安塞油田低渗透储层岩石物性特征实验研究

Experimental study on petrophysical property of low permeability reservoir of Ansai oil field.

方法通过实验对安塞油田低渗透储层岩石物性特征进行研究。目的了解低渗透储层在物性和孔隙结构等方面的特点，进而分析低渗透储层对物性测量、渗流能力的影响。结果低渗透岩心物性对上覆压力有一定的敏感性，而且孔隙度与渗透率间不存在线性关系，因此在物性测量、储层评价及开发过程中要考虑这一因素带来的影响。结论安塞油田低渗透岩心存在多种孔喉体系，孔隙间片状喉道较发育；而岩心中的微裂缝在储存能力上不起主导作用，但在一定条件下可改善低渗透储层的渗流能力；

MethodPetrophysical properties of low permeability reservoir of Ansai oil field are studied through experiment. PurposeTo understand the characteristics of petrophysical property and pore structure of low permeability reservoir and to analyze the influence of low permeability reservoir on petrophysical parameter measurement and percolation ability. ResultPetrophysical properties of low permeability core is sensitive to its overburden pressure and no linear relationship exists between porosity and permeability. Therefore, consideration should be given in the process of petrophysical parameter measurement, reservoir evaluation and devlopment. ConclusionMany pore throat systems exist in the low permeability pores of Ansai oil field with well developed sheet throat. The micro fracture in the core is not important to storing capacity, however, it can improve the percolation ability of low permeability reservoir under certain circumstances. Fracturing and water injection in early stage can improve development effect.