低渗透砂砾岩储层孔隙结构特征及微观剩余油分布研究
发布时间：2018-09-11 17:09
【摘要】：低渗透储层是目前新区产能建设和油田上产的主体,而其中包含着大量砂砾岩储层。长期的勘探开发实践表明,低渗透砂砾岩储层中微观剩余油分布与孔隙结构密切相关,且孔隙结构上的差别往往能在宏观上决定油藏产能和开发效果,因此,在对孔隙结构特征进行深入研究的基础上,分析微观剩余油分布规律,对经济有效地开发好低渗透砂砾岩油藏具有重要意义。论文以玛北及其外围地区百口泉组低渗透砂砾岩储层为例。利用铸体薄片观察及扫描电镜技术,分析孔隙与喉道的类型、大小、分布特征以及相互组合关系,并根据常规压汞资料分析各孔隙结构参数及毛细管压力曲线的特征。最终确定孔隙度、渗透率、排驱压力、最大孔喉半径、平均孔喉半径和分选系数作为分类依据,并结合孔隙类型以及毛细管压力曲线特征,将低渗透砂砾岩储层孔隙结构划分为Ⅰ型、Ⅱ型和Ⅲ型三类,其中Ⅰ型孔隙结构少见,Ⅱ型和Ⅲ型孔隙结构发育。选取具Ⅱ型和Ⅲ型孔隙结构的岩样,开展柱状岩心驱替实验,并与核磁共振测试及含油薄片荧光分析技术相结合,总结Ⅱ型和Ⅲ型孔隙结构内微观剩余油的分布规律。实验结果表明,Ⅱ型孔隙结构的中-大孔隙内基本无剩余油富集,绝大部分剩余油以孔内半充填型和分散油滴型分布在小孔隙区间内,而微孔隙网络多为“死油区”,发育孔喉充填型和孔内半充填型剩余油,此外,Ⅱ型孔隙结构中还存在少量裂缝滞留型剩余油以及相对较高比例的喉道滞留型和角隅型剩余油;Ⅲ型孔隙结构内剩余油也主要分布在小孔隙区间内,但中-大孔隙内仍有孔喉充填型或孔内半充填型剩余油富集,且相对于Ⅱ型孔隙结构,喉道滞留型、角隅型和分散油滴型剩余油含量较低。
[Abstract]:Low permeability reservoir is the main part of productivity construction and oil field production in the new area at present, and it contains a lot of sand and gravel reservoir. The long-term exploration and development practice shows that the micro-residual oil distribution in low-permeability sandy gravel reservoir is closely related to pore structure, and the difference in pore structure often determines reservoir productivity and development effect in macro level. On the basis of the deep study of pore structure characteristics, it is of great significance to analyze the distribution law of micro residual oil for the economic and effective development of low permeability sandy gravel reservoir. This paper takes the low permeability sandy gravel reservoir of Baikouquan formation in Mabei and its periphery as an example. The type, size, distribution and relationship of pore and throat were analyzed by means of casting thin slice observation and scanning electron microscope. The pore structure parameters and capillary pressure curve were analyzed according to conventional mercury injection data. Finally, porosity, permeability, displacement pressure, maximum pore throat radius, mean pore throat radius and sorting coefficient are determined as the classification basis, and combined with pore type and capillary pressure curve characteristics, The pore structure of low permeability sandy gravel reservoir is divided into three types: type 鈪，
本文编号：2237320
[Abstract]:Low permeability reservoir is the main part of productivity construction and oil field production in the new area at present, and it contains a lot of sand and gravel reservoir. The long-term exploration and development practice shows that the micro-residual oil distribution in low-permeability sandy gravel reservoir is closely related to pore structure, and the difference in pore structure often determines reservoir productivity and development effect in macro level. On the basis of the deep study of pore structure characteristics, it is of great significance to analyze the distribution law of micro residual oil for the economic and effective development of low permeability sandy gravel reservoir. This paper takes the low permeability sandy gravel reservoir of Baikouquan formation in Mabei and its periphery as an example. The type, size, distribution and relationship of pore and throat were analyzed by means of casting thin slice observation and scanning electron microscope. The pore structure parameters and capillary pressure curve were analyzed according to conventional mercury injection data. Finally, porosity, permeability, displacement pressure, maximum pore throat radius, mean pore throat radius and sorting coefficient are determined as the classification basis, and combined with pore type and capillary pressure curve characteristics, The pore structure of low permeability sandy gravel reservoir is divided into three types: type 鈪，
本文编号：2237320
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