Hydrogeochemical simulation is an effective method to study water-rock interaction. In this paper, PHREEQM was used for the simulation of water-rock interaction under water flooding in the Renqiu Oilfield. Calculated results revealed that when fresh water was injected into the reservoir, Cl and Na+ would decrease without involvement in water-rock interaction. Erosion to dolomite will lead to an increase in Ca2+, Mg2+ and CaHCO3+. Saturation index of calcite and aragonite decreased first and then increased. With fresh water accounting for up to 70%, mixed water has the strongest erosion ability. Deoiled water has erosion ability under high temperature and high partial pressure of CO2. Pyrite and gypsum were sensitive to deoiled water, which can cause the dissolution of pyrite and the precipitation of gypsum. Micrographs revealed a great deal of information about water-rock interaction.

76 dokomite samples, the water sample from 17 wells. and the sample of water sealing from the No.436 well were tested for trace elements Sr and Ba in Wumishan formation of Renqiu oil field. The dissolution and precipitation of minerals composed of these trace elements at different temperatures and under different pressures of CO2 were simulated using the PHREEQM, software. The distribution and migration of the trace elements were discussed. The result shows that the distribution of trace elements was controlled by the sedimentation environment and the post stage water-roek interaction. Minerals formed in a high energy envi ronment of subtidol zoDe have a high content of trace elements. The Sr, for examplel, may reach as high a 0.03%; While those formed in a low energy environment of suprallitoral zone have a low content of Sr, only 0.0028%. For the scaling, the content of Sr may be as high as 0.69% and that of Ba is 0.09%, much higher than that in rocks and in water of the oil field, indicating that there exists a strong condensation action in the scaling process.

鲁西南各断块盆地中广泛分布有侏罗、第三系的紫红色、杂色砂砾岩，岩石呈固结半固结状态，遇水后发生渗透、膨胀、崩解和软化等失稳现象，对煤矿建井及煤矿开采带来重大威胁。本文采用X-衍射仪、扫描电镜、压汞仪及液压伺服机等手段进行了红层软岩的物质组成、微孔结构及渗透性的试验研究，探讨了红层软岩的渗透机理及遇水失稳机理，并结合实例进行了工程应用分析。

在收集大量勘探、建井和采矿资料基础上，结合室内的测试成果对鲁西南红层的物质组成、孔隙结构、岩溶形态及溶蚀机理进行了初步研究，并探讨了红层岩溶的水文地质意义，突破了过去认为红层贫水的观点。

本文运用ADINA有限元程序对薄煤层（厚1.15m）开采后底板岩体的破坏深度进行了数什模拟，探讨了断层对破坏深度的影响，其计算结果与地质雷达探测结果是一致的，可作为底板突水预报的依据。