基于氮吸附和压汞数据确定致密储层孔径分布 ——以松辽盆地大安油田扶余油层为例-《深圳大学学报理工版》

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Title:: The confirmation of micro-aperture distribution of tight reservoir base on the data of pressing mercury-nitrogen adsorption— an example from Fuyu oil layer in Da’an oilfield of Songliao basin

作者:: 张云峰1; 2; 臧起彪1; 2; 孙博1; 2; 姜美玲1; 2; 王朦朦1; 2; 闫明3; 1)东北石油大学地球科学学院，黑龙江大庆 163318；2) 东北石油大学黑龙江省油气藏形成机理与资源评价重点实验室，黑龙江大庆 163318；3）大庆油田有限责任公司第三采油厂，黑龙江大庆 163113

Author(s):: ZHANG Yunfeng1; 2; ZANG Qibiao1; 2; SUN Bo1; 2; JIANG Meiling1; 2; WANG Mengmeng1; 2; and YAN Ming3; 1) College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang Province, P.R.China 2) Heilongjiang Oil and Gas Reservoir Forming Mechanism and Resource Evaluation Key Laboratory, Northeast Petroleum University, Daqing 163318, Heilongjiang Province, P.R.China 3) No.3 Oil Production Plant of Daqing Oilfield Company Co. Ltd., Daqing 163113, Heilongjiang Province, P.R.China

Keywords:: reservoir evaluation; nitrogen adsorption method; mercury intrusion method; prior probability; tight reservoir; effective integration; aperture distribution

摘要:: 为实现对致密砂岩储层孔隙结构特征的整体分析，以松辽盆地大安油田扶余油层的致密砂岩样品为研究对象，利用先验概率比值合并的数学方法，将氮吸附和压汞法观察到的不同尺度的孔喉分布参数进行有效整合，实现从整体上对致密砂岩储层孔喉分布特征的准确把握，为客观合理进行致密储层综合研究与评价打下基础．研究结果表明，利用先验概率比值合并的数学方法，可有效地将氮吸附法和压汞法观察到的孔径范围进行整合；氮吸附法仅能测得小于63.000 nm的孔喉，压汞法仅能测得大于6.300 nm的孔喉．根据整合分析结果，由样品的整体孔喉分布特征可知，S87号样品的孔喉主要分布在25.000～400.000 nm，S105号样品的孔喉主要分布在10.000～400.000 nm；致密砂岩中，储层孔隙度相同时，渗透率越大，其大孔喉的含量越高．

Abstract:: In order to realize the integral analysis of pore structure characteristics of tight sandstone reservoir, this article take the tight sandstone sample that comes from Fuyu reservoir in Da’an oilfield of Songliao basin as object of the research, the pore-throat distribution parameters observed by nitrogen adsorption and pressing mercury method are integrated effectively by using the mathematical method of prior-probability ratio to accurately grasp the characteristics of pore-throat distribution of tight sandstone reservoir and to lay a foundation for the comprehensive study and evaluate the tight reservoirs objectively and rationally. The results show that the pore-throat distributions which are observed by the nitrogen adsorption method and the mercury injection method can be effectively integrated by the mathematical method of the prior-probability ratio, and the nitrogen adsorption method can only measure the pore-throat that is less than 63.000 nm in diameter, and the pressing mercury method can only measure the pore-throat that is more than 6.300 nm in diameter, and the diameter of the pore-throat of S87 sample is mainly distributed between 25.000 nm and 400.000 nm, and that of S105 sample is mainly distributed between 10.000 nm and 400.000 nm,and in tight sandstone. When the reservoir’s porosity is constant,the greater the permeability of reservoir, the higher the content of the large pore- throat.