下寺湾油田北沟-张岔结合区长2油藏储层特征研究

Reservoir Characteristics of Chang 2 Reservoir of Beigou-Zhangcha Area in Xiasiwan Oil Field

下寺湾油田北沟-张岔结合区长2油层为该区主力产层。通过扫描电镜、薄片和压汞分析等方式对研究区储层岩石学、孔喉结构、渗流特征、粘土矿物、成岩作用及敏感性评价进行了分析,研究表明,储集层成分成熟度低、结构成熟度低,填隙物含量高;储集空间以原生粒间孔为主,驱油效率低;有低渗油田油水同出特点;储层粘土矿物主要以绿泥石为主,成岩作用对储层物性影响较大,储层具中等酸敏,中等偏弱水敏特点。

Chang 2 reservoir of Beigou-Zhangcha area is main producing layer.Reservoir petrology,pore structure,flow characteristics,clay mineral,rock effect and sensitivity evaluation were analyzed and studied by scanning electron microscope,sheet and mercury penetration analysis.The results show that the reservoir has characteristics of low compositional maturity,low structure maturity,high content of filler,main original interparticle pores as reservoir space,low oil displacement efficiency,oil-water flowing of low permeability oil field,chlorite as reservoir clay minerals,obvious rock impact on reservoir and medium acid sensitivity,medium to weak water sensitivity.