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地下水文地质特征在油气藏形成与演化过程中起着重要的作用,受沉积环境及构造活动等因素的控制,不同的水文地质特征反映不同的地质环境。分析临清地区水文地质特征发现,该区沙四段地层水矿化度平均高于孔店组;前寒武系到中奥陶统地层水矿化度、水型出现明显变化;古近系地层水矿化度较低,表明该区地下水与渗入水的淡化作用有关。根据古水文地质旋回的概念,将研究区自下而上划分出6个水文地质旋回,结合构造和沉积特征分析表明,临清地区石炭系—二叠系烃源岩地层沉积前或沉积后的水文地质旋回对油气生成、运聚无影响,中生代的水文地质旋回和中生代与古近纪之间的水文地质旋回对油气的保存不利,新近纪是油气成藏的最好时期,钻井证实该期利于成藏。
The characteristics of underground hydrogeology play an important role in the formation and evolution of oil and gas reservoirs and are controlled by factors such as sedimentary environment and tectonic activity. Different hydrogeological features reflect different geological environments. Based on the analysis of hydrogeological characteristics in Linqing area, it is found that the salinity of formation water in Sha 4 reservoir is higher than that of Kongdian Formation on average. The water salinities of Precambrian to Middle Ordovician have obvious changes, and the Paleogene The low salinity of formation water indicates that the groundwater in this area is related to the desalination effect of infiltrated water. According to the concept of palaeogeomorphology, six hydrogeologic cycles are divided from bottom to top in the study area. Based on the analysis of tectonic and sedimentary characteristics, it is shown that before or after sedimentary deposition of Carboniferous-Permian hydrocarbon source rocks in Linqing area Hydrogeological cycles have no effect on the formation and migration of oil and gas. The Mesozoic hydrogeological cycles and the hydrogeological cycles between Mesozoic and Paleogene are unfavorable to oil and gas reservoirs. Neogene is the best time for hydrocarbon accumulation. Drilling confirmed that Benefit to accumulation.