为了深入挖掘断层发育特征对煤层气开发的影响机理，揭示其控产方式，以沁水盆地南部柿庄地区3号煤层为研究对象，分析了不同规模及组合形式的正断层对煤储层物性、工程效果和排采工作的影响;选取正断层控制下的含气量、煤体结构、渗透率、井径扩大率、破裂压力以及日产水量6个因素，采用灰色关联法分析了不同因素对产气量影响的主次关系，进而揭示了正断层对产气的主要控制方式。结果表明:正断层对产气的影响存在一定距离范围，该范围受控于断层的规模和上下盘位置，寺头断层上盘控制范围约为300 m，下盘约为250 m，F11断层上盘控制范围约为250 m，下盘约为200 m，由于正断层上盘为断层形成过程中的主动盘，沿断层面的剪应力大于下盘，造成上盘的影响范围大于下盘。随着距断层距离的减小，正断层所产生影响不断增大，影响特征为含气量和破裂压力逐渐减小，孔裂隙发育程度和井径扩大率逐渐增大，煤体结构更加破碎，压裂曲线形态更加复杂断层控制范围内煤层气井产水量普遍高于平均值。分析认为，正断层是在构造应力的作用下形成的，在断层面附近存在应力集中带，位于该区域的煤层受应力集中作用的影响，发生明显的变形破裂，力学强度大幅度降低，随着距断层距离的增大，应力作用强度也逐渐降低，其变形破裂也逐渐减弱;同时，正断层周围一般发育张性裂缝，随着距离的增加进而转变为压扭、张扭性裂隙，其张开度较低，到达一定的距离后，裂缝转为张性。故造成距离正断层越近，地质条件更加复杂，工程实施难度越大，产气效果一般。并且正断层主要通过控制渗透率、含气量以及沟通含水层来影响煤层气井日产气量，若要实现断层附近煤层气的高效开采，应优先关注这些参数是否异常。

To understand the influence mechanism of fault development characteristics on the development of coalbed methane (CBM) and reveal its production control mode,the No. 3 coal seam in Shizhuang Block,Southern Qinshui Basin was taken as the research object and the influence characteristics of normal faults of different scales and combi- nation forms on the physical properties,engineering effect and drainage of coal reservoirs were analyzed. Six factors such as gas content,coal structure,permeability,well diameter expansion rate,fracture pressure and daily water pro- duction under the control of normal fault were selected,and the primary and secondary relations of different factors on gas production were analyzed using grey correlation method,and then the main control methods of normal faults on gas production were revealed. The results show that the influence of normal fault on gas production is controlled by its own nature,scale and location,and there is a certain distance range. The control range of upper wall of Sitou fault is about 300 m,and the control range of the lower wall of Sitou fault is about 250 m. The control range of the upper wall of F11 fault is about 250 m,and the control range of the lower wall of the F11 fault is about 200 m. As the upper plate of the normal fault is active disk,the shear stress along the fault plane is greater than that of the lower disk,so that the influ- ence range of the upper disk is larger than that of the lower disk. With the decrease of the distance from the fault,the influence of the normal fault increases,which is characterized by the decrease of gas content and fracture pressure,the increase of pore fracture development degree and well diameter expansion rate,the more broken coal body structure, and the more complex fracture curve shape. It is considered that the normal fault is formed under the action of tectonic stress,and there is a stress concentration zone near the fault plane. Under the influence of stress concentration,the coal seam in this area is obviously deformed and ruptured,and the mechanical strength of the coal seam in this area decrea- ses greatly. With the increase of the distance from the fault,the stress action intensity decreases gradually,and the de- formation fracture also weakens gradually. At the same time,the tension cracks are generally developed around normal faults,and then change into the compression and torsional fractures with the prolongation of distance. The opening de- gree of tension cracks is low,and after reaching a certain distance,they become tensioned. Therefore,the closer it is to the normal fault,the more complex the geological conditions are,the more difficult it is to carry out the project,and the worse the gas production is. The normal fault mainly affects the daily gas production of coalbed gas wells by controlling per-meability,gas content and communicating aquifers. In order to achieve the efficient exploitation of CBM near the fault,some considerations should be paid to whether these parameters are abnormal or not.