胡尖山油田H154区长6_(1)储层特征及分类评价

Characteristics and classification evaluation of Chang 6_(1) reservoir in H154 area of Hujianshan Oilfield

通过岩心薄片、铸体薄片、压汞曲线等分析资料,对胡尖山油田H154区长6_(1)储层的储集岩主要类型、储集空间类型及储集岩物性特征进行了综合研究,并优选孔隙度、渗透率、有效厚度、初始含水率4种参数,采用聚类分析法对储层进行了评价。研究结果表明,胡尖山油田H154区长6_(1)储集岩类型主要为岩屑长石砂岩和长石砂岩;储集空间类型以残余粒间孔、长石溶孔为主,粒内溶孔、晶间孔以及微裂隙次之,非均质性较弱;储集岩孔隙度为10%~16%,平均值为12.9%,渗透率为0.1~1 mD,平均值为0.65 mD。研究区长6_(1)储层可划分为Ⅰ类(好)、Ⅱ类(较好)、Ⅲ类(中等)、Ⅳ类(非或差)4种类型,同级别储层相比,长6_(1)^(1)储层要优于长6_(1)^(2)储层,且二者均以Ⅲ,Ⅳ类储层为主,总体表现为低孔超低渗特征,其中长6_(1)^(1)储层主要位于工区南部,长6_(1)^(2)储层主要位于工区中部。

Based on the analysis data of core thin section,casting thin section and mercury injection curve,the main types of reservoir rocks,reservoir space types and physical properties of Chang 6_(1)reservoir in H154 area of Hujianshan Oilfield are studied comprehensively,and four parameters of porosity,permeability,effective thickness and initial water cut are optimized,and the reservoir is evaluated by cluster analysis.The results show that the main reservoir types of Chang 6_(1)in H154 area of Hujianshan Oilfield are lithic arkose and arkose;the main reservoir space types are residual intergranular pores and arkose dissolution pores,followed by intragranular dissolution pores,intergranular pores and microcracks,with weak heterogeneity;the porosity of reservoir rocks is mainly between 10%~16%,with an average value of 12.9%,and the permeability is mainly between 0.1~1 mD,with an average value of 0.65 mD.Reservoir Chang 6_(1)in the study area can be divided into four types,I(good),II(better),III(medium),IV(non or poor).Compared with the same level reservoir,reservoir Chang 6_(1)^(1)is better than reservoir Chang 6_(1)^(2),and both of them are mainly class III and IV reservoirs,with the overall characteristics of low porosity and ultra-low permeability.Reservoir Chang 6_(1)^(1)is mainly located in the south of the work area,and reservoir Chang 6_(1)^(2)is mainly located in the middle of the work area.