针对复杂岩性储集层孔隙结构多样、渗流机理复杂,常规方法难以准确求取渗透率难题,深入分析经典核磁共振渗透率计算模型的局限性,明确孔隙结构和孔隙度是渗透率的主控因素,提出先利用核磁共振T2（横向弛豫时间）谱进行孔径组分划分,然后根据不同组分对渗透率的贡献差异计算渗透率的新方法。基于该研究思路,以中东A油田生物碎屑灰岩储集层为例,依据压汞毛管曲线形态及其变化的拐点位置,确定了粗、中、细、微孔喉4类组分的分类标准,并转化为核磁共振横向弛豫时间标准。基于核磁共振测井资料精细计算了4类孔径组分的占比,根据其对渗透率的不同贡献,建立了基于多组分孔隙分量组合的核磁共振渗透率计算新模型。通过区块应用对比,新模型的计算精度明显高于传统方法。图14表4参15
韩玉娇
,
周灿灿
,
范宜仁
,
李潮流
,
袁超
,
丛云海
. 基于孔径组分的核磁共振测井渗透率计算新方法——以中东A油田生物碎屑灰岩储集层为例[J]. 石油勘探与开发, 2018
, 45(1)
: 170
-178
.
DOI: 10.11698/PED.2018.01.19
It is difficult to accurately obtain the permeability of complex lithologic reservoirs using conventional methods because they have diverse pore structures and complex seepage mechanisms. Based on in-depth analysis of the limitation of classical nuclear magnetic resonance (NMR) permeability calculation models, and the understanding that the pore structure and porosity are the main controlling factors of permeability, this study provides a new permeability calculation method involving classifying pore sizes by using NMR T2 spectrum first and then calculating permeability of different sizes of pores. Based on this idea, taking the bioclastic limestone reservoir in the A oilfield of Mid-East as an example, the classification criterion of four kinds of pore sizes, coarse, medium, fine and micro throat, was established and transformed into NMR T2 standard based on shapes and turning points of mercury intrusion capillary pressure curves. Then the proportions of the four kinds of pore sizes were obtained precisely based on the NMR logging data. A new NMR permeability calculation model of multicomponent pores combinations was established based on the contributions of pores in different sizes. The new method has been used in different blocks. The results show that the new method is more accurate than the traditional ones.
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