Study on Logging Response and Identification Method of Deep Coal Body Structure

Abstract

Aiming at the problem of coal structure identification of 8 # coal seam in Benxi Formation in Ordos Basin, this study is based on the core observation data to clarify the logging response characteristics of different coal structures; the multi-parameter intersection pattern is constructed based on the conventional logging curve to quantitatively divide the coal structure types. the results show that, The highlight image of homogeneous block native structure, The large time difference of the acoustic wave (>420μs/m), Neutron value (>54%); Cucut native structure electroimaging image highlight, Distribution of irregular dark short lines, spots, The large time difference of the acoustic wave (>420μs/m), Neutron value (<54%); Strianding native structure images highlighting containing dark color bands, The large time difference of the acoustic wave (<420μs/m), Wide neutron distribution range; The image of the broken coal is a "cow yoke", The irregular aggregation of dark spots shows the granular and even molecular structure, The three generally exist together, Increwith the fragmentation, The lower the resistivity, The wave-neutron map mainly judge the coal structure, This method effectively improves the identification accuracy of the coal body structure, Provide technical support for the efficient development of coal and rock gas.