摘要
针对纵波阻抗对大庆长垣老区某些区块砂泥岩区分不明显的问题,结合自然电位曲线反映储层砂岩比较敏感的特性,建立了自然电位高精度反演方法及流程,对其中的自然电位基线校正、井震标定、关键参数优选等重要环节进行严格的质量控制,消除了相对严重的基线＂漂移＂现象,提高了储层砂体的识别精度。利用该方法对长垣老油田A区块进行砂体识别及剩余油挖潜应用,通过研究区均匀分布的后验井检验,1~2 m砂体符合率达到73%,2~3 m砂体符合率达到83%,3 m以上砂体符合率达到90%。对研究区内的9口油井进行补孔措施,已累计增油近14 730 t（截至2014年年底）,在提高储层精细描述精度及指导开发方案调整方面见到了明显效果,展现了良好的应用前景。
The sandstone and mudstone cannot be clearly distinguished by P-wave impedance in some blocks of Daqing Changyuan maturing oilfield.A natural potential high-resolution inversion method is proposed on the basis of natural potential to reservoir sandstone. The natural potential baseline correction,well-seismic calibration and key-parameter optimization are strictly controlled to eliminate baseline'drift'and improve reservoir sandbody identification accuracy. This technology is used to identify reservoir sandbody and remaining oil in Block A of Changyuan maturing oilfield. The test of even-distributed posterior wells shows that the agreement rate of sandbody with 1-2 m thickness reaches 73%,the agreement rate of sandbody with 2-3 m thickness reaches 83% and the agreement rate of sandbody with thickness exceeding 3 m reaches 90%. Reperforation is implemented for9 wells in the study area and the cumulative oil increment( by the end of 20 144) nearly reaches 14 730 t. This technology is efficiently applied to improve reservoir characterization resolution and guide the adjustment of development program,showing a favorable application prospects.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第2期101-104,156,共4页
Special Oil & Gas Reservoirs
基金
国家"十二五"重大专项课题"井震结合油藏精细结构表征技术"(2011ZX05010-001)
关键词
反演
自然电位
储层预测
大庆长垣
inversion
natural potential
reservoir prediction
Daqing Changyuan
