论文部分内容阅读
近年来东营凹陷的油气勘探结果表明该凹陷仍有巨大的勘探潜力,未发现的油气主要蕴藏于包括沙三段浊积岩性圈闭在内的隐蔽圈闭内。为了指导浊积岩性圈闭的油气勘探,重点探讨了沙三段浊流砂体的沉积模式和成藏特征。文章的独特之处在于作者建立了两个类比关系:沙三段沉积时的沉积格架与东非裂谷半地堑的现代沉积相似,沙三段3类不同的湖相浊积岩(陡坡带浊积砂砾岩扇裙、缓坡带湖底扇和凹陷带三角洲前缘浊积砂体)的沉积模式可以与表征海相沉积岩的沉积模式相类比。陡坡带浊积砂砾岩和缓坡带湖底扇浊积岩能否成藏的关键要素是上倾方向是否存在封堵条件,而控制三角洲前缘浊积砂体能否成藏的要素不是很清楚,可能有多个因素。
The results of oil and gas exploration in Dongying depression in recent years show that the depression still has great exploration potential. Unidentified hydrocarbons are mainly contained in hidden traps, including the turbidite traps in the third member of Shahejie formation. In order to guide the hydrocarbon exploration of turbidite traps, the sedimentary model and reservoir-forming characteristics of turbidite sand bodies in the third member of Shahejie Formation are discussed. The article is unique in that the author established two analogies: the sedimentary framework of the third member of the Shahejie Formation is similar to the modern sedimentation of the East African rift semi-graben. Three different types of lacustrine turbidite (the steep slope belt Turbidite conglomerate fan skirts, gentle slope sublacustrine fan and depression with delta front turbidite bodies) can be compared with the sedimentary patterns of marine sedimentary rocks. The key element of turbidite accumulation in steep slope with turbidite conglomerate and gentle-slope lake turbidite is whether the plugging conditions exist in the upwelling direction, and the factors controlling the turbidity sedimentation in the delta front are not clear, There are several factors.