摘要
综合利用岩心、岩石薄片、恒速压汞测试及扫描电镜等资料,对松辽盆地大安地区扶余油层致密砂岩油的储集层特征、含油特征及其主控因素进行了研究。大安地区扶余油层含油特征表现为:1大面积(准)连续分布,局部"甜点"富集;2含油丰度低,致密油分布极其复杂;3含油级别以油浸—油斑为主,含油物性下限极低;4油水分异差,无统一油水界面。以上含油特征主要受控于研究区分流河道砂体的空间分布、储集层物性差异、孔喉结构及大小。分流河道砂体分布的边界即为致密砂岩油分布的外边界,致密砂岩油分布的非均质性受控于单期分流河道砂体及多期(或多支)分流河道砂体间的接触关系;物性差异控制了"甜点"的分布,进而控制了致密砂岩油的富集;孔喉结构及其大小控制致密砂岩油的油水分异程度,纳米级喉道系统控制了石油滞留成藏。
By using core samples, thin section, scanning electron microscope and rate-controlled mercury penetration data etc, the reservoir characteristics, oil-bearing characteristics and main controlling factors of the tight sandstone oil in Fuyu oil layer of Da＇an area, Songliao Basin are studied. The oil-bearing characteristics of Fuyu oil layers in Da＇an area are as follows： （1） the extensive and continuous distribution, with ＂sweet spots＂ in local areas; （2） low oil abundance, and very complex distribution; （3） oil-bearing grade being oil immersion to oil spot, with very low lower-limit of oil-bearing porosity and permeability; and （4） poor differentiation of oil and water, no uniform oil-water contact. The above oil-beating characteristics of the tight sandstone in Fuyu oil layers are mainly controlled by the spatial distribution of distributary channel sands, the differences in reservoir physical properties, the structure and size of pores and throats. The boundary of distributary channel sandbody is the boundary of tight sandstone oil distribution. The heterogeneity of tight sandstone oil is controlled by the single distributary channel sandbody and the contact relationship between different stages of distributary channel sandbody. Distribution of ＂sweet spots＂ and enrichment of tight sandstone oil are controlled by the differences in physical properties. The differentiation ofoil and water in the tight sandstone is controlled by the pore structure and pore size. In-situ oil accumulation is controlled by the nano-pore throat structure system.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期589-597,共9页
Petroleum Exploration and Development
基金
西南石油大学油气藏地质及开发工程国家重点实验室资助项目(PLN1305)
国家高新技术研究发展计划(863)项目(2013AA064903)
国家自然科学基金(41202102)
中国博士后科学基金(2014M551212)
关键词
致密砂岩油
储集层特征
致密油分布
含油性
扶余油层
松辽盆地
tight sandstone oil
reservoir characteristics
tight oil distribution
oil-bearing characteristics
Fuyu oil layer
Songliao Basin
