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济阳坳陷不整合的发育过程大体可分为风化期、剥蚀期和成岩期3个阶段。风化期是不整合结构形成的基础,剥蚀期是不整合结构得以保存的关键时期,成岩期决定着不整合结构的矿物成分及孔渗结构。由于不整合形成的长期性和复杂性,不整合结构的发育主要受沉积间断时间、风化母岩岩性、保存条件和古气候4种因素的控制,结合不整合结构的发育过程和控制因素的分析,将济阳坳陷不整合划分为凸起—陡坡基岩强风化型、缓坡基岩强风化型和古近系—新近系内部母岩弱风化型3种发育模式。凸起—陡坡带不整合面下岩石孔渗性较好,一般形成潜山油气藏;缓坡带一般形成结构比较完整的不整合,易形成不整合超覆和遮挡油气藏;古近系—新近系内部地层不整合风化时间短、程度弱,可作为油气运移的通道。
The developmental process of unconformity in Jiyang Depression can be divided into three stages: weathering, denudation and diagenesis. The weathering period is the basis for the formation of the unconformity structure. The denudation period is the key period for the unconformity structure to be preserved. The diagenesis period determines the mineral composition and pore infiltration structure of the unconformity structure. Due to the long-term and complex formation of unconformity, the development of unconformity structure is mainly controlled by four factors of sedimentary discontinuity time, weathering mother rock lithology, preservation conditions and paleoclimate, combined with the development process and controlling factors of unconformity Based on the analysis, the unconformities of Jiyang Depression can be divided into three types of development patterns: strong weathered type of bulge-steep slope rock, strong weathered type of bedrock rock and weak weathering type of Paleogene-Neocene parent rock. In the convex-steep slope unconformity, the permeability of rocks is good, generally forming buried hill reservoirs; the gentle slope belt generally forms unconformity with complete structure, easy to form unconformity overrun and block oil and gas reservoir; Paleogene - Department of internal strata unconformity weathered a short time, a weak degree, can be used as a channel for oil and gas migration.