石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (4): 811-823, 890.doi: 10.11743/ogg20200414
收稿日期:
2018-11-19
出版日期:
2020-08-01
发布日期:
2020-08-11
第一作者简介:
邓远(1990-),男,博士研究生,非常规油气地质。E-mail:基金项目:
Yuan Deng1(), Shiyue Chen1, Xiugang Pu2, Jihua Yan1, Jia Chen3
Received:
2018-11-19
Online:
2020-08-01
Published:
2020-08-11
摘要:
非常规油气的兴起引发了细粒沉积岩研究的热潮,然而对湖相细粒沉积岩形成机理与环境演化的研究尚处于探索阶段。基于岩心、薄片、全岩X射线衍射、AMICS矿物分析和地球化学等资料,以岩石类型和沉积构造为依据,将渤海湾盆地沧东凹陷孔(孔店组)二段细粒沉积岩划分为层状细粒长英沉积岩相、块状细粒混积岩相、纹层状细粒混积岩相、纹层状白云岩相和块状白云岩相等5种岩相类型,详细分析每种岩相的沉积环境和形成机理。不同岩相按照一定次序叠置构成4类典型岩相组合,在气候干湿度、水体性质和物源供给强度等方面差异显著,分别对应强陆源输入沉积模式、季节性气候沉积模式、半干旱季节性气候沉积模式和持续干旱沉积模式。通过岩相组合划分和地球化学特征分析,孔二段沉积时期沧东凹陷沉积环境自下而上可划分为Ek2(4)~Ek2(3)季节性气候阶段、Ek2(2)潮湿气候阶段与Ek2(1)干旱-潮湿转换阶段。研究成果可以为沧东凹陷页岩油的勘探和开发提供理论依据。
中图分类号:
图6
沧东凹陷孔二段细粒混积岩相特征 a.块状细粒混积岩相,灰色均匀块状,GD14井,埋深3 972.85m;b.不同矿物均匀混合,不显定向性,G108-8井,埋深3 292.26 m; c.块状细粒混积岩相,BSE图像,G108-8井,埋深2 975.93 m; d.块状细粒混积岩相,AMICS图像,G108-8井,埋深2 975.93 m; e.纹层状细粒混积岩相,发育层理缝,G108-8井,埋深2 963.56 m; f.碳酸盐-长英质-粘土三元纹层结构,G108-8井,埋深3 300.40 m; g.纹层状细粒混积岩相,BSE图像,G108-8井,埋深2 977.05 m; h.纹层状细粒混积岩相,AMICS图像,G108-8井,埋深2 977.05 m"
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