济阳坳陷滩海地区古近系构造样式及其控藏作用

Paleogene tectonic styles and their controls on hydrocarbon accumulation in the shallow sea of the Jiyang Depression

在对济阳坳陷东部滩海地区边界断层发育特征及其对古近系油气成藏控制作用研究的基础上,将该构造带划分为单断-低凸型、双断-中凸型和多断-高凸型3种类型潜山披覆构造带。单断-低凸型潜山披覆构造带古近系储盖组合最好,各个层系都有可能形成好的储盖组合,发育岩性、构造、地层和复合圈闭类型。双断-中凸型潜山披覆构造带沙三段下亚段—东营组下部发育岩性和地层超覆圈闭,东营组中上部以披覆和岩性-构造圈闭为主。多断-高凸型潜山披覆构造带以多层系地层超覆圈闭为主,整体储盖组合条件差。垦东凸起沙三段地层油藏、长堤凸起东营组岩性油藏、埕岛凸起东营组岩性油藏将会成为下步研究区重点勘探目标。

Based on the research of the development of boundary faults and their controls of hydrocaronon accumulation in the shallow sea of the eastern part of Jiyang Depression,the tectonic zone of buried hill draped structural belts was divided into three types:single fault-low uplift,double faults-middle uplift and multiple faults-high uplift. The reservoir-seal assemblages in the single fault-low uplift of the buried hill draped structural belts are the best,and good assemblages can occur in each layer. There are different trap types such as lithology trap,structural trap,stratigraphic trap and composite trap.The lithology traps and stratigraphic overlapping traps developed in the lower of the third member of Shahejie Formation and the lower of Dongying Formation in the double faults-middle uplift of the buried hill draped structural belts,and the drape trap and the lithology-structural trap developed in the middle and upper of Dongying Formation. The stratigraphic overlapping traps mainly developed in the multiple faults-high uplift of the buried hill draped structural belts,and the reservoir-seal assemblages generally have poor condition for hydrocarbon accumulation. The next exploration targets are Es3 stratigraphic oil reservoir in Kendong Uplift,Ed lithology oil reservoir in Changdi Uplift and Chengdao Uplift.