石油与天然气地质 ›› 1999, Vol. 20 ›› Issue (2): 99-103,119.doi: 10.11743/ogg19990201

• 论文 •    下一篇

伊蒙混层粘土I/S比加大方式及成分控制──以珠江口盆地两口井为例

邬金华1, 余素玉1, 许仕策2, 刘丽华2   

  1. 1. 中国地质大学, 湖北武汉 430074;
    2. 南海东部石油公司科技研究中心, 广东广州 510240
  • 收稿日期:1990-08-19 出版日期:1999-06-25 发布日期:2012-01-18
  • 基金项目:

    国家自然科学基金4913206-05项目资助

I/S RATIO INCREASE WAYS AND ITS COMPOSITION CONTROL OF ILLITE SMECTITE MIXED LAYER CLAY:AN EXAMPLE OF TWO WELLS IN ZHUJIANGKOU BASIN

Wu Jinhua1, Yu Shuyu1, Xu Shice2, Liu Lihua2   

  1. 1. China University of Geosciences, Wuhan;
    2. Research Institute of Eastern South China Sea Oil Corporation, Guangzhou
  • Received:1990-08-19 Online:1999-06-25 Published:2012-01-18

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摘要：

对珠江口盆地两口井泥质岩中粘土矿物X衍射分析资料的分段定量研究证实,在渐进成岩过程中,伊-蒙混层粘土的伊利石层和蒙皂石层的含量之比(I/S)的加大,与钾长石的溶解有关。有三种形式:若沉积有机质和钾长石足够丰富,加大将优先以伊利石层净增加的方式进行,其出现的温度大致与生油门限温度相当或稍高;低于该温度,蒙皂石层将按溶解-沉淀机理伊利石化;若无K+供给,加大方式将是蒙皂石净溶解。一般情况下的渗透率均可保证离子的通畅输导而与加大方式无关;仅当渗透率低到只对较大的铝的有机络合离子具有过滤作用时,才可能使净增伊利石层被伊利石化反应所取代;更低渗透率或体系封闭将使所有加大行为趋于停止。

关键词: 伊-蒙混层粘土, 伊利石化, 伊利石净增加, 蒙皂石净溶解, 成分控制

Abstract:

Based on the sectioned quantitative study of XRD data of clay minerals in argillites from two wells in Zhujiangkou Basin,it is proved that the increase of the ratio of illite and smectite layer contents in illite-smectite mixed layer clay(I/S)is related mainly to the dissolution of potassium feldspar.When deposited organic substances and potassium feldspar are abundant enough,the ratio increase would proceed by the net increase of illite layers at the temperature roughly corresponding to or slightly higher than that of the oil generation threshold;when the temperature is lower than that of threshold,smectite layers would be converted to illite according to dissolution precipitation mechanism;if no supply of K+,the ratio would increase by net dissolution of smectite layers.In general,the increase ways are independent of the permeability because it could usually allow the ions to transport smoothly.Only when it as low as to filter merely the big organic complex aluminium ions,the illitization reaction would substitute for the net addition of illite layers.Permeability even lower than that or the system being closed would stop the trend of the increase in all ways.

Key words: illite-smectite mixed layer clay, illitization, net addition of illite, net dissolution of smectite, composition control