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早期了解油藏润湿情况对选择油田最佳开发方案至关重要。不够重视润湿条件(如假定为水湿性)可能导致原油地质储量评价错误和出现意想不到的动态特征(如水淹)。本文描述了根据核磁共振数据确定岩石润湿性的一种新方法。该方法是基于与岩石表面直接接触的实验流体存在额外核衰减的事实。假定外部因素忽略不计或实验之间无变化,撇开其综合价值,原油衰减时间的减少一般称为定量润湿性指示。通过核磁共振响应的精细模拟,这个概念进一步发展成为定量润湿性指数。该方法需要对两种地层流体(即盐水和原油)进行核磁共振测量,包括扩散作用的多重采集图像使解释更有说服力。通过岩心数据与标准润湿性实验对比,基于核磁共振的新方法得到了广泛的验证。核磁共振测井应用正在进行中。
Early understanding of reservoir wetting is crucial to the optimal development of a chosen oilfield. Insignificance of wetting conditions, such as wettability, can lead to incorrect assessment of crude oil geological reserves and unexpected dynamic characteristics such as flooding. This article describes a new method for determining rock wettability based on NMR data. This method is based on the fact that there is an extra nuclear attenuation of the experimental fluid in direct contact with the rock surface. Assuming that external factors are negligible or that there is no change between experiments, aside from their combined value, the reduction in crude decay time is generally referred to as a quantitative wetness indicator. This concept was further developed into a quantitative wettability index by a fine simulation of the nuclear magnetic resonance response. The method requires nuclear magnetic resonance measurements of both formation fluids (ie, brine and crude oil), and multiple acquisitions of images that include diffusion to make interpretation more persuasive. By comparing core data with standard wettability experiments, a new NMR-based approach has been extensively validated. Nuclear magnetic resonance logging applications are in progress.