低对比度油层测录井综合识别方法研究与应用——以珠江口盆地陆丰油田为例  

Research and application of the log-based comprehensive identification method for low-contrast oil layers:A case study of the Lufeng oilfield in the Pearl River Mouth Basin

作　　者：刘伟男 管耀 刘道理 石磊 宋伟 LIU Wei-Nan;GUAN Yao;LIU Dao-Li;SHI Lei;SONG Wei(Shenzhen Branch,CNOOC Ltd.,Shenzhen 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054

出　　处：《物探与化探》2024年第3期573-583,共11页Geophysical and Geochemical Exploration

基　　金：中国海洋石油有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”(KJGG2022-0406);中海石油(中国)有限公司深圳分公司生产性科研项目(SCKY-2024-SZ-14)。

摘　　要：在储层评价中流体性质的准确识别是一个十分关键的问题。然而在珠江口盆地陆丰地区古近系低孔低渗储层,由于高阻水层的存在,使得油水层在常规测录井响应上对比度小,给油水层的准确识别带来困难。本文在明确低对比度油层储层特征与成因分析的基础上,针对低孔低渗储层中气测响应值受钻速、孔隙度等因素影响较大的问题,推导了Flair气测响应方程,建立Flair录井响应值校正方法。基于不同流体性质组分特征存在差异,采用Flair气测曲线构建新含油指数与含水率指数;同时采用伽马概率分布函数表征地化色谱图谱特征,提取形状因子与尺度因子进行图谱特征描述。基于敏感性参数,建立基于特征参数的流体性质识别图版。实际应用表明,综合测录井资料的流体性质识别方法具有较好的效果,识别符合率达91.3%,具有较好的推广价值。The accurate identification of fluid properties is critical for reservoir evaluation.However,for the Paleogene low-porosity and low-permeability reservoirs in the Lufeng area,Pearl River Mouth Basin,the low contrast between oil and water layers in conventional logs due to the presence of high-resistivity water layers complicates the identification of oil and water layers.This study first ascertained the reservoir characteristics and genetic analysis of low-contrast oil layers.Then,it developed the Flair gas logging response equation and the Flair logging response correction method,aiming to overcome the challenge that gas logging response values of low-porosity and low-permeability reservoirs are significantly influenced by factors such as drilling rate and porosity.Given the differences in the properties and components of various fluids,this study constructed new oil-bearing and water-content indices using Flair gas logging curves.Moreover,this study characterized the geochemical chromatogram using a gamma probability distribution function and extracted the shape and scale factors to describe the chromatogram characteristics.Based on sensitivity parameters,this study plotted the characteristic parameter-based fluid property identification chart.The practical application shows that the log-based comprehensive fluid property identification method can yield satisfactory effects,achieving a compliance rate of 91.3%.Therefore,this method can be popularized.

关 键 词：低对比度油层 残余油 Flair录井校正 地化色谱图谱 伽马分布 流体识别 

分 类 号：P631.4[天文地球—地质矿产勘探]