泥晶灰岩的成岩作用与微孔隙研究

本文用岩石学方法结合超微技术及现代测试手段研究泥晶灰碉的成岩作用微孔隙。结果表明，对泥晶灰岩微孔隙形成有得的主要成岩作用为压溶、溶解和一定程度的云化及去云化、硅和去硅化作用。这些作用可以扩大微孔主微裂隙，使之有可能具有储集性能。

THE DIAGENESIS AND MICROPORES OF MICRITES

This article deals with the diagenesis and micropores of micrites in the Palaeozoic and Mesozoic marine carbonate sequences from the middle and lower Yangtze area. The micrites are characterized by simple original composition, flue grain, low porosity and permeability. They are not considered commonly as reservior rocks. Our preliminary studies show that diagenetic processes such as pressure solution, dissolution, penecontemporaneous dolomitization, late dedolomitization, and desilicification have contributed to the development of micropores and even visible pores. The micropores formed during sedimentation and diagenesis can be distinguished into Primary and secondary types, and the majority of microfissures are caused by dissolution and pressure-solution. The amount of such pores and fissures increases with increasing intensity of constructive diagenesis. Although their practical significance to the reservior rocks is not yet clear enough, the well development of the micropores and their connectivity could be considered as an indication for the possibility that these micrites will become reservior rocks, and hence they deserve further Investigation.