四川盆地茅口组岩溶缝洞型储层有效性测井评价  

Logging Evaluation on the Effectiveness of Karst Fractured-Vuggy Reservoirs in the Maokou Formation,Sichuan Basin

作　　者：张峰 罗少成 李震 牟瑜 李婷婷 ZHANG Feng;LUO Shaocheng;LI Zhen;MU Yu;LI Tingting(Well Logging Application Research Institute,China Petroleum Logging Co.Ltd.,Xi’an,Shaanxi,710077,China)

机构地区：[1]中国石油集团测井有限公司测井应用研究院,陕西西安710077

出　　处：《石油钻探技术》2020年第6期116-122,共7页Petroleum Drilling Techniques

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“非均质复杂储层测井新技术新方法研究”(编号:2019A-3610)部分研究内容。

摘　　要：针对四川盆地茅口组碳酸盐岩储层非均质性强、储集空间类型多样、储层有效性评价困难等问题,进行了测井评价研究。通过分析该地区茅口组缝洞型储层岩石孔隙结构,基于三孔隙度模型,利用胶结指数与总孔隙度、连通缝洞孔隙度、孤立缝洞孔隙度的关系,进行了储层储集空间划分。在此基础上,结合岩心刻度测井,在微电阻率扫描成像测井信息中提取视孔隙度谱和视地层水电阻率谱的均值与方差,以及裂缝孔隙度等反应孔、洞、缝的敏感性参数,并结合试气资料,建立了储层有效性评价标准:孔隙性、孔洞型储层,电成像视孔隙度谱均值大于1.9、方差大于1.2的为Ⅰ类储层,均值大于1.7、方差大于0.9的为Ⅱ类储层;裂缝性储层,Ⅰ类储层裂缝孔隙度大于0.30,Ⅱ类储层裂缝孔隙度在0.05~0.30。裂缝的连通会明显改善储层的有效性,针对孔隙性-裂缝性、孔洞型-裂缝性储层,Ⅰ类储层视地层水电阻率谱均值大于700、方差大于300,Ⅱ类储层视地层水电阻率谱均值500~700,方差100~300。依据该评价标准,对该地区20口探井进行了二次解释,有效提高了缝洞型储层解释的符合率,取得了较好的应用效果。Logging evaluation was carried out to solve the problems of high levels of heterogeneity,complexity with respect to typing reservoir spaces,and difficulty in evaluating the reservoir effectiveness in carbonate reservoirs in the Maokou Formation,Sichuan Basin.By analyzing the pore structure of the fractured-vuggy reservoirs of the Maokou Formation in the working area,the reservoir space was classified based on the tri-porosity model and the relationship between bond index and total porosity,connected fracture-vug porosity and isolated fracture-vug porosity.The information was then combined with core calibration logging,the mean value and variance of apparent porosity spectrum and apparent formation water resistivity spectrum extracted from micro-resistivity scan imaging logging data,and fracture porosity and other sensitive parameters that reflect pores,vugs and fractures,as well as the data from well testing.Integrating above information,and evaluation standard for reservoir effectiveness was established as follows:For porous and vuggy reservoirs,the mean value of electric imaging apparent porosity spectrum of Class Ⅰ reservoir is greater than 1.9 and the corresponding variance is greater than 1.2,and those of Class Ⅱ reservoirs are greater than 1.7 and 0.9,respectively.For fractured reservoirs,the fracture porosity of Class Ⅰ reservoir is greater than 0.30 while that of Class Ⅱ reservoir is between 0.05 and 0.30.Enhancing the connectivity of fractures can obviously improve the effectiveness of the reservoir.For the porous-fracture and vuggy-fracture reservoirs,the mean value of apparent formation water resistivity spectrum of Class Ⅰ reservoir is greater than 700,and the variance is greater than 300,and those of Class II reservoirs are 500-700 and 100-300,respectively.According to the evaluation standard,a secondary interpretation of 20 exploration wells in the working area was carried out,which effectively improved the interpretation coincidence rate of fractured-vuggy reservoirs,and resulted in achie

关 键 词：缝洞型储层 储层有效性 成像测井 裂缝孔隙度 茅口组 四川盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]