英东油田油砂山组储层特征研究及分类评价

Reservoir Characters and Classification Evaluation of Youshashan Formation in Yingdong Oilfield

应用沉积岩石学方法,利用岩心、铸体薄片、扫描电镜等分析化验资料,通过岩石粒度、岩石结构组分、胶结物含量、成岩作用等分析,对英东油田油砂山组(N22—N21)储层特征进行研究,认为油砂山组储层具有结构成熟度中等—高、碎屑颗粒粒度较细、杂基含量相对较低、胶结物含量中等、成岩作用整体较弱等特征。根据其岩石学特征、成岩作用、孔隙结构及储层分布特征等多种参数,对储层进行分类评价,Ⅰ类储层为优质储层,主要分布于构造高点,可获高产油气流;Ⅱ类储层为较优质储层,主要分布于构造主体的边缘部位,可获工业油气流;Ⅲ类储层为相对较差储层,主要在构造主体部位及东构造的边缘部位,储集性能较差。研究成果可指导英东油田下步开发。

We applied the method of sedimentary petrology and used such data as core, casting thin section, scanning eletron microscope to analyze the reservoir characters of Youshashan Formation （N2^2-N2^1） in Yingdong Oilfield by means of rock granularity, rock constituent, cement content, and diagenesis, etc. Reservoir in the Formation features in mediumhigh structural maturity, fine granularity of elastic particles, lower content of matrix, medium content of cement, and generally weak diagenesis. According to petrology characters, diagenesis, pore structure, reservoir distribution features and other parameters, we conducted classification evaluation on the reservoir. Type Ⅰ reservoir has high quality, which is mainly distributed in high points of the structure and could obtain high-production oil and gas flow. Type Ⅱ reservoir has relatively high quality, which is mainly distributed in the peripheral parts of main structure. Type Ⅲ reservoir has relatively poor quality, which is mainly distributed in main structure and peripheral parts of eastern structure and has poor reservoiring capacity. The research result could guide development in Yingdong Oilfield in the future.