to be deposited. By the late Neogene to Quaternary, the Qaixi region began to be seriously eroded.