摘要
孔隙结构是页岩储层分类评价和产能高低的重要影响因素。为了明确页岩孔径分布区间,同时结合测井资料建立测井定量表征方法,以昭通页岩气示范区五峰组-龙马溪组优质页岩储层为研究对象,以高压压汞和气体吸附实验为基础,建立了全尺度页岩孔径表征方法;并结合核磁共振实验和核磁测井资料,实现了核磁共振测井定量表征孔径分布。结果表明:气体吸附法和高压压汞法在表征孔径方面存在一定的交叉,通过中值左右加权平均法和最大交点孔径法两种方法实现了在孔径交叉处的连续表征,目的层页岩优势孔径分布在2~12 nm,中孔占比达75.1%;核磁共振T 2(横向弛豫时间)谱与孔径分布曲线在形态上具有较好的一致性。将建立的核磁共振测井定量表征孔径的评价方法应用到储层精细评价中,建立了结合孔隙结构的深层页岩气储层分类精细评价标准,实现了储层精细评价,能够快速准确地确定水平井铂金靶体,为页岩气高效勘探开发和产能预测提供了技术支撑。
Pore structure is an important influencing factor for shale reservoir evaluation and productivity.In order to clarify the distribution range of shale pore size,and at the same time establish a quantitative characterization method of logging in combination with logging data,a full scale characterization method of shale pore size was established based on high-pressure mercury injection and gas adsorption experiments,with the high-quality shale reservoir of Wufeng Formation Longmaxi Formation in Zhaotong Shale gas demonstration area as the research object.By combining nuclear magnetic resonance experiments and nuclear magnetic logging data,quantitative characterization of pore size distribution using nuclear magnetic resonance logging was achieved.The results show that there is a certain overlap between gas adsorption method and high-pressure mercury intrusion method in characterizing pore size.Continuous characterization at the intersection of pore sizes was achieved through two methods:median weighted average method and maximum intersection pore size method.The dominant pore size distribution of the target shale is 2~12 nm,with a proportion of mesopores reaching 75.1%.Nuclear magnetic resonance T 2(transverse relaxation time)spectrum and pore size distribution curve have good consistency in morphology.The established evaluation method for quantitative characterization of pore size by nuclear magnetic resonance logging was applied to the fine evaluation of reservoirs,established the fine evaluation standard for classification of deep Shale gas reservoir combined with pore structure,realized the fine evaluation of reservoir,and can quickly and accurately determine the platinum target of horizontal wells,It provides technical support for efficient exploration and development of Shale gas and productivity prediction.
作者
何叶
郭宁
芮昀
宿鹤松
牛伟
姚亚彬
石阳志
HE Ye;GUO Ning;RUI Yun;SU Hesong;NIU Wei;YAO Yabin;SHI Yangzhi(Zhejiang Oilfield Company,CNPC,Hangzhou 310023,Zhejiang;Geological Research Institute,CNLC,Xi’an 710077,Shaanxi)
出处
《长江大学学报(自然科学版)》
2025年第5期38-47,共10页
Journal of Yangtze University(Natural Science Edition)
基金
中国石油天然气集团有限公司技术开发项目“海陆过渡相页岩气地震储层预测及测井评价技术研究”(2022-N/G-8428)
中国石油集团测井有限公司科学研究与技术开发项目“测井油藏与地质研究”(CNLC2022-08B02)。
关键词
页岩储层
全尺度孔径表征
气体吸附
高压压汞
核磁共振
储层精细评价
shale reservoir
full scale pore size characterization
gas adsorption
high-pressure mercury intrusion
nuclear magnetic resonance
fine reservoir evaluation
