西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (1): 41-44.DOI: 10.3863/j.issn.1674-5086.2009.01.010

• 地质勘探 • 上一篇    下一篇

不整合研究中的化学风化指标

陈涛1 蒋有录1 宋国奇2 刘华1 赵乐强2   

  1. 1.中国石油大学地球资源与信息学院,山东东营257061;2.中国石化胜利油田分公司,山东东营257001
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-02-20 发布日期:2009-02-20

APPLICATION OF CHEMICAL WEATHERING INDICES IN THE STUDY ON UNCONFORMITY

CHEN Tao1 JIANG You-lu1 SONG Guo-qi2 LIU Hua1 ZHAO Le-qiang2   

  1. 1.Faculty of Geo-Resource and Information,China University of petroleum,Dongying Shandong 257061,China;2.Shengli Oil Field Company,SINOPEC,Dongying Shandong 257001,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-02-20 Published:2009-02-20

摘要:

通过研究不整合结构发现,不整合面下风化岩石同风化壳一样在元素含量上具有富Fe、Al、Ti,贫Ca、Mg、Na的变化规律,因此用于研究风化壳的化学风化指标(IWPVICA、ICWIPA等),同样适用于研究不整合面下风化岩石。由于母岩成分的差异,风化指标的适用性和界限值不同,VICAICWIPA指标可用于碳酸盐岩不整合结构划分,其中风化粘土层其他:ICA>90,ICW>95,V>10,IPA>95,半风化岩石:ICA介于50~90,ICW介于50~95,V介于1~10,IPA介于50~95;VICW指标也可用于碎屑岩不整合结构划分,风化粘土层其他:V>5,ICW>90,半风化岩石:V介于1~5,ICW介于50~90。利用化学风化指标可以定量地进行不整合结构划分,提高了不整合结构研究的精度。

关键词: 化学风化指标, 不整合, 结构划分, 碳酸盐岩, 碎屑岩

Abstract:

According to the studies on unconformity structures,it can be concluded that the rocks in unconformity structural layer are rich in Fe,Al and Ti while poor in Ca,Mg and Na,so indices (IWPVICAICWIPA,etc.) that can be used to study the weathering crust is also applicable in unconformity structure.Because the applicability and the threshold value of the indices change as the elements of mother rocks,the V,ICA,ICW,IPA is suitable for carbonate rocks in weathered clay rocks,ICA>90,ICW>95,V>10,IPA>95,in semi-weathered rocks,ICA=50~90,ICW=50~95,V=1~10,IPA=50~95),and the V,ICW is suitable for clastic rock(semi-weathered rock:V>5,ICW>90;semi-weathered rocks,V=1~5,ICW=50~95.The unconformity in the Jiyang depression is quantitatively classified with the chemical weathering index,which can further improve the accuracy of the structure research on the unconformity.

Key words: chemical weathering index, unconformity, structure classification, carbonate rock, clastic rock

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