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    风化粘土层-半风化岩石型不整合的矿物学、地球化学特征

    李晓燕 蒋有录 陈涛

    李晓燕, 蒋有录, 陈涛, 2009. 风化粘土层-半风化岩石型不整合的矿物学、地球化学特征. 地球科学, 34(3): 428-434.
    引用本文: 李晓燕, 蒋有录, 陈涛, 2009. 风化粘土层-半风化岩石型不整合的矿物学、地球化学特征. 地球科学, 34(3): 428-434.
    LI Xiao-yan, JIANG You-lu, CHEN Tao, 2009. Mineralogical and Geochemical Characteristics of Unconformity Structure with Weathered Clay and Sapropelic Rock. Earth Science, 34(3): 428-434.
    Citation: LI Xiao-yan, JIANG You-lu, CHEN Tao, 2009. Mineralogical and Geochemical Characteristics of Unconformity Structure with Weathered Clay and Sapropelic Rock. Earth Science, 34(3): 428-434.

    风化粘土层-半风化岩石型不整合的矿物学、地球化学特征

    基金项目: 中国石油化工股份公司重大科技攻关项目“济阳坳陷第三系不整合油气藏形成与分布规律”部分成果
    详细信息
      作者简介:

      李晓燕(1976-)‚女‚博士研究生‚主要研究方向为油气成藏机理与分布规律.E-mail: upclxy@yahoo.cn

    • 中图分类号: P591; P618

    Mineralogical and Geochemical Characteristics of Unconformity Structure with Weathered Clay and Sapropelic Rock

    • 摘要: 不整合是构造运动和海(湖) 平面升降的产物, 其风化粘土层可作为油藏的良好封盖层, 半风化岩石孔缝系统可作为油气运移通道, 也可为油气聚集提供良好储层.深入分析不整合结构在矿物含量变化、元素及其氧化物含量变化方面的微观特征是划分不整合结构的基础, 对不整合油气藏的勘探实践具有重要意义.不整合结构可划分为风化粘土层-半风化岩石型、半风化岩石型和沉积间断型.通过济阳坳陷义和庄凸起前第三系风化粘土层-半风化岩石型不整合结构矿物与元素变化的实测数据, 结合典型地区风化壳的矿物、元素分析结果, 分析了风化粘土层-半风化岩石型不整合结构的矿物学、常量元素地球化学特征: 其矿物学特征主要表现为长石、云母等原生矿物的蚀变和高岭石、伊利石及蒙脱石等次生粘土矿物的明显增多, 粘土矿物在风化粘土层中部或风化粘土层下部-半风化岩石上部较为富集; 其常量元素地球化学特征表现为Ca、Na元素含量迅速减少, 在风化粘土层下部与半风化岩石上部通常具有Fe、Al元素的富集带, K、Mg元素的变化由于交代作用等因素而变得复杂.

       

    • 图  1  义和庄凸起沾北2井前第三系埋藏古风化壳主要矿物含量变化

      Fig.  1.  Diagram showing the change of main minerals contents of pre-Tertiary buried weathered crust of well Zhanbei 2 in Yihezhuang uplift

      图  2  新加坡花岗岩质风化壳(Rahardjo et al., 2004)(a)和委内瑞拉安第斯山北部古风化壳(William et al., 2001)(b)粘土矿物含量变化

      Fig.  2.  Diagram showing the change of clay minerals contents of granite weathered crust in Singapore (Rahardjo et al., 2004)(a) and paleo-crust of the North Andean in Venezuela (William et al., 2001)(b)

      图  3  义和庄凸起沾北2井前第三系埋藏古风化壳常量元素含量变化

      Fig.  3.  Diagram showing the change of elements contents of pre-Tertiary buried weathered crust of well Zhanbei 2 in Yihezhuang uplift

      图  4  美国东南部地区花岗片麻岩风化壳(a)和辉绿岩风化壳(b)元素氧化物含量变化(据Neung-Hwan, 2005)

      Fig.  4.  Diagram showing the change of elements contents of granite gneiss (a) and diabase (b)weathered crusts in Southeast America

      图  5  委内瑞拉安第斯山北部古风化壳元素含量变化(据William et al., 2001)

      Fig.  5.  Diagram showing the change of elements contents of the North Andean paleo-crust in Venezuela

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    • 收稿日期:  2009-01-21
    • 刊出日期:  2009-05-25

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