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酸解烃C2+/C1是轻烷烃类运移指标,荧光F360nm/F320nm反映芳烃类运移信息。解剖分析某油田C2+/C1、F360nm/F320nm等比值指标和C2+、C1、F360nm等丰度指标,并与同步荧光、甲烷碳同位素、吸附丝检测等指标有机关联,发现在油井、边缘井、干井处,这些指标强度特征不同:垂向上,各类井都显示出正向梯度变化和向上趋轻的结构梯,证实了烃类垂向微运移的客观存在;横向联井剖面的指标浓度(或强度)及变化梯度均显示出边缘井远大于油井、油井大于干井的分布特征,反映了运移效应在油藏外围处微弱而油水边缘处最强。在地球化学效应参数的数据结构方面,油井、边缘井、干井有各自的变量从聚现象和样本集合,而彼此间有显著差异;同时,自深部至浅部,样本都具有各自的相对稳定聚类归属。根据油气藏边缘与其内部数据结构的显著差异,可较好地解释油气藏上方地表普遍发育环状异常的机理,还可划分烃类渗逸背景区和异常渗逸区。图6表2参4(梁大新摘)
Acidolysis of hydrocarbons C2 + / C1 is a light hydrocarbon migration index, fluorescence F360nm / F320nm reflect aromatic transport information. Analyze the ratios of C2 + / C1, F360nm / F320nm and other C2 +, C1, F360nm and other indicators in an oilfield and correlate them with synchronous fluorescence, methane carbon isotope, Wells, the strength characteristics of these indicators are different: all vertical wells, all kinds of wells showed a positive gradient change and upwards light of the structural ladder, confirmed the objective existence of hydrocarbon vertical micro-migration; horizontal well cross-section indicator concentration (Or intensity) and gradient of variation show that the marginal wells are much larger than the wells and the wells are larger than the dry wells. This indicates that the migration effect is weak at the reservoir periphery and strongest at the oil-water edge. In the data structure of geochemical parameters, the oil wells, marginal wells and dry wells have their own variables aggregated from the polygons and the sample sets with significant differences from each other. Meanwhile, the samples have their relative stability from deep to shallow Clustering belongs. According to the significant differences between oil and gas reservoir margins and their internal data structures, the mechanism of circular anomalies generally developed above the reservoir can be well explained, and the hydrocarbon seepage background area and the anomalous seepage area can also be divided. Figure 6 Table 2 Reference 4 (Liang Daxin Abstract)