The organic reef and bank facies, widely developed in Middle Ordovician Yijianfang Formation in Tahe oilfield , are characterized by point reefs and banks within the caronate platforms, and the reservoir spaces are mainly of microfissures and secondary dissolution pores.

The forming mechanism of solutiontype secondary pores is one of the problems which petroleum geologist are very much interested in.

This paper briefly introduces the preparation and measurement of pore solution and discusses the effects of mixed materials, two chloride salts and curing period on OH - and Cl - concentration in pore solution as well as the related mechanism.

This paper is a report on design and manufacture of the apparatus for preparing the pore Liquid of hardened cement paste and also an introduction of the method of determination by experiments of the composition of pore solution in hardened cement paste .

According to the newest testing results, it has widely analysed and expounded the granules and aggregate compositions ,pore size distribution before and after consolidation and minute structure soft clay in Shanghai and discussed the pore solution composintions and exchanging ability of cations from phy -chemical theory, and the effects of soil body brought by artificial injection.