西峰油田M20井区延长组长8_1储层特征研究

Research on the characteristics of Chang-8_1 reservoir of Triassic in Xifeng oilfield M20 borefield

依据剖面观察、岩心描述、薄片分析和压汞实验等研究方法,对西峰油田M20井区长81储层岩石学特征、储集空间类型和储层物性特征及成岩作用进行了系统的研究。结果表明,研究区长81层主要为细—中粒岩屑长石砂岩,其次为细—中粒长石岩屑砂岩。研究区储层孔隙空间主要有粒间孔、粒内溶孔、晶间孔、微孔、裂缝孔隙。储层物性较差,属于中孔—低渗型的储层。成岩作用是该区储层发育最主要的影响因素,其中成岩过程中压实作用、胶结作用、交代作用和溶解、溶蚀作用对储集空间有较大的影响。

Based on the study method of rock sections observation, core analysis, rock slice analysis and mercury penetration exper- iment, petrology characteristics, reservoir space types, reservoir physical property characteristics and diagenesis of Xifeng oilfield M20 borefield were systematically studied. The result shows that the reservoir of Chang-81 reservoir in Xifeng oilfield M20 bore- field are mainly of fine grain-mesograin lithic arkose, and there are slight show of fine grain-mesograin feldspathic litharenite. The reservoir pore space are mainly of intergranular pore, intraparticle dissolved pore, intercrystalline pore, micropore and microfrac- ture pore. The reservoir physical property is not well and characterized by medium porosity and low permeability. The diagenesis are the mainly influential factor of reservoir development, and the reservoir property mainly depends on compaction, cementation, metasomasis and solution during the diagenesis.