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

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.