岩性油气藏 ›› 2022, Vol. 34 ›› Issue (1): 118129.doi: 10.12108/yxyqc.20220112
赵笑笑1,2, 闫建平1,2,3, 王敏4, 何贤2, 钟光海5, 王军4, 耿斌4, 胡钦红6, 李志鹏4
ZHAO Xiaoxiao1,2, YAN Jianping1,2,3, WANG Min4, HE Xian2, ZHONG Guanghai5, WANG Jun4, GENG Bin4, HU Qinhong6, LI Zhipeng4
摘要: 为了研究沾化凹陷沙三段湖相页岩夹层与页岩油产能之间的关系,在分析岩心描述、薄片鉴定、X射线衍射、扫描电镜、压汞等资料的基础上,利用反褶积方法处理测井资料识别夹层类型。结果表明:①砂质夹层和灰质夹层的脆性矿物含量高,易形成裂缝。其中砂质夹层长英矿物和灰质夹层碳酸盐岩矿物的质量分数高达46.7%,57.95%;②夹层中发育异常压力缝、矿物收缩缝、层间缝,在砂质夹层中还发育构造缝。出现裂缝的夹层平均渗透率高达7.59 mD;③夹层主要发育微—纳米级孔隙,有粒间孔、溶蚀孔和晶间孔,孔隙连通性较好。粒间孔常见于砂质夹层。溶蚀孔常见于灰质夹层,大孔隙较多;④夹层测井曲线响应特征:砂质夹层和灰质夹层都表现为低自然伽马和高电阻率特征,砂质夹层具有自然伽马在高背景下低回返、三孔隙度曲线和深侧向电阻率向右偏移,灰质夹层的三孔隙度曲线呈明显向右“靠拢”。利用反褶积方法处理后的自然伽马、深侧向电阻率曲线进行重叠可快速识别夹层且分辨率更高、更直观,能够有效地识别湖相泥页岩夹层,为页岩油评价提供依据。
中图分类号:
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