A区块二类油层与主力油层孔隙结构差异  

The Differences of Pore Structure between Second-class Reservoirs and Major Reservoirs in A Block

作　　者：夏惠芬[1] 吴笛[1] 马文国[1] 冯海潮[1] 

机构地区：[1]东北石油大学提高油气采收率教育部重点实验室,大庆163318

出　　处：《科学技术与工程》2013年第4期1006-1010,共5页Science Technology and Engineering

基　　金：国家科技重大专项(No.2009ZX05009-004-01)项目;国家自然科学基金项目(50874023)资助

摘　　要：针对A区块的实际情况,通过压汞数据得出的毛管压力曲线。分析了表征二类油层与主力油层孔隙结构特征的各项参数。研究了不同孔隙半径区间的孔隙体积、孔喉比及渗透率贡献分布特点。给出了二类油层与主力油层孔隙结构的差异。研究结果表明,与主力油层相比,二类油层除具有低孔低渗的特点之外,其它主要差异为:平均孔隙半径较小、中值压力较大、60%以上的孔隙体积分布在小孔道中;孔喉比为4.8—64.8,是主力油层孔喉比的4倍以上,最大达20倍以上,孔喉分布不均匀。According to actual situation of a block, by the capillary pressure curve which is obtained from the mercury penetration data, the pore structure characteristics parameters of second-class reservoirs and major reser- voirs are analyzed and the pore volume, pore-throat ratio and permeability contribution distribution of different pore radius interval are studied. The differences of pore structure between second-class reservoirs and major reservoirs in a block are given. The result shows that, compared with the major reservoirs, besides the characteristics of low po- rosity and low permeability the second-class reservoirs have the other characteristics. The average pore radius is smaller, the median pressure is high, more than 60% of the second-class reservoirs pore volume distributes in small pore channel, the pore-throat ratio is 4. 8 to 64.8, which is more than four times of the major reservoirs, up to 20 times. The pore throat distribution is uneven.

关 键 词：孔隙结构 二类油层 主力油层 孔喉比 

分 类 号：TE122.113[石油与天然气工程—油气勘探]