斜坡带油气成藏特征与勘探方法——以济阳坳陷为例

Pool-forming Features and Exploration Methods for Oil and Gas in Slope Zone

秦永霞 姜素华 王永诗

QIN Yong-xia JIANG Su-hua WANG Yong-shi

胜利石油管理局 地质科学研究院, 山东 东营 257015

Geology Science Research Institute of Shengli Oil Field Limited Company, Dongying 257015, China

以济阳坳陷为例,概要论述了箕状断陷的结构特征,把斜坡带分为宽缓型、窄陡型、双元型三种类型,研究了不同类型斜坡带油气藏类型、油气控制因素及分布规律,指出在宽缓斜坡带主要以形成上第三系构造-岩性油藏、下第三系岩性油气藏、地层超覆不整合油藏、构造-地层油气藏及前第三系的地层剥蚀不整合油藏为特征;窄陡斜坡带主要形成断块油藏、断块-岩性油藏、滚动背斜油藏;双元斜坡带主要形成潜山油藏、地层不整合油藏及断块-岩性油气藏。在此基础上,建立了以综合地质分析为基础,以高分辨率层序地层学、测井约束反演、三维可视化技术等为手段的斜坡带综合勘探方法,提高了斜坡带的勘探效果,也为类似盆地斜坡带的勘探提供了成功的经验。

This paper presents briefly the structure features of half-graben depression in Jiyang and divides the slope belt into three types, i.e, wide-gentle, narrow-abrupt and double-structure slope zones. By analyzing the types of hydrocarbon reservoir, the factors controlling hydrocarbon distribution and rules of it, we suggest that the wide-gentle slope belt develops the upper tertiary structural-lithologic reservoir, lower tertiary lithologic reservoir, stratigraphic onlap unconformity reservoir, structural-stratigraphic reservoir and pre-tertiary unconformity reservoir of stratigraphic degradation, the narrow-abrupt slope zone develops fault block oil reservoir, fault block-stratigraphic oil reservoir and rolling anticlinal oil reservoir and the double-structure slope belt develops buried hill oil reservoir, stratigraphic unconformity oil reservoir and fault block-lithologic hydrocarbon reservoir. Based on the above, we can explore them by means of integrated geologic analysis, high resolution sequence stratigraphy and log constrained inversion and 3D-visualization comprehensively. It is very efficient exploration of slope zones and will provide some experience for exploration on slope zones of the similar basin.