“低阻油层”的识别与认识  

A Discussion on"Low Resistivity Reservoirs"

作　　者：李厚义 黄文革 马一亚 蔡琳 纪涛 李红卫 刘荣芳 

机构地区：[1]中国石油华北油田公司勘探开发研究院,河北省任丘市062552 [2]中国石油华北油田公司二连分公司,内蒙古锡林浩特市026017 [3]中国石油测井公司华北事业部,河北省任丘市062552

出　　处：《中国石油勘探》2008年第1期68-74,共7页China Petroleum Exploration

摘　　要：阿尔奇公式中的地层水电阻率R_w应有严格的使用条件。R_w选用不当是造成解释符合率降低的主要原因。"低阻油层"是一个不妥当的概念,在岩性、孔隙度相同的条件下,油层电阻率一定要比含同一矿化度地层水的水层电阻率高4倍左右,从这个意义上讲,"低阻油层"基本上是不存在的。所谓"低阻油层",大多数是由油层高矿化度和水层低矿化度的比较所产生的,两者相互依存,缺一不可,是陆相沉积油藏独有和一般现象。解决"低阻油层"的方法有两个:一是求得油层束缚水电阻率后经阿尔奇公式求得含水饱和度;二是不依靠地层水电阻率求地层含油饱和度。我国测井工作者独自研发的双频电阻率测井属于后者,目前已取得了很好的地质效果,正在一些油田推广使用。Rw,the resistivity of formation water used in the Archie formula,should be strictly applied.Inappropriate selection of Rw is the main cause of low interpretation coincidence rate.Under the same lithology and porosity,the resistivity of the oil formation should be four times higher than that of the water formation with the formation water under the same salinity.So 'low resistivity reservoirs' is an improper concept and such reservoirs do not exist at all.So called'low resistivity reservoirs'is mostly proposed by comparing the oil formation with high salinity with the water formation with low salinity.They are closely interrelated.It is a single but common phenomenon for terrestrial sedimentary reservoirs.There are two approaches to solve the problem of'low resistivity reservoirs'.The first one is to calculate water saturation based on Archie formula after calculating irreducible water resistivity. The second one is to oil saturation without using the resistivity of formation water.The well logging method based on double-frequency resistivity independently developed by Chinese logging workers can be classified into the latter one.Good geologic results have been obtained now and they are being applied to some oilfields.

关 键 词：低阻油层 陆相沉积 地层水电阻率 含水饱和度 阿尔奇公式 解释符合率 双频电阻率测井 

分 类 号：P631.8[天文地球—地质矿产勘探]