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鄂尔多斯盆地姬塬地区延长组长9段储集层地层水矿化度变化范围大,油水分布规律复杂,油水层界限模糊,易造成部分油层的错判或漏判。为解决该问题,应用轻烃录井技术,结合近几年的生产实践,以长9段已试油的32口井80个试油层的不同储集层轻烃谱图特征为统计分析对象,形成了油层、油水同层和水层谱图特征以及识别标准;在此基础上,结合反映油、水特征的敏感参数分析,通过参数优选,建立了甲苯与正庚烷比值(Tol/nC7)和正庚烷与甲基环己烷比值(nC7/MCYC6)轻烃录井解释评价图板。生产实践表明,轻烃录井谱图特征识别与解释评价图板相结合,可实现该地区延长组长9段储集层的有效解释评价。
The range of salinity of formation water in the 9th member reservoir of Yanchang Formation in Jiyuan area in the Ordos Basin is large, the distribution law of oil and water is complex, and the boundaries of oil and water reservoirs are fuzzy, which may lead to misjudgment or omission of some reservoirs. In order to solve this problem, the light hydrocarbon logging technology was applied. According to the production practice in recent years, the light hydrocarbon spectra of 80 reservoirs in 32 wells in Chang 9 section were used as statistical analysis targets. Based on the above analysis, the sensitivity parameters of oil and water were analyzed. Through the optimization of parameters, the ratio of toluene to n-heptane (Tol / nC7) was established. And n-heptane to methylcyclohexane ratio (nC7 / MCYC6) light hydrocarbon logging interpretation evaluation panels. Production practice shows that the combination of light hydrocarbon logging features identification and interpretation and evaluation plates can effectively explain and evaluate the extension of the 9 member reservoirs in the area.