焉耆盆地低含水油层产生原因及解释方法探讨  

Cause of low water-cut oil layer in Yanqi Basin and the interpretation method

作　　者：方锡贤[1] 熊玉芹[1] 吉玉香[1] 

机构地区：[1]河南石油勘探局录井公司,河南南阳473132

出　　处：《大庆石油地质与开发》2007年第1期61-64,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：针对焉耆盆地部分生产井,在投产过程中存在随时间的延长含水率下降的反常现象,提出了低渗地层存在低含水油层的观点。在分析研究化验资料的基础上,探讨了储层存在多孔介质、微细孔隙水等产生低含水油层的原因。通过对低含水油层的试油与投产对比,对电性、录井显示特点的分析,提出了用测井自然电位与自然伽马对比、含油饱和度、电阻度、气测全烃曲线形态、灌满系数、地化亮点指数的变化等识别油层、低含水油层、油水同层的方法。运用该方法对该盆地部分区块的老井重新评价,改变了原观点,取得良好的效益。低含水油层的存在,可能改变部分区块的油水认识,并为增储上产提供依据,改变部分平面油水关系矛盾所致的困惑。Aiming at the abnormal phenomenon that water content of some production wells will decline along with the time in the Yanqi Basin, this paper puts forward an argument that low water - cut oil layers exist in the low permeability formation. Based on the analysis and research on test results, it discusses the existence of low water - cut oil layers due to porous media and pore water in micro pores of reservoir. Through the comparison between test and commission of low water - cut oil layers and the analysis of electric property and logging display characteristics, this paper brings forward the methods for identifying oil layer, low water- cut oil layers and oil and water layers, namely, through the comparison between natural potential and natural gamma as well as the varieties of oil saturation, electric resistivity, curve shape of hydrocarbon, volumetric coefficient and geochemical bright spot index to identify the layers. The old wells in some blocks of Yanqi Basin were re-evaluated by means of these methods, and it was found that these well contributed significantly to the production. The existing of low water-cut oil layer may change the evaluation of some blocks and increase the production, meanwhile, it can solve the problem arose from the contradiction of relations between the oil and water.

关 键 词：焉耆 双重孔喉系统 微细孔隙水 显示特点 识别方法 含水 

分 类 号：TE321[石油与天然气工程—油气田开发工程]