埕岛油田的勘探现状及下步勘探方向

Exploration Status and Next Prospecting Direction of Chengdao Oilfield

邹东波 冯德永 徐梅 刘刚

ZOU Dong-bo FENG De-yong XU Mei LIU Gang

胜利油田物探研究院, 山东东营 257100

Geophysical Research Institute of Shengli Oilfield Company Limited, Dongying 257100, China

埕岛油田是在我国东部浅海海域发现的第一个整装油气田,已发现了太古界、下古生界、上古生界、中生界、古近系沙河街组、东营组、新近系馆陶组、明化镇组等八套含油气层系,为一典型的复式油气聚集区。文章总结了埕岛油田的勘探历程;研究了勘探现状。埕岛油田具有新近系披覆、古近系超覆和前第三系潜山三层构造。新近系披覆层已发现了新近系的岩性-构造油气藏、岩性油气藏,具有丰度高、储量大、油藏埋藏浅、易于勘探开发的特点,是主力含油层系,勘探程度较高;古近系的断块、断鼻、滚动背斜油气藏、地层超覆油气藏、岩性油气藏;前第三系的断块山油气藏、残丘山油气藏、地层不整合油气藏等则具有油质好、产能高等特点,勘探程度较低。根据目前的勘探现状及地质认识,对埕岛油田下步的勘探方向进行了探索,认为下步应加大桩海地区古近系及前第三系、埕北凹陷周围古近系、新近系的勘探力度。

Chengdao Oilfield is the first equipped oil field found at shallow sea in the east of China, in which eight oil-bearing formations were found such as Archean group, lower Paleozoic, upper Paleozoic, Mesozoic group, Paleogene Shahejie group, Dongying group, Neogene Guantao group, and Minghuazhen group, showing a typical compound accumulation area of oil and gas. In the paper, the exploration history of Chengdao Oilfield is analyzed and the exploration status is studied. The structures of Chengdao Oilfield consist of drape in Neogene, overlap in Paleogene and buried hill in Pre-Tertiary. Lithologic- structural reservoir and lithologic reservoir found in drape of Neogene, which is characterized by high abundance, rich reserves, shallow buried reservoir and easy for exploration, is a main oil-bearing series. Although the quality of oil is good, reservoir of fault, faulted nose and roll anticline in Paleogene, reservoir of formation overlap, lithologic reservoir, faulted block reservoir in Pre-Tertiary, residual hill reservoir and reservoir of formation unconformity can not be explored well. According to the exploration status and geological study, the next exploration target of Chengdao Oilfield is discussed. Paleogene and Pre-Tertiary of Zhuanghai area, Paleogene and Neogene around depression of Chengbei are the next exploration targets.