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松辽盆地北部安达凹陷中基性火山岩储层孔隙结构及渗流机理研究
Pore structures and seepage mechanisms of intermediate-basic volcanic reservoirs in Anda Sag, northern Songliao Basin
屈 洋1 刘 庆2
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DOI:
作者单位:1. 中国石油大庆油田有限责任公司勘探开发研究院 2. 中国石油大庆油田有限责任公司采油二厂地质大队
中文关键字:安达凹陷 中基性 早白垩世 火山岩储层 压汞实验 孔隙结构 渗流 水锁
英文关键字:Anda sag; Intermediate-basic; Early Cretaceous; Volcanic reservoir; Mercury injection experiment; Pore structure; Seepage; Water lock
中文摘要:松辽盆地北部安达凹陷白垩系下统营城组中基性火山岩储层渗流机理复杂。为高效合理开发此类天然气藏,应用恒
速压汞、核磁共振、CT、相渗等多种岩心实验分析技术,综合描述中基性火山岩储层孔隙结构特征,按实验参数特征划分孔喉类
型,对之进行分类评价;通过气水相渗实验解析水锁现象,并结合单井产能对比提出开发调整建议。研究结果表明:①安达凹陷
中基性火山岩储层孔隙结构大体可划分为3 类,其中Ⅰ类粗喉型较少,主要以Ⅱ类细喉型和Ⅲ类微喉型为主,表现为孔喉发育差、
分布不均,裂缝不发育、连通性差,排驱压力高,这类储层整体储集性能差,直井稳产能力差,建议采用水平井开发及配备大型
缝网压裂改造;②岩心内部气水两相渗流区窄,气驱水效率低,开发后期底水进入储层后极易形成水锁现象,需合理控制生产压
差和产气量,最大范围内延长单井的无水采气期。

DOI: 10.12055/gaskk.issn.1673-3177.2018.01.011




英文摘要:The intermediate-basic volcanic reservoirs of Lower Cretaceous Yingcheng Formation, Anda sag, northern Songliao Basin,
reveal complex seepage mechanisms. To develop such reservoirs efficiently and properly, the pore structure characteristics were described
comprehensively by using multiple core analysis, e.g. constant-rate mercury injection, NMR, CT, and relative permeability.
Then, pore throats were classified and evaluated. The phenomenon of water lock was analyzed by means of gas/water relative permeability
experiment, and some suggestions on development adjustment were put forward based on the comparison results of single
well productivity. As concluded, the pore structures of these reservoirs can be generally divided into three types: Ⅰ, Ⅱ and Ⅲ. Type
Ⅰ(coarse throat) is less, while Type Ⅱ(fine throat) and Type Ⅲ (micro throat) are dominant. The latter two are characterized by poor
and uneven development of pore throats, poor connectivity due to no fractures, and high displacement pressure. Moreover, they have
poor storage capacity and cannot ensure stable productivity in case of vertical well. It is recommended to develop them via horizontal
wells in conjunction with large-scale network fracturing stimulation. Moreover, the gas-water two-phase flowing zone inside the core
is narrow, so gas driving water efficiency is low and water lock may appear when bottom water flows into the reservoirs in the late
stage. It is necessary to control production pressure difference and production rate reasonably so as to extend the water-free gas production
period of single well as long as possible.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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