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轻烃分析可以得到油层C9以前的各单体烃的浓度和相对百分含量。利用轻烃组分的沸点、溶解度、化学稳定性这些基本的物理化学性质,找出不同环境或不同储层性质条件下这些轻烃参数的变化规律,是用轻烃参数判别储层性质的理论依据和研究方法。经分析,采用轻烃组分的面积比值法,选取对水敏感并且定性容易的单体烃面积值做分子,选取比较稳定的单体烃的面积值做分母,即芳烃中苯,异构烷烃中的季碳22二甲基丁烷、22二甲基戊烷、33二甲基戊烷分别与环己烷的面积比;考虑到苯和季碳在原油中的含量较低,又选择了4个碳异构烷烃面积与4个碳环烷烃面积和的比值。通过轻烃谱图特征与参数比值的综合分析,确定了应用轻烃参数评价油水层的方法,利用该方法对Z地区5口井共15层进行评价。结果表明,轻烃解释结果与试油结论相吻合。
Light hydrocarbon analysis gives the concentration and relative percentages of each individual hydrocarbon prior to C9. Based on the basic physicochemical properties such as boiling point, solubility and chemical stability of light hydrocarbon components, the change law of these light hydrocarbon parameters under different environments or different reservoir properties is found out, which is the theory of judging the properties of the reservoir by light hydrocarbon parameters Basis and research methods. According to the analysis, using the area ratio method of light hydrocarbon components, we select the area of monomer hydrocarbon sensitive to water and qualitatively and easily as the numerator, choose the area of relatively stable monomer hydrocarbon as the denominator, namely benzene, isoparaffin In the quaternary carbon 22 dimethylbutane, 22 dimethylpentane, 33 dimethylpentane and cyclohexane area ratio; taking into account the low content of benzene and quaternary carbon in the crude oil, but also selected The ratio of the area of 4 carbon isoparaffins to the sum of 4 areas of carbocycloalkanes. Through the comprehensive analysis of the characteristics of light hydrocarbon spectrum and the ratio of parameters, the method of evaluating oil-water layer with light hydrocarbon parameters was determined. The method was used to evaluate 15 wells in 5 wells in Z area. The results show that the light hydrocarbon interpretation results are consistent with the conclusion of the test oil.