合水地区Z240井区长71亚段致密储层非均质性研究

Study on the Heterogeneity of Chang 71 Tight Reservoir in Well Z240 Area of Heshui Area

面对合水地区Z240井区长71亚段致密储层油气产能低、层间矛盾突出的现状,对其储层非均质性特征进行研究。从宏观角度来看,层内非均质性主要受不同类型重力流沉积砂体、夹层发育特征的影响,层间非均质性与隔层发育程度密切相关,平面非均质性受深水沉积环境、横向砂体连通性及渗透率平面分布特征的影响,长713储层非均质性最强。从微观角度来看,长71亚段致密储层发育多类填隙物且含量较高,孔喉大小分布不均、差异性显著,以纳米级孔喉为主,整体上非均质性较强。

According to the current situation of low oil and gas production capacity and significant contradictions between reservoirs in the Z240 well area of Heshui area,the heterogeneity characteristics of the Chang71 tight reservoir are studied.From a macro point of view,the intralayer heterogeneity is mainly affected by the development characteristics of different types of gravity flow sedimentary sand bodies and interlayers,and the interlayer heterogeneity is closely related to the development degree of interlayer.The planar heterogeneity is influenced by the deep-water sedimentary environment,horizontal sand body connectivity and the planar distribution characteristics of porosity.The 713 reservoir has the strongest heterogeneity.From the microscopic point of view,Chang 71 tight reservoir develops many types of interstitial materials with high content,uneven distribution of pore-throat size and significant difference,mainly nanometer pore-throat,and its heterogeneity is strong on the whole.