岩性油气藏 ›› 2024, Vol. 36 ›› Issue (4): 147158.doi: 10.12108/yxyqc.20240413
朱彪1,2, 邹妞妞1,2, 张大权3,4, 杜威3,4, 陈祎3,4
ZHU Biao1,2, ZOU Niuniu1,2, ZHANG Daquan3,4, DU Wei3,4, CHEN Yi3,4
摘要: 利用全岩 X 射线衍射(XRD)、场发射扫描电镜(FE-SEM)、核磁共振(NMR)和低温氮气吸附实验方法多尺度定性-定量表征黔北凤冈地区永凤 1 井下寒武统牛蹄塘组页岩孔隙结构特征,并探讨其影响因素与油气地质意义。研究结果表明:①黔北凤冈地区下寒武统牛蹄塘组页岩矿物组成以石英、长石与黏土矿物为主,其次为碳酸盐矿物与黄铁矿;孔隙类型主要为有机质孔、粒间孔、粒内孔与微裂缝,有机质孔与黏土矿物粒间孔最为发育。②研究区牛蹄塘组页岩比表面积平均值为 9.536 6 m2/g,总孔体积平均值为 0.009 02 cm3/g,介孔体积平均值为 0.007 95 cm3/g,宏孔体积为 0.000 37~0.004 58 cm3/g,平均为 0.001 07 cm3/g,平均孔径为 3.381~5.947 nm,介孔最为发育。页岩孔体积主要由介孔与宏孔贡献,比表面积主要由微孔与介孔贡献,微孔与介孔、宏孔连通性相对较差,介孔与宏孔连通性较好,孔隙形态主要为墨水瓶形、圆柱形和裂缝形。③研究区牛蹄塘组孔隙结构主要受 TOC、黏土矿物与脆性矿物影响,TOC 与黏土矿物对比表面积、总孔体积、介孔体积及孔隙度具有积极影响,脆性矿物则对比表面积、孔隙度、介孔体积具有消极影响。
中图分类号:
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