南海A油田古近系低孔低渗储层录井评价方法研究

Study on mud logging evaluation methods of Paleogene low porosity and low permeability reservoirs in Nanhai A oilfield

南海A油田古近系文昌组低孔低渗储层发育,且存在局部高阻水层,水层与油层测井电阻率非常接近,导致流体性质与储层物性评价较难。为了解决开发生产过程中储层流体性质与物性随钻判断的不确定性问题,创新建立了基于荧光显示、FLAIR实时流体录井与地化录井技术的储层流体性质评价方法,以及基于录井机械比能、切向功与测井密度曲线的储层物性综合评价方法。在A油田文昌组低孔低渗储层的流体性质识别与物性判别的应用结果表明,该方法具有较好的实用性,可为油田高效开发作业提供有力支持,具有较好的应用前景。

Low porosity and low permeability reservoirs developed in the Paleogene Wenchang Formation of Nanhai A oilfield.There are local high resistivity water layers.The resistivity logs of water layers and oil layers are very close,it is difficult to evaluate the fluid properties and reservoir physical properties.In order to solve the uncertainty of the reservoir fluid property and physical property judgment while drilling during development and production,the evaluation methods of reservoir fluid properties based on fluorescence display,FLAIR real-time fluid logging and geochemical logging technologies and the comprehensive evaluation methods of reservoir physical properties based on mud logging mechanical specific energy,tangential work and logging density curves were established.The application results of fluid property identification and physical property discrimination in Wenchang Formation low porosity and low permeability reservoirs in A oilfield show that these methods have good practicability,can provide strong support for the efficient development operation of the oilfield,and have good application prospects.