新疆石油地质 ›› 2022, Vol. 43 ›› Issue (6): 724-732.doi: 10.7657/XJPG20220610
雷海艳(), 齐婧, 周妮, 陈俊, 孟颖, 张锡新, 陈锐兵
收稿日期:
2022-08-29
修回日期:
2022-09-22
出版日期:
2022-12-01
发布日期:
2022-11-22
作者简介:
雷海艳(1987-),女,四川蓬溪人,高级工程师,硕士,油气勘探,(Tel)13689970696(E-mail)基金资助:
LEI Haiyan(), QI Jing, ZHOU Ni, CHEN Jun, MENG Ying, ZHANG Xixin, CHEN Ruibing
Received:
2022-08-29
Revised:
2022-09-22
Online:
2022-12-01
Published:
2022-11-22
摘要:
准噶尔盆地玛湖凹陷玛北斜坡区玛页1井风城组发育富硅页岩,以富集自生硅质为特征,富硅页岩层段是该区页岩油分布最广的层段。利用岩心描述、岩石薄片鉴定、电镜扫描、古生物分析、地球化学测试等资料,采用多尺度岩矿学和地球化学结合的方法,对玛北斜坡区风城组富硅页岩纵向分布、自生硅质成因、富硅页岩中藻类的类型和生烃情况以及与硅质相关的孔隙结构展开了研究。结果表明,玛页1井风城组自生硅质的发育与碱湖pH值较高有关,火山物质和陆源碎屑在高pH值条件下易释放溶解硅,在持续蒸发或pH值降低条件下重新结晶形成富硅页岩。富硅页岩中的硅质条带和团块中发育大量保存完好的球形生物化石,为古盐藻休眠孢子,生烃效果显著。富硅页岩脆性较高,发育裂缝、晶间孔和晶间溶孔。玛页1井风城组自生硅质在生烃和成储过程中发挥着重要作用,该研究结果可为玛北斜坡区风城组页岩油的进一步勘探提供借鉴。
中图分类号:
雷海艳, 齐婧, 周妮, 陈俊, 孟颖, 张锡新, 陈锐兵. 玛湖凹陷玛页1井风城组富硅页岩成因及其油气意义[J]. 新疆石油地质, 2022, 43(6): 724-732.
LEI Haiyan, QI Jing, ZHOU Ni, CHEN Jun, MENG Ying, ZHANG Xixin, CHEN Ruibing. Genesis and Petroleum Significance of Silica-Rich Shale in Fengcheng Formation of Well Maye-1,Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 724-732.
图6
玛北斜坡区风城组古盐藻休眠孢子微观特征 a—玛页1井,4 851.38 m,风二段,硅质条带,单偏光;b—玛页1井,4 851.38 m,风二段,硅质页岩中球形藻类化石,单偏光;c—玛页1井,4 851.38 m,风二段,硅质页岩中古盐藻休眠孢子单体,单偏光;d—玛页1井,4 592.28 m,风三段,硅质页岩中球形藻类化石,单偏光;e—夏40井,4 766.90 m,风城组,硅质页岩中球形藻类化石,正交偏光;f—玛页1井,4 743.13 m,风二段,硅质页岩中球形藻类化石,扫描电镜;g—现代盐藻休眠孢子;h—玛页1井,4 629.57 m,风二段,古盐藻休眠孢子,正交偏光;i—玛页1井,4 629.57 m,风二段,古盐藻休眠孢子,荧光图像"
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