用热解和气相色谱技术确定碳酸盐岩储集层油水界面

Determining oil water contact in carbonate reservoir using GC and Rock Eval.

对塔里木盆地ＹＨ７Ｘ１井寒武系碳酸盐岩储集层岩心样品的热解和岩心抽提物的气相色谱分析表明：油层样品的热解含油率与其储集空间的发育程度密切相关，储集空间发育处含油率可能很高，储集空间不发育处含油率很低（甚至为０），正构烷烃碳数分布范围较宽（１５至３０以上），且正构烷烃丰度相对较高；而水层样品的热解含油率普遍较低，正构烷烃碳数分布范围较窄（１５至２５），且正构烷烃丰度相对较低，碳数高于２５的正构烷烃丰度几乎为０。热解分析与气相色谱技术相结合，有助于预测碳酸盐岩油藏的原油性质和确定其油水界面。图１表１参６（梁大新摘）

The Rock Eval and GC analyses of the reservoir rocks sampled from the Cambrian carbonate formation in Well YH7X 1 indicated that in oil intervals oil saturations are corresponding to the porosity of the rocks where oils located, i. e. they may be high in high porosity intervals and may be low, even zero, in low porosity intervals while the n alkanes range from C 15 to C 30+ and their relative abundances are high. But in water intervals the oil saturations are almost always low, the n paraffins range only from C 15 to C 25 and their relative abundances are low, the abundance of C 25+ n paraffins are almost equal to zero. So, the oil water contact can be determined by the different characteristics of water and oil intervals.