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为了得到丰富的孔隙流体信息,要对含油岩心的原始新鲜样、盐水饱和样及氯化锰浸泡样进行分析。这3次分析的谱图有的谱峰位置一致,解释较容易;有的则发生错位,峰形变化也较大,解释比较困难。为了搞清这种变化的原因,对地面原油和孔隙流体在不同原油性质、不同润湿性、不同样品存放时间等条件下的弛豫特征分别进行了实验研究。结果表明,孔隙流体的弛豫特征受油质、润湿性及样品存放时间的影响,润湿性影响油峰和水峰的幅宽和面积,油质和样品存放时间影响谱峰的位置和幅度,在此基础上提出了不同孔隙结构的油水层判识方法,提高了油水层的判识准确率。
In order to obtain abundant pore fluid information, the original fresh samples of oil-bearing cores, saturated brine samples and manganese chloride immersion samples were analyzed. Some of the spectra of the three analyzes have the same peak positions, which is easier to explain; some are dislocated and the peak shapes change more so that interpretation is more difficult. In order to find out the reason of this change, the relaxation characteristics of ground crude oil and pore fluid under the conditions of different crude oil, different wettability, different sample storage time and so on were studied respectively. The results show that the relaxation characteristics of pore fluids are affected by oil quality, wettability and sample storage time. Wettability affects the width and area of oil peaks and water peaks, the locations of oil peaks and sample storage time On this basis, the oil-water layer identification method with different pore structures is proposed, which improves the accuracy of oil-water layer identification.