潞安矿区构造软煤展布规律及其对开发效果影响的探讨

Discussion on Distribution Law of Tectonic Soft Coal and its Effects on Development Effect in Lu'an Coal Mine Area

本文以潞安矿区为例,基于岩心、测井曲线建立了煤体结构识别图版,划分了已开发区煤体结构,总结了构造软煤展布规律,探讨了其对压裂及排采工程的影响。研究表明,构造软煤与硬煤测井相应特征差异大,具有深侧向电阻率降低、深浅电阻率幅差增大及井眼扩径等特征。利用识别图版能有效划分出构造软煤,划分结果显示,构造软煤带的平面展布特征主要受大断裂构造控制,而局部小断层、褶皱控制了软煤层的发育程度。在实际生产过程中随着软煤层厚度的增加单井产量呈现下降趋势;究其原因主要是常规压裂在软煤层中造缝效果差,且排采过程中易产出煤粉,堵塞裂缝,导致单井产能降低。

This dissertation used Lu'an coal mine area as an example,established the coal body structure identification charts based on core and logging data,classification of coal body structure of exploration zone,summarized the distribution rule of tectonic coal,discussed the effect of tectonic coal on fracturing and drainage engineering.Research shows that the difference of tectonic soft coal and hard coal logging corresponding characteristics,tectonic soft coal logging response is deep lateral resistivity decreasing、the difference between deep and shallow lateral resistivity values is increased and the enlargement of the well diameter.The indentification plate can effectively identify tectonic soft coal.The plane distribution characteristics of tectonic soft coal belt is mainly controlled by large fault structure,local small fault and fold control development degree of soft coal seam.Thickness of soft coal increased in gas production decreased in the actual production process;the main reason is the conventional racturing effect is poor in tectonic soft coal,and pulverized coal is easy to be produced in the process of discharging,which will easily lead to local congestion and this will beresulting in lower the production of single well.