论文部分内容阅读
南黄海盆地是中国海域历经54年勘探至今尚未实现工业油气发现的唯一大型含油气盆地,特别是29年前发现的白垩系黑色页岩含轻质油,属于页岩油范畴。分析了南黄海盆地白垩系勘探研究现状,提出白垩系主要分布于盆地北部,有8口井钻遇,K1系红浦口组,K2系黑泰州组,与苏北盆地近似;在最新地震测线上表现为顶蚀,与古/新近系及下伏侏罗系均呈不整合接触,斜层状分布,残留沉积,部分构成次凹的特征。通过近海灵山岛露头调查、剖面实测和包括常规生油岩有机质丰度、类型、成熟度、等离子质谱、U-Pb同位素年龄等测试,发现下白垩统多套深灰黑色含煤泥岩层,发育Ⅰ型和Ⅲ型干酪根,自由烃0.02~0.07mg/g或为零,生油潜力0.06~0.03mg/g或为零,残留有机碳1.85%~1.99%或0.70%~0.84%,氧指数4及超过10,属于2类烃源岩,分别生烃和二氧化碳气。总体认为南黄海盆地白垩系具有一定资源前景,值得开展深入分析。
The South Yellow Sea Basin is the only large-scale petroliferous basin in the Chinese sea that has not yet been discovered for industrial oil and gas after 54 years of exploration. In particular, the Cretaceous black shale that was found 29 years ago contains light oil and belongs to the shale oil category. Based on the analysis of the research status of the Cretaceous exploration in the South Yellow Sea Basin, it is suggested that the Cretaceous is mainly distributed in the northern part of the basin. There are 8 wells drilled in this area. K1-Hongpukou Formation and K2-Heitaizhou Formation are similar to the Northern Jiangsu Basin. It is characterized by top erosion, unconformity contact with Palaeo-Neogene and underlying Jurassic, oblique distribution, residual sedimentation and partial subfacies. Based on the investigation of outcrop of Lingshan Island in the offshore area, the measured results of the profile and the tests of organic abundance, type, maturity, plasma mass spectrum and U-Pb isotope age of conventional source rocks, it is found that many sets of dark-gray black coal-bearing mudstones in Lower Cretaceous developed Type I and Type III kerogen with free hydrocarbon of 0.02 ~ 0.07mg / g or zero, potential of crude oil of 0.06 ~ 0.03mg / g or zero, residual organic carbon of 1.85% ~ 1.99% or 0.70% ~ 0.84% 4 and more than 10, belong to 2 types of source rock, respectively, hydrocarbon generation and carbon dioxide gas. It is generally believed that the Cretaceous in the South Yellow Sea Basin has certain resource prospects and deserves in-depth analysis.