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饶阳凹陷河间洼槽古近系沙河街组砂岩储层具有典型的低孔低渗特征,为揭示储层致密化过程,并分析其与油气成藏的关系,通过岩心观察、铸体薄片鉴定、流体包裹体分析等手段,结合地层埋藏史和热演化史模拟,分析储层成岩演化过程,同时利用“反演回剥”的原理,以铸体薄片资料为基础,定量恢复地质历史时期的储层孔隙度演化,与油气充注史相结合确定研究区砂岩储层成岩演化与成藏之间的耦合关系。结果表明,经历酸碱交替的流体演化,储层成岩演化呈多期溶解多期胶结的特征;成岩早期缺乏抗压实的碳酸盐胶结物、塑形矿物的压实作用、硅质和碳酸盐胶结作用是造成储层致密化的主要因素;储层致密化前后有2期油气充注,第1期油气充注于储层致密化之前,即油气在浮力作用下进入储层的“先成藏后致密”的过程,第2期油气充注于储层致密化之后,即油气在超压作用下进入储层的“先致密后成藏”的过程。
Sandstone reservoirs in the Shahejie Formation of the Paleogene in the Hejian depression of the Raoyang depression have the characteristics of low porosity and low permeability. In order to reveal the densification process of the reservoir and analyze the relationship with the hydrocarbon accumulation, sandstone reservoirs Identification and fluid inclusion analysis, combining with the burial history and thermal evolution history simulation of formation, the evolution process of reservoir diagenesis is analyzed. At the same time, the principle of “back-stripping” is used to quantitatively restore the geology The evolution of reservoir porosity in history and the history of hydrocarbon filling combined determine the coupling relationship between diagenetic evolution and reservoir formation of sandstone reservoirs in the study area. The results show that the diagenetic evolution of the reservoir shows the characteristics of multi-stage multi-stage cementation after experiencing acid-base alternation. In the early stage of diagenesis, there is a lack of compressive carbonate cements, compaction of plastic minerals, siliceous and carbon The cementation of the acid salt is the main factor that causes the densification of the reservoir. Before and after the densification of the reservoir, there are two periods of filling of the oil and gas. Before the first period of filling, the oil and gas are filled into the densification of the reservoir, “After the first accumulation of tight reservoir”, the second period of oil and gas filling in the densification of the reservoir, that is, the oil and gas into the reservoir under the action of overpressure “the first dense reservoir ” process.