改进的三相Biot模型在水合物地球物理测井评价中的研究

发布时间：2018-04-25 12:39

本文选题：天然气水合物 + 测井评价　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：天然气水合物作为未来人类理想的替代能源,其储量评价和勘探开发一直是人们关注的热点与难点,解决这个问题的关键在于建立适用于含水合物地层的岩石物理模型。本文在前人研究的基础上,旨在建立更优化的水合物物理模型,选题具有理论意义和实用价值。本文基于大洋钻探计划(ODP)204航次公开发布的测井数据,针对应用广泛且具有坚实理论基础的三相Biot模型展开研究。通过对三相Biot方程的研究,提出其本质是对纵波速度、横波速度、密度、孔隙度、水合物饱和度和固结系数这六个量之间自洽性的表达。基于这个认识,本文通过修正模型序参量r,把传统的三相Biot模型写成了固结系数的显示形式,建立了改进的三相Biot模型。改进的模型可以直接计算出固结系数和水合物饱和度,避免了传统三相Biot模型由于拟合参数而带来的误差。本文利用改进的三相Biot模型探讨了固结系数对反演水合物饱和度结果的影响。计算结果显示,部分地层固结系数20%的偏差,会带来水合物饱和度40%甚至更大的误差,表明了模型改进的合理性与必要性。进一步,通过与核磁共振-孔隙度模型和经典的Archie公式计算水合物饱和度的结果进行对比,改进的三相Biot模型显示了更好的应用效果。改进的三相Biot模型拓展了传统三相Biot模型的应用范围,除了反演水合物的饱和度,还可以预测和评价测井纵波速度、横波速度、密度和孔隙度数据。本文论述了模型预测或评价的原理和方法,并实际应用于评价204航次已有的测井数据。结果显示,在水合物稳定赋存区域,改进的三相Biot模型具有较好的预测和评价能力,反演精度取决于模型计算所使用数据的精确度。
[Abstract]:As the ideal alternative energy in the future, the evaluation of gas hydrate reserves and exploration and development have been the hot and difficult issues. The key to solve this problem is to establish a rock physical model suitable for hydrate formation. On the basis of previous studies, this paper aims to establish a more optimized hydrate physics model, and the topic is of theoretical significance and practical value. Based on the well logging data released publicly by ODP / ODP, the three-phase Biot model, which is widely used and has a solid theoretical foundation, is studied in this paper. Through the study of the three-phase Biot equation, it is proposed that the essence of the equation is the expression of self-consistency among the six variables, namely, the longitudinal wave velocity, the shear wave velocity, the density, the porosity, the hydrate saturation and the consolidation coefficient. Based on this understanding, the traditional three-phase Biot model is written into the display form of consolidation coefficient by modifying the order parameter r of the model, and an improved three-phase Biot model is established. The improved model can directly calculate the consolidation coefficient and hydrate saturation and avoid the error caused by fitting parameters in the traditional three-phase Biot model. In this paper, the effect of consolidation coefficient on the inversion of hydrate saturation is discussed by using the improved three-phase Biot model. The calculation results show that the deviation of partial formation consolidation coefficient of 20% will lead to 40% or even greater error of hydrate saturation, which indicates the rationality and necessity of model improvement. Furthermore, the improved three-phase Biot model is compared with the results of the NMR porosity model and the classical Archie formula to calculate hydrate saturation. The improved three-phase Biot model shows a better application effect. The improved three-phase Biot model extends the application range of the traditional three-phase Biot model. In addition to the inversion of hydrate saturation, the log P-wave velocity, shear wave velocity, density and porosity data can also be predicted and evaluated. This paper discusses the principle and method of model prediction or evaluation, and it is applied to evaluate the logging data of 204 voyage. The results show that the improved three-phase Biot model has good prediction and evaluation ability in the stable hydrate occurrence area, and the inversion accuracy depends on the accuracy of the data used in the model calculation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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