低矿化度地层硼—中子寿命测井

因高矿化度水中富含热中子俘获截面高的氯化物，中子寿命测井通常被视为仅适用于高矿化度地层水套管井的剩余油测井方法，而不适合于淡水油田。但硼化物也是易溶于水且俘获截面高的物质。如果用适当的施工工艺和配方，使低矿化度地层水内溶有硼化物，中子寿命测井同样可通过对高俘获截面的响应来观测剩余油含量。文中介绍把中子寿命从高矿化度地层移植到低矿化度地层中的新方法及其效果。在试测中为老油田提供了１０多口井资料，做了

Borite Neutron Lifetime Log in Low Salinity Zone

High salinity formation water contains large amount of chloride which has large thermal neutron capture cross section. Neutron lifetime log(NLL) is generally believed as a technique for information of remaining oil saturation, which is only adaptable to cased hole drilled through zones with high salinity formation water. In fact, borite is also easily dissolved in water and has a large capture cross section. If it is dissolved in low salinity formation water by means of proper operation and dispensing, NLL can also be applied to obtain remaining oil saturation by its response to the large capture cross section. How to run NLL in low salinity zone and its application results in more than ten wells in mature oil field are given in this paper, mainly focusing on evaluation of pay zone current quality, estimation of remaining oil saturation,features analysis of the produced liquid and determination of zones of interest.