石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (1): 201-208.doi: 10.11743/ogg20200118
吴世强1(), 陈凤玲1, 姜在兴2, 孔祥鑫2, 陈晨2, 管文静1
收稿日期:
2019-08-01
出版日期:
2020-02-01
发布日期:
2020-01-19
作者简介:
吴世强(1979-),男,硕士、高级工程师,页岩油综合研究。E-mail:基金资助:
Shiqiang Wu1(), Fengling Chen1, Zaixing Jiang2, Xiangxin Kong2, Chen Chen2, Wenjing Guan1
Received:
2019-08-01
Online:
2020-02-01
Published:
2020-01-19
Supported by:
摘要:
潜江凹陷位于江汉盆地,其古近系潜江组以含有由富有机质白云岩和蒸发岩组成的193个韵律层为特征。然而,潜江凹陷古近系潜江组白云石的成因一直存在争议,限制了进一步对非常规油气的勘探工作。根据盐间层岩相与矿物特征研究潜江组盐间层富白云石岩相的沉积成因。根据沉积特征观测(岩心和薄片)和矿物组分数据,可识别出3种主要的岩相结合:薄层-纹层状泥晶白云岩、纹层状含云泥晶灰岩和夹钙芒硝层状泥晶白云岩。研究发现前两种岩相组合纹层特征明显,可见有机质纹层与无机纹层交互现象,说明形成于水体较深的还原环境。白云石与方解石晶体含有有机质降解孔,且白云石与黄铁矿和有机质薄膜共生,说明其成因与微生物诱导活动有关。浮游微生物和底栖藻分别控制了方解石和白云石的沉淀。这些岩相组合含有较高的有机质含量。最后一种岩相组合具有较高的蒸发矿物含量和陆源碎屑物质,说明其形成于相对浅水环境。高盐度和强烈陆源输入不利于有机质的保存。此次研究发现盐湖内白云石的形成受微生物活动和蒸发环境控制,不同的成因对岩相沉积特征和有机质富集产生重要影响。
中图分类号:
图7
江汉盆地蚌页油2井Eq3(4)-10,Eq4L-6和Eq4L-15韵律矿物电镜特征 a.环状白云石组合,埋深3 404.30 m;b.为a的能谱结果;c.泥晶白云石、黄铁矿与有机质薄膜,埋深3 404.30 m;d.粘土包裹的白云石,埋深3 404.30 m; e.为d的能谱结果; f.粘土包裹的白云石,埋深3 404.30 m; g.白云岩内的硬石膏矿物,埋深3 600.09 m;h.为g的能谱结果;i.方解石与粘土,埋深3 596.77 m;j.含有晶内孔的方解石,红色箭头指示晶内孔,埋深3 597.43 m;k.为j的能谱结果;l.方解石与拉长的晶间孔,红色箭头指示晶间孔,埋深3 404.22 m"
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