砂岩中某些成岩现象与有机质和粘土矿物演化关系的探讨——以东濮凹陷渐新世储层成岩变化为例

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APPROACHES TO THE DIAGENESIS OF SANDSTONES AND THE RELATIONSHIP BETWEEN ORGANIC MATTER AND CLAY MINERAL——An Example of Diagenetic Changes in Oligocene Reservoir of Dongpu Depression

Research Institute of Petroleum Exploration and Development, Ministry of Petroleum Industry

摘要: 在东濮凹陷渐新统砂泥岩层序成岩作用研究的基础上,本文着重探讨了砂岩中所发生的成岩作用与有机质和粘土矿物的转化关系.发现混层粘土矿物的转化与有机质的热演化之间密切相关;同时,粘土矿物和有机质的演化又通过对孔隙水介质性质的影响,在一定程度上控制了砂岩中所发生的成岩作用.对于这种相关性的认识,将有助于我们对其他盆地的有机质演化和次生孔隙的形成做出预测.同时,本文还从理论上讨论了这些成岩反应和变化所经历的可能途径.

Abstract: Based on the researches on the diagenesis of Oligocene sands tone-mudstone sequences in Dongpu Depression,the authors of this paper analyse the diagenesis and the relationship between organic matter and clay mineral.It reveals that the transformation of the clay minerals is closely related to the thermal evolution of organic matter.Simultaneously,the diagenesis of the sandstones would,somehow,depend on the evolution of organic matter and through their influence on the property of porous water.The understanding of such a relationship would be favourable for the prediction of secondary porosity and the evolution of organic matter in other basin.Meanwhile,the possible diagenesis reaction and changes are also discussed theoretically.