柴达木盆地德令哈坳陷石炭系分布特征

摘要

Qaidam Basin has rich Jurassic, Tertiary, Neogene and Quaternary oil and gas resources which occur in northern Qaidam Basin, western Qaidam Basin, and Sanhu region in eastern Qaidam Basin respectively. These areas have therefore been selected as the major exploration targets by Qinghai Oilfiled Petroleum Company. With the progress in the study of northern Xinjiang Carbonifer⁃ous strata and the success in drilling, the Carboniferous has already become the important exploration strata in western China, and much importance has been attached to the Carboniferous strata of Qaidam Basin by the explorers. Surface geological survey shows that the Carboniferous strata of Qaidam basin are a set of potential hydrocarbon source rocks, and DLHA area is the one that has de⁃veloped Carboniferous rocks with favorable conditions for hydrocarbon. Through the processing, interpretation and comprehensive research on the MT exploration data of DLHA area in the east of Qaidam Basin, the authors re-recognized the existence and distribu⁃tion characteristics of the Jurassic and Carboniferous strata, defined the characteristics of the carboniferous and Jurassic distribution, and pointed out that the bulge of Dragon Brooke is the favorable area for exploring the Carboniferous strata.%柴达木盆地具有丰富的油气资源，柴北缘、柴西、柴东三湖地区分别以侏罗系、古近系、新近系和第四系为主要勘探目的层。随着准噶尔盆地石炭系研究的进展和钻探的成功，石炭系已经成为中国西部地区重要的勘探层系。柴达木盆地的石炭系广泛发育，厚度较大，为一套碎屑岩与碳酸盐岩混合岩系，地质调查表明，石炭系为柴达木盆地一套潜在烃源岩。德令哈地区是柴达木盆地石炭系出露最多、地层层序最完整的地区。通过对德令哈及柴东地区MT勘探资料的处理解释和综合研究，对石炭系分布进行了深入研究，认为石炭系分布范围广、厚度大、构造稳定，其中欧龙布鲁克凸起油气成藏条件有利，是勘探的有利目标。