四川盆地复兴地区侏罗系陆相页岩油可采储量评价方法  

An integrated method for estimating recoverable reserves of Jurassic continental shale oil in Fuxing area,Sichuan Basin

作　　者：沈童[1] 卢文涛[1] 郑爱维[1] 王立[1] 常振 SHEN Tong;LU Wentao;ZHENG Aiwei;WANG Li;CHANG Zhen(Research Institute of Exploration and Development,Sinopec Jianghan Oilfield Company,Wuhan,Hubei 430000,China)

机构地区：[1]中国石化江汉油田分公司勘探开发研究院,湖北武汉430000

出　　处：《天然气勘探与开发》2024年第5期39-47,共9页Natural Gas Exploration and Development

基　　金：中国石油化工股份有限公司先导项目(编号:YTBXD-FCZY-2024-1-04-002)。

摘　　要：复兴地区位于涪陵区块北部,地处重庆境内,为低山—丘陵地貌,地面海拔300~600 m。构造上位于四川盆地川东高陡褶皱带万州复向斜,复兴侏罗系属于陆相页岩油气藏,页岩具有“高黏土、多隔夹层、中—低有机质丰度、中高热演化”的特征,通过体积压裂方式改造储层,定压或定产生产、变换工作制度等多种手段调整生产动态,实现油井的短期高产或长期稳产,使得复兴页岩油的渗流特征变得异常复杂,增加了油井的动态分析和产能的预测难度。为此,针对复兴侏罗系下统凉高山组二段下亚段陆相页岩地质特点及生产动态特征,基于弹性产率法、传统产量递减法、现代产量递减法3种主要的产量计算方法,建立一套适用于复兴侏罗系凉高山组陆相页岩油可采储量的综合预测方法。实例分析表明:(1)该方法能够较好地拟合历史生产数据,推测压后裂缝及地层参数;(2)预测单井可采储量为2.1×10^(4)~2.3×10~4 t,与数值模拟方法预测的2.14×10^(4)t相比,平均误差仅为1.96%;(3)单一的可采储量计算方法存在一定的局限性,该方法进一步提高了可采储量的预测精度。结论认为,构建的复兴陆相页岩油可采储量综合预测方法体系,对不同开发阶段、不同生产制度下的可采储量拟合及预测具备不同的适应性,能够较为系统、快速、准确地评价油井产能,也为同类型油藏可采储量预测与评价提供了一种新的思路与借鉴。The Fuxing area is located in the northern part of the Fuling block,situated within the territory of Chongqing.It features a low mountain and hilly topography with a ground elevation of 300~600 m.Tectonically,it is located in the Wanzhou synclinorium of the high steep fold belt in the eastern Sichuan Basin.The Jurassic continental shale reservoirs in the Fuxing area are characterized by high clay content,multiple interlayers,medium-low organic matter abundance,and medium-high thermal evolution.Reservoir stimulation by volume fracturing,and production dynamic adjustment by means such as constant-pressure/rate production and changing working systems realize short-term high production or long-term stable production,but result in extremely complex seepage behaviors of shale oil in the area,which makes the dynamic analysis and productivity prediction more challenging.Considering the geological and production dynamic characteristics of the continental shales in the lower submember of the second member of the Lower Jurassic Lianggaoshan Formation in the Fuxing area,an integrated method for estimating recoverable reserves of continental shale oil in the Formation was established on the basis of three popular production calculation methods:the elastic yield,the traditional production decline,and the advanced production decline.Application case shows that,(i)the integrated method enables history matching of production data,and prediction of post-frac fractures and formation parameters;(ii)the estimated recoverable reserves of 2.1×10^(4)-2.3×10^(4) t per well have an average error of only 1.96%in contrast to the value(2.14×10^(4) t)estimated by numerical simulation method;and(iii)a single method estimating recoverable reserves has a certain limitation in application,but this integrated method can provide a more accurate estimation.The proposed method for estimating recoverable reserves of continental shale oil is adaptable to matching and estimating recoverable reserves at different development stages and under different

关 键 词：复兴地区 侏罗系 陆相页岩油 可采储量预测 产能评价 

分 类 号：TE155[石油与天然气工程—油气勘探]