白云化过程中岩石孔隙体积的变化

CHANGE OF PORE VOLUME IN DOLOMITIZATION

陈彦华 刘莺 孙妥

Chen Yanhue Liu Ying Sun Tuo

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Ministry of Geology and Mineral Resources

对白云化过程中岩石孔隙体积的变化,不同学者以各自研究对象的具体资料出发,得出了不同的认识和结论。归纳起来,有下列三种:1.白云化作用增加岩石孔隙体积,因而改善岩石的储集性。R.W.鲍尔斯(1962)对沙特阿拉伯上侏罗统D段碳酸盐岩储层研究指出:在任何结构类型的岩石中,白云石含量在10—80%时,孔渗降低;而含量达80-90%时,孔渗增加;超过90%又下降。

The changes of pore volume in dolomitization is essential to the reservoir properties. Recently, there are three kind of views in recongnizing the change: 1.There is an increase of pore volume during dolomitization; 2.There is a decrease of pore volume during dolomitization; 3.There is no volume change during dolomitization. The author suggests that dolomitization is nearly a volume for volume replacement. There is little effect on pore volume in simple dolomitization. The author presents 2 models of the formation of "Sucrosic" dolostoen which preserved good reservoir properties. (1) Replacement-soution model, and (2) Replacement-conversion model. The formetion of "Sucrosic" Dolostone is not an inevitable result of dolomitization but a product of specific dolomitization environment and certain textural condition.

https://doi.org/10.11781/sysydz198501029