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储层的敏感性是影响储层物性参数的重要因素。本文在分析店坪北油区储层岩性特征、孔隙结构和物性特征的基础上,开展了储层的敏感性评价研究。结果表明,店坪北油区长4+5、长6储层物性差,具有低孔、特低渗的特征,岩石类型为中—细粒长石砂岩和细粒长石砂岩,其孔隙组合多为粒间孔—溶孔组合型。储层敏感性评价分析得出该油区储层在速敏性、水敏性、碱敏性三个方面都呈现出弱—中等偏弱的敏感程度,而酸敏性呈现强—中等偏强敏感程度,因此对于注水开发不会造成很大的影响,但酸敏会是该油区储层损害的主要因素,同时较强的应力敏感性应考虑在注水开发过程中注水压力对储层的伤害。
Reservoir sensitivity is an important factor affecting reservoir physical properties. Based on the analysis of reservoir lithology, pore structure and physical properties of Dianping Beiyou reservoir, the sensitivity evaluation of reservoir is carried out. The results show that the Chang 4 + 5 and Chang 6 reservoirs in Beiping Youdi area have poor physical properties and low porosity and low permeability. The rock types are medium-fine feldspar sandstone and fine feldspar sandstone, Most of the intergranular pore - dissolved pore combination type. The analysis of reservoir sensitivity shows that the reservoirs in this oil zone are sensitive to weak-moderate weakness in three aspects of speed sensitivity, water sensitivity and alkali sensitivity, while the acid sensitivity shows strong to moderate strength Therefore, it is not sensitive to the development of waterflooding, but acid sensitivity will be the main factor of reservoir damage in the oil zone. Meanwhile, the strong stress sensitivity should consider the influence of water injection pressure on the reservoir hurt.