油层水淹地球化学响应机理及评价方法研究

随着油田开发技术的不断发展，注水采油已广泛应用到油田开发中来，由于各种液体的注入改变了原有储集层的特性，也使得储集层的评价产生了困难，该文通过岩心模拟真实地层条件下驱替实验，在注入水和化合物情况下，储集层流体性质在驱替过程中的变化，利用岩石热解、气相色谱等方法进行分析，建立水淹层的地球化学评价方法。为解决水淹层的评价开创了新的思路，并见到了实际效果。此外，通过水驱油、化合物驱油实验还表明，由于注水对储集层内的烃组成有一定影响，在地化分析参数上产生一定变化，水驱油实验的结论证实了地球化学技术评价水淹层的正确性，针对不同储集层可以采用注入驱替试剂，达到既提高产量又保护储集层、延长开采周期的目的。

Geochemical response mechanism and evaluation method study for watered-out oil layer

With the uninterrupted growth of the oilfield development technology, water injection and production has been widely applied in oilfield development. Since different liquid injection changed the original characteristics of reservoirs and brought difficulties to reservoir evaluation, the paper conducted displacement experiment on the conditions of simulating real formation with core, introduced the experiment simulated changes of reservoir fluid property during displacement under circumstances of water and compound injection, by analyzing their changes with methods of rock pyrolysis, gas chromatogram etc., the paper set up a geochemical method for watered-out layer evaluation, created a new idea for solving the evaluation of watered-out layers, and achieved good results in practice. In addition, the experiment of water displacing oil and compound displacing oil showed that geochemical analysis parameters would have a certain extent of change due to the influences exerted by water injection to hydrocarbon composition of reservoir, the experimental results of water displacing oil verified the correctness of geochemical technology evaluating watered-out layers. In accordance of the different reservoirs, the corresponding injection displacement reagent was adopted, which could achieve the goals of not only raising yield, but also protecting reservoirs and extending production period.