轮南油田水淹层综合录井评价方法

Mud logging evaluation methods for waterflooded layers in Lunnan Oilfield

目前,塔里木轮南油田已经进入高含水期,因此在实施轮南二次开发的同时,开展了轮南油田水淹层录井新技术应用研究。根据轮南油田储集层水淹程度不同导致录井发生相应变化规律的特征,以国内常用的岩石热解、轻烃分析、热解气相色谱、定量荧光、荧光显微图像5种录井技术为基础,借鉴东部油田多年来水淹层录井评价研究成果,结合轮南油田的实际情况及各种方法的优势,探索一种综合性水淹层解释评价趋势法,旨在为投产选层和射孔位置确定提供依据。通过对轮南油田现有资料结合完井试油资料的分析研究,初步建立了该地区储集层岩石热解、轻烃分析、热解气相色谱、定量荧光、荧光显微图像谱图水洗特征以及储集层水洗程度定量评价标准。该方法用于轮南地区主力油层三叠系油层组解释13口井17层水淹层,经完井试油验证符合13层,其判别符合率为76.5%,应用效果较好。轮南油田开展水淹层评价应用研究,拓展和完善了该地区录井水淹层评价的思路,对提高采油效率、提升油田开发水平具有重要价值,故具有较好的应用前景。

At present,Lunnan Oilfield in Tarim Basin has entered high water cut period.Therefore,at the same time of secondary development in Lunnan Oilfield,the study of applying new mud logging techniques in waterflooded zones of Lunnan Oilfield was made.According to the characteristics that the different waterflushed degrees of reservoirs in Lunnan Oilfield resulting in corresponding mud logging changing rules,on the basis of five kinds of common mud logging techniques of rock pyrolysis,light hydrocarbon chromatography,gas chromatography,quantitative fluorescence and fluorescence microscopic image,referring the years′mud logging evaluation research on waterflooded layers in eastern oilfields,combining with the actual situation in Lunnan Oilfield and the advantages of various methods,the authors explored a comprehensive method of trend interpretation and evaluation for waterflooded layers.Through combining oilfield existing analysis data with well completion test data,the authors initially established the area′s reservoir waterflushed spectral configuration trend features of rock pyrolysis,light hydrocarbon chromatography,gas chromatography,quantitative fluorescence and fluorescence microscopic images and quantitative evaluation criteria of reservoir waterflushed level.This method was used to interpret 17 water flooded layers of13 wells in Triassic oil group for major pay zones of Lunnan area,well completing test verified 14 layers conformed to criteria and its discriminant coincidence rate was over 80%with better application.Lunnan Oilfield made the evaluation study on waterflooded layers,which enriched and improved the region′s mud logging evaluation ideas for waterflooded layers,and provided a basis for determining the horizons of putting into production layers and perforating.It has an important value for enhancing oil recovery efficiency,and improving the level of oilfield development with a good prospect.