摘要
广安地区须家河组的储层主要分布在须六段和须四段。岩石孔隙结构特征是影响储层流体(油、气、水)储集能力、油气资源开采和储集岩渗透能力的主要因素,因此明确岩石孔隙结构特征是发挥储层产能和提高油气采收率的关键。通过对研究区取心段常规物性的分析表明,研究区内的须四段和须六段砂岩储层孔喉特征为特低孔特低渗—低孔低渗储层,非均质性极强,局部具有中孔、低渗储层分布;通过压汞实验分析孔隙结构各项参数值的变化情况,研究了该区内储层段的发育情况和储层孔喉的分布和变化;利用一元回归方法计算出孔隙度和渗透率与孔隙结构参数的相关物理方程,并以孔隙度和渗透率为中间参数作出孔隙结构指数与储层产能指数的关系图,研究表明两者有很高的负相关性。
For Xujiahe Formation in Guangan area,its reservoirs mainly include Xujiahe 6 and Xujiahe 4 members.Characteristics of rock pore structure are the key factor affecting the reservoir capability of reservoir fluid(including oil,gas andwater),the hydrocarbon production and the permeable capability of reservoir rock.As a result,to make sure the characteristics isvery essential to increase both productivity and recovery efficiency.A conventional physical-property analysis forcore-sampling interval shows that the reservoirs in this studiedarea,which is characterized by very strong heterogeneity,belong to extra low-porosity and extra low-permeability to low-porosity and low-permeability ones.And there are in part some mediumporosity and low permeability reservoirs.Parameter variation ofpore structure was analyzed by mercury-injection experiment and the development of reservoir and the distribution and variation of pore and throat were also studied.In addition,the porosity,permeability and some pore structure parameters were calculated by a univariate regression method.After that,the relation diagram between pore structure index and reservoir productivity index wasdrawn up in terms of porosity and permeability.The result indicates that there is a high negative correlation between thesetwo indexes.
出处
《天然气技术》
2008年第6期11-14,77,共4页
NATURAL GAS TECHNOLOGY
