确定水驱油藏地层混合液电阻率的方法

Methods for Determining Resistivity of Mixed Formation Water in Water Drive Reservoir.

褚人杰等．确定水驱油藏地层混合液电阻率的方法．测井技术，１９９５，１９（２）：１１７～１２５我国东部地区绝大多数老油田是注水开发的，注入水的矿化度一般低于地层原生水矿化度。生产实践与试验证明，一些经过长期水洗的强水淹层，在电阻率曲线上呈高值，往往是“好”油层的显示。在新钻的调整井中按这种高阻显示进行射孔，往往产水很高，出现了测井解释及投产符合率较低的现象；而有些中等电阻率层往往出油。产生这种现象的主要原因之一是在使用阿尔奇公式进行解释时，没有认识到水驱油藏目的层的混合液电阻率（Ｒｚ）在变化。因此，若不在求准地层混合液电阻率上下功夫，则测井解释与单井投产符合率较低。许多油田及研究单位对此作了研究，见到了较明显的效果。本文汇总了求Ｒｚ的部分有效办法，以利于水淹层测井解释水平的提高。

Most of the oilfields in eastern China are developed by water flooding.Salinityof flooding water is lower than that of connate water.Production and experimentshow that resistivity of some heavily watered out zones is very high after long timeflooding,which is good oil show. But if perforated,a large amount of water comesout,while zones with medium resistivity may produce oil.The key reason for thisphenomenon is that mixed formation water resistivity of the formatoin of interest inwater-drive reservoir is always changing. If resistivity of mixed formation watercan not be determined correctly,the interpretation result will not coincide with theresult of well test.A ic f of work has been done on this subject by many organizations in China.The results are summarized in this paper and the effective methodsfor determining resistivity of mixed formation water are given to improve interpretation of watered-out area.