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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。
The Lower Second Devonian Beigou - Zhangcha junction zone 2 is the main pay zone in this area. The analysis of reservoir petrology, pore-throat structure, seepage characteristics, clay minerals, diagenesis and sensitivity evaluation by means of scanning electron microscopy, flake and mercury intrusion analysis shows that the composition of reservoir is low in maturity, Low maturity and high interstitial content. The reservoir space is dominated by primary intergranular pores with low oil displacement efficiency. There are oil-water features in the low permeability oilfield. The clay minerals in the reservoirs are mainly chlorite, diagenesis It has a great influence on the physical properties of the reservoir, and the reservoir has medium acid sensitivity and medium weak water sensitivity.