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随着勘探开发步伐的不断加快,开发周期不断缩短,取心井越来越少,钻井新工艺的发展使岩屑越来越细,甚至呈粉尘状,给现场油气显示描述带来很大困难。针对上述情况,通过研究利用核磁共振测量孔隙度的方法,以核磁共振测量含油饱和度理论为依据,进行分层位(延安组和延长组)实验,建立了岩屑样品含油丰度测量方法。实验表明,各层位核磁共振含油丰度信号与岩屑实际含油量呈明显线性关性,并且绝对相关性达0.99以上。但不同层位其相关性公式不同,油质越轻相关性公式的斜率越大;只要通过实验建立测量区相关性公式,就能在区域内推广应用。
With the continuous acceleration of exploration and development, the development cycle has been continuously shortened and fewer coring wells have been drilled. The development of new drilling technology has made the rock fragments smaller and finer, even dusty, which brings great difficulties to on-site oil and gas display and description. In view of the above situation, the method of measuring porosity by NMR was studied, and based on the theory of oil saturation measured by NMR, experiments of stratified sites (Yan’an and Yanchang Formation) were carried out to establish a method for measuring the oil content of cuttings samples. Experiments show that the NMR signals at all layers have a clear linear relationship with the actual oil content of cuttings, and the absolute correlation is above 0.99. However, the correlation formulas of different layers are different. The lighter the correlation coefficient, the greater the slope of the formula is. So long as the correlation formula of the measurement area is established experimentally, it can be popularized and applied in the area.