HYDROCARBON EXPLORATION POTENTIAL ANALYSIS OF THE LOWER MARINE FORMATION ASSEMBLAGE IN THE LOWER YANGTZE REGION
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摘要: 通过对下扬子地区"海相下组合"构造背景、生储盖发育、演化、保存以及典型实例的剖析,认为下扬子盆地北部中新生代叠置区"海相下组合"烃源岩具备长期生烃、多期次生烃的条件,同时该地区志留系高家边组大套海相泥页岩构成良好的油气封盖层。进一步研究认为,下扬子地区是印支期拼合到欧亚大陆的古板块,古板块的主体部分是历次构造运动的相对稳定区,即下扬子中央稳定带,此中央稳定带位于盐城—南黄海一带的广大区域,是下扬子区"海相下组合"油气勘探的有利区。Abstract: Based on the analysis of the tectonic setting,source-reservoir-caprock development,evolution and preservation as well as some typical examples of the Lower Marine Assemblage,it is considered that the source rock in the Lower Marine Formation Assemblage in the Meso-Cenozoic superposted area in the north of Lower Yangtze basin is characterized by long-term and multiperiodic hydrocarbon-generating.Moreover,the Silurian Gaojiabian Formation being composed of thick marine mud shale is a good caprock.Further research shows that the Lower Yangtze area is a fossil plate spliced to the Eurasia in Indo-Chinese epoch.The main body of the fossil plate is a relatively steady zone called Lower Yangtze central steady zone.This central steady zone is situated in Yancheng to South Yellow Sea region.It is a potential exploration area in the Lower Marine Formation Assemblage in Lower Yangtze region.
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