Quantitative assessment of gas washing of oils in the Tazhong area of the Tarim Basin, Northwest China
Quantitative assessment of gas washing of oils in the Tazhong area of the Tarim Basin, Northwest China
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DOI：
10.1007/s11430-008-0142-0
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
Chupeng Yang;Ansong Geng;Z. Liao;Yongge Sun;Lühui Zhang
中科院分区：
文献类型：
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作者：
Chupeng Yang;Ansong Geng;Z. Liao;Yongge Sun;Lühui Zhang
塔里木盆地塔中地区存在天然气冲刷作用，但对其定量评价尚未见报道。本文根据68种原油的气相色谱数据和黑油与凝析油混合实验结果，讨论了气洗分馏作用对该区的影响。结果表明，气洗分馏强度总体上由北方向南方递减，纵向上由深层向浅层递减。该区天然气的洗油分馏作用主要受断裂系统的控制，正构烷烃质量亏损的增加与断裂的数量和规模呈正相关。气洗分馏作用似乎影响了烃类的性质，因此，原油的多样性明显地受气洗作用的控制。此外，该区含蜡原油的产出可能是气洗、混合充填和运移分馏等多种因素共同作用的结果。
Gas washing has been known in the Tazhong area of the Tarim Basin, but its quantitative assessment has not yet been reported. Here the influence of gas washing fractionation in the area was discussed based on the gas chromatogram data of 68 oils and the results of the mixing experiments of a black oil and a condensate. The results show that the intensity of gas washing fractionation decreased generally from northern to southern part and vertically from deep reservoirs to shallow reservoirs. The gas washing fractionation was mainly controlled by fault systems in this area, with the increase ofn-alkane mass depletion positively correlated to the number and scale of faults. Gas washing fractionation appears to have affected the hydrocarbon property, and as a result the diversity of the crude oils is markedly controlled by gas washing. In addition, the occurrence of waxy oil in this area may be resulted from multiple factors including gas washing, mixed filling and migration fractionation.