摘要
柴达木盆地南八仙油气田N22—N1油气藏储层分布不稳定,横向上岩性变化大,进行地层对比和细分层工作存在着很大的困难;油气藏无统一的油气水界面和统一的压力系统,油气性质及油气比也存在较大差异,用常规的处理手段和处理程序无法计算和预测储层的产油气比例,导致解释结果符合率低。为此,采用CONGAS凝析油气藏解释评价软件,根据三孔隙测井曲线对天然气的响应特征,通过计算三孔隙测井响应方程,计算出地面条件下的气油比和可动油气密度等参数,将计算的油气饱和度与气油比进行交绘,形成综合测井解释图版。通过对该图版的综合分析,结合储层物性,得到N22—N1油气藏储层油、气、水层的综合定量区分解释标准。应用该标准的综合解释符合率达到94.8%。
The N22-N1 reservoirs in the Nanbaxian oil and gas field of Qaidam basin are featured by in unstable distribution,large lateral variation of lithology,challenging stratigraphic correlation and subdivision.The reservoirs have no unified water/oil/gas contact surface or pressure system,and the oil/gas properties and oil/gas ratio also change greatly,thus conventional processing methods and procedures are not applicable to the calculation and estimation of oil/gas ratio.To solve this problem,we selected CONGAS condensate oil/gas reservoir evaluation software to establish a tri-porosity logging response equation based on the tri-porosity logging response of natural gas.It was used to calculate the gas/oil ratio and movable hydrocarbon density.The calculated oil/gas saturation and gas/oil ratio were crossplotted to obtain a comprehensive logging interpretation chart.Comprehensive qualitative interpretation criteria for oil,gas and water layers in the N22-N1 reservoirs were defined through comprehensive analysis of the chart and in combination with the physical properties of the reservoirs.The interpretation coincidence rate reaches 94.8 % by using comprehensive qualitative interpretation criteria.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2009年第7期12-15,共4页
Natural Gas Industry
关键词
南八仙油气田
凝析油气田
CONGAS软件
测井曲线
孔隙度
油气层识别
Nanbaxian oil and gas field,condensate gas field,CONGAS software,logging curve,porosity,oil/gas layer identification
