东北石油大学学报2018，Vol.42Issue(6)：41-51,103,前插3-前插4,14.DOI:10.3969/j.issn.2095-4107.2018.06.005
致密砂岩储集空间全孔喉直径表征及其意义——以松辽盆地龙虎泡油田龙26外扩区为例
Overall pore characterization of tight sandstone reservoir space and its significance:a case study of the outer expansion area of Long 26 in Longhupao oilfield, Songliao basin
摘要
Abstract
The pore size distribution is a key parameter for reservoir grading evaluation and estimation of production capacity.The complexity of the pore-throat structure of tight sandstone reservoirs has made it impossible for any single experiment to accurately quantify its pore size distribution.Scanning electron microscopy (SEM), rate-controlled mercury (RCP), mercury intrusion porosimetry (MIP) and nitrogen gas adsorption (N2GA) were conducted synthetically on tight sandstones reservoir from the Ⅱ-Ⅲ sections of the Qingshankou formation of the upper Cretaceous in the Long 26 outer expansion area of the Longhupao oilfield in the Songliao basin to characterize the reservoir space types and microscopic overall pore size distribution qualitatively and quantitatively.The results show that the tight reservoirs in the study area have poor physical properties and are low-porosity/ultra-low porosity-ultra-low permeability tight sandstone reservoirs.The pore types are residual intergranular pores, feldspar and calcite dissolution pores, intercrystalline micropores and a small number of micro-cracks.In addition to compaction, calcite cementation and the filling of primary intergranular pores with clay minerals are important causes of poor physical properties.Splicing points for the pore size distribution jointly characterized by RCP, MIP and N2GA were accurately determined.It was determined that RCP was used to characterize pore throats larger than 230 nm in diameter, MIP was used to characterize pore throats with diameters between 20 nm and 230 nm, N2GA was used to characterize pore throats with diameters less than 20 nm.The pore throat diameter distribution of tight sandstone reservoirs in the study area ranges from 2 to 600 nm.The pore throat diameter distribution of tight sandstone reservoirs in the study area ranges from 2 to 600 nm.The main distribution range is from 100 nm to 400 nm, with a very small number of pores with a diameter of 200 to 600μm.It is a thght reservoir of classⅡ-Ⅲ.Small pore throat has little effect on the permeability of tight reservoirs, but the contribution to the reservoir ability of tight reservoirs cannot be ignored.The results of this study provide a reference for the prediction of high quality reservoirs in oil fields.关键词
孔喉结构/全孔喉直径表征/致密砂岩/高台子/龙26外扩区/龙虎泡油田/松辽盆地Key words
pore throat structure/overall pore characterization/tight sandstone/Gaotaizi/extension area of Long 26/Longhupao oilfield/Songliao basin分类
能源科技引用本文复制引用
刘薇,卢双舫,王民,张世祥,刘洋,周能武,关莹,王海龙..致密砂岩储集空间全孔喉直径表征及其意义——以松辽盆地龙虎泡油田龙26外扩区为例[J].东北石油大学学报,2018,42(6):41-51,103,前插3-前插4,14.基金项目
国家自然科学基金项目 (41672116) （41672116）
国家科技重大专项 (2016ZX05046-001-005) （2016ZX05046-001-005）
教育部中央高校自主创新科研计划项目 (17CX05012) （17CX05012）
