摘要
构建准噶尔盆地吉木萨尔二叠系芦草沟组页岩油有效含油性及可动性分级评价标准,甄选出含油性好、可动油饱和度高的优质甜点是页岩油高效开发的关键。开展页岩油甜点富集机理、不同流体赋存状态与储层孔隙结构关系的分析研究。研究结果表明,吉木萨尔二叠系芦草沟组页岩油甜点具有混积型页岩油特征,甜点具有弱运移-滞留型的成藏模式;甜点的孔隙结构主要受粒级及成岩作用溶蚀强度的控制,甜点的含油性、可动性与储层孔隙结构相关,明确了页岩油不同流体赋存状态与分布特征;基于核磁共振实验的页岩油弛豫机理与弛豫模式奠定了吸附油、游离油孔隙度和含水性定量表征的物理基础,构建了核磁共振T2谱分簇计算页岩油不同赋存状态流体饱和度的定量表征技术。计算的可动油饱和度与水平井产能、稳定含水率具有较好的一致性,为页岩油水平井井位优选、试采方式、产能评价提供了依据。
It is the key to develop shale oil efficiently to construct the grading evaluation standard of effective oil content and mobility of Permian Lucaogou formation shale oil in Jimsar,Junggar basin,and to select high-quality sweet spot with good oil content and high movable oil saturation.The enrichment mechanism of shale oil sweet spot,the relationship between different fluid occurrence states and reservoir pore structure are analyzed and studied.The results show that the sweet spot of Permian Lucaogou formation shale oil in Jimsar has the characteristics of mixed shale oil,and the sweet spot has a weak migration-retention reservoir-forming model.The pore structure of sweet spot is mainly controlled by grain size and dissolution strength of diagenesis,and the oil content and mobility of sweet spot are related to the pore structure of reservoir,which defines the occurrence and distribution characteristics of different fluids in shale oil.Based on the relaxation mechanism and relaxation mode of shale oil in nuclear magnetic resonance(NMR)experiment,the physical foundation of quantitative characterization of adsorbed oil,free oil and water content was established,and the quantitative characterization technology of T2 NMR spectrum clustering to calculate fluid saturation of shale oil in different occurrence states was constructed.The calculated movable oil saturation is in good agreement with the productivity and stable water content of horizontal wells,which provides a basis for shale oil horizontal well location optimization,trial production mode and productivity evaluation.
作者
蔺敬旗
曹志锋
王先虎
刘洁梨
徐睿
董旭龙
LIN Jingqi;CAO Zhifeng;WANG Xianhu;LIU Jieli;XU Rui;DONG Xulong(Xinjiang Branch,China National Logging Corporation,Karamay,Xinjiang 834000,China)
出处
《测井技术》
CAS
2022年第6期750-756,共7页
Well Logging Technology
基金
中国石油天然气集团有限公司攻关项目“页岩油测井关键技术研究与应用”(2019E-2603)。
关键词
吉木萨尔页岩油
甜点
赋存状态
核磁共振
水平井
Jimsar shale oil
sweet spot
occurrence state
nuclear magnetic resonance
horizontal well
