Beneficial CBM area prediction based on structural elemental quantitative cluster classification
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摘要: 为优选煤层气构造要素富集区，精细划分开发尺度下构造控气有利区块，以沁水盆地西南部永乐南区块为例，细分构造表征要素，量化构造要素指标，提出趋势面迭代法表征不同程度构造变形、模糊聚类分级、以及要素二分进行煤层气构造有利区优选的方法。基于地震地质综合解释成果，从构造变形、断裂系统和埋深3个方面，对研究区2号和9+10号煤层进行构造要素定量表征，采用Q型聚类法对构造要素的表征指标进行定量分级，在此基础上，以影响煤层气富集、保存的构造地质规律为指导，采用要素二分法划分得到单要素控气有利和不利区，最终综合单要素控气有利区，得到构造影响下煤层气富集的最有利、较有利、较不利和不利四类区域，并通过煤田钻孔瓦斯含量数据得以验证。Abstract: In order to select optimally the CBM-enriched area of structural elements and delicately divide the advantageous blocks of CBM structural control under the development scale, this paper takes the Yongle south block in the southwest of Qinshui Basin as an example, subdivides the structural characterization elements and quantifies the indicators of structural elements, and puts forward the method of trend surface iteration to characterize different degrees of structural deformation, fuzzy clustering classification and element dichotomy to optimize the favorable area of CBM structural control. Based on the comprehensive interpretation results of seismic geology, the quantitative characterization of structural elements of No.2 and No.(9+10) coal seams in the study area is carried out from three aspects of structural deformation, fault system and burial depth. The quantitative classification of structural elements is carried out by Q-type clustering method. On this basis, the single element is divided by using factor dichotomy method under the guidance of the structural geological law affecting the enrichment and preservation of coalbed methane. The favorable and disadvantageous areas for gas control are finally synthesized into four types: the most favorable, the more favorable, the more disadvantageous and the disadvantageous under the influence of CBM enrichment structure, which are verified by the gas content data of coal drilling holes.
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Keywords:
- coalbed methane /
- geological structure /
- favorable area /
- fuzzy clustering /
- Qinshui Basin /
- Yongle south block
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