摘要
国内页岩油以中国陆相沉积为主,地质条件复杂多变,且地质工程甜点评价要素多元,为页岩油甜点综合评价带来了困难。以渤海盆地渤南洼陷为例,基于灰色关联理论,筛选出了页岩厚度、总有机碳含量、镜质体反射率、孔隙度、热解游离烃含量、原油密度、原油黏度、地层压力和脆性指数等9个评价指标,分析了评价指标间的相关性,优化了各评价指标的权重,计算了综合评价指数,实现了页岩油甜点的综合性、定量化精准评价。分析结果显示:渤南洼陷页岩油综合评价指数高值主要分布于XYS9—Y182—Y187井区、Y283井区南部及L42井区周围,整体向南、向北综合评价指数逐渐降低,综合评价指数与单井产量具有较好的相关性,能够较好地匹配渤南洼陷页岩油单井产量;BYP5井综合评价指数自上而下整体减小,与示踪剂监测的产量贡献率趋势一致,两者具有较好的相关性。研究结果表明,页岩油水平井完井后,通过计算综合评价指数,可以及时、准确地评价水平段的甜点段,指导页岩油水平井压裂施工。
The geological conditions of shale oil in China,which is dominated by continental deposits,are complex and changeable,and the evaluation factors of geological engineering sweet spots are multiple,which brings difficulties to the comprehensive evaluation of shale oil sweet spots.With Bonan Sag in Bohai Bay Basin as an example,nine evaluation indexes were selected based on the grey correlation theory,including shale thickness,total organic carbon(TOC),vitrinite reflectance,porosity,pyrolysis free hydrocarbon content,crude oil density,crude oil viscosity,formation pressure,and brittleness index,and correlation analysis and weight optimization among these evaluation indexes were carried out to calculate a comprehensive evaluation index,so as to realize the comprehensive,quantitative,and accurate assessment of shale oil sweet spots.The results revealed that high values of the comprehensive evaluation index for shale oil in Bonan Sag were mainly concentrated in the XYS9,Y182,and Y187 well areas,as well as in the southern part of the Y283 well area and the surrounding vicinity of the L42 well area.The overall comprehensive evaluation index gradually decreased in the south and north directions.The comprehensive evaluation index had a good correlation with the single well production,which allowed for a good matching of shale oil production in Bonan Sag.The overall decline in the comprehensive evaluation index of the Well BYP5 from top to bottom,aligned with the trend of production contribution rates monitored by tracers,demonstrating a significant correlation between the two.The research indicate that after the completion of a shale oil horizontal well,by calculating the comprehensive evaluation index,the sweet spots of the horizontal section can be evaluated promptly and accurately to guide the fracturing measures of the shale oil horizontal well.
作者
王春伟
杜焕福
孙鑫
戴彩丽
杨金莉
陈荣华
WANG Chunwei;DU Huanfu;SUN Xin;DAI Caili;YANG Jinli;CHEN Ronghua(Geosteering&Logging Research Institute,Sinopec Matrix Corporation,Qingdao,Shandong,266000,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,China;Shengli Geological Logging Company,Sinopec Matrix Corporation,Dongying,Shandong,257000,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2023年第5期130-138,共9页
Petroleum Drilling Techniques
基金
中石化石油工程技术服务有限公司研发计划项目“测录定一体化技术应用平台研究”(编号:SG20-16K)
青岛市博士后项目“东营凹陷页岩油测录井产能预测方法研究”(编号:QDBSH20220201023)
中石化经纬有限公司博士后研究项目“东营凹陷页岩油测录井产能预测方法研究”(编号:JWBH2203)联合资助。
关键词
页岩油
甜点
灰色关联理论
综合评价
渤南洼陷
shale oil
sweet spot
grey correlation theory
comprehensive evaluation
Bonan Sag
