Abstract: High yielding basement oil pools occur on the projected parts in the interior and the periphery of the Jiyang depression. The reservoir rocks consist primarily of Ordovician carbonate rocks, associated with oolitic limestones of Mid-Cambrian, quartz-sandstones of Carboniferous and Fermean and feldspathic sandstones of the Mesozoic group with lamprophyric intrusives.The reservoirs are characterized by secondary porcsity, with pores, caverns and fractures resulted from and modified by solution, reerystallization and dolomitization. The porosity distribution is related to the basement faults, the lithofacies of the reservoirs and the weathering and leached zone. The periphery of the oil generation depression and the projected parts in its interior, as well as the basement faults connected with the depression are favourable targets for oil exploration, while sections composed of pure dolomites, secondary crystalline limestones and basic intrusives are rot to be neglected In exploration, particular attention should be paid to the search and identification of related index minerals such as lerrit-calcite dikes etc., as well as Huorinization, baritization and dissolution.

摘要： 济阳坳陷的内部及周边的凸起上有高产的基岩油藏。构成储层的岩性以奥陶系碳酸盐岩为主,并有中寒武统粒灰岩,石炭二迭系石英砂岩、中生界长石砂岩及侵入其中的煌斑岩。基岩储层的储集空间都是次生的,孔、洞、缝均有。次生孔隙主要有粒间溶孔、粒内溶孔、膏模孔、方解石及白云石的晶模孔及晶溶孔等。其分布与早第三纪生油期前基本结束活动的基岩断裂发育带、储集岩的岩性岩相及古风化淋滤带有关。含油次生孔隙主要不全是古风化时期表生淋滤形成的,部分是早第三纪深层溶蚀作用形成的。生油凹陷的周边和内部的基岩凸起以及与生油凹陷连通的、在生油期前基本结束活动的基岩断裂带附近,都是勘探基岩油藏的有利地带,下古生界各种结构类型的纯白云岩,各种次生结晶灰岩及基性侵入岩分布的层段,都应列入勘探的对象。在勘探中,要注意寻找和鉴别与基岩油藏形成有关的岩矿标志。如富铁方解石脉及亮晶铁方解石胶结物、萤石化、天青石化、重晶石化及溶蚀现象等。

关键词: 次生孔隙, 济阳坳陷, 基岩断裂, 白云岩, 油藏形成, 储集空间, 中奥陶统, 煌斑岩, 方解石脉, 古风化壳