岩性油气藏 ›› 2022, Vol. 34 ›› Issue (3): 1528.doi: 10.12108/yxyqc.20220302
柳忠泉1, 曾治平1, 田继军2, 李艳丽1, 李万安2, 张文文2, 张治恒2
LIU Zhongquan1, ZENG Zhiping1, TIAN Jijun2, LI Yanli1, LI Wan'an2, ZHANG Wenwen2, ZHANG Zhiheng2
摘要: 通过岩石类型、矿物组分、物性特征、沉积环境及成岩作用等资料,对吉木萨尔凹陷二叠系芦草沟组页岩油“甜点”成因与空间分布进行了研究。研究结果表明:①研究区上“甜点”主要为砂质白云岩、泥质白云岩及白云质粉砂岩,下“甜点”主要为泥质白云岩、白云质粉砂岩、粉砂岩及白云质泥岩;上“甜点”平均孔隙度为9.4%,平均渗透率为0.0637mD,下“甜点”平均孔隙度为9.3%,平均渗透率为0.0231mD,均属于中低孔、特低渗储层。②研究区“甜点”储层主要孔隙类型为粒内溶孔和粒间溶孔,上、下“甜点”的差异受沉积环境变化和成岩作用影响,近岸滩和远岸滩物性较好,其次为远岸坝和云坪,压实作用和胶结作用是降低储集能力的两大因素,溶蚀作用可一定程度上改善其物性。③研究区上“甜点”具有“高自然伽马-高电阻率”特征,测井曲线呈尖峰状;下“甜点”具有“中自然伽马-高电阻率”特征;核磁孔隙度大于5.5%可作为识别“甜点”的敏感参数,地震反演剖面上“甜点”具有中高阻抗特征。④下“甜点”段相较于上“甜点”段在凹陷内分布更广,储层物性更优。
中图分类号:
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