CAJ | 학술논문

从煤层气产出机理出发，分析了直接影响煤层气井产能的主要地质因素包括资源条件方面的含气量、厚度和产出条件方面的解吸压力、渗透率。在此基础上分析了影响和顺区块煤层气井产能的主控因素：区块东部X1井组煤层埋藏浅，受断层、陷落柱影响较大，保存条件差造成的储层压力低、含气量低是制约X1井组产能的主要因素。中部X2井组埋藏较深，保存条件较好，含气量高，具备高产的资源条件；低Langmuir压力造成的解吸压力低是井组高产的不利因素，受地应力影响的渗透率差异是X2井组井间产气量差异的主要原因。X2井组各井产气量与闭合压力呈负幂函数关系，产气量超过1000 m3/d的井均分布在闭合压力小于8 MPa的区域。保存条件较好的深部煤层应力低值区是和顺区块煤层气井高产的有利区域。
종매층기산출궤리출발，분석료직접영향매층기정산능적주요지질인소포괄자원조건방면적함기량、후도화산출조건방면적해흡압력、삼투솔。재차기출상분석료영향화순구괴매층기정산능적주공인소：구괴동부X1정조매층매장천，수단층、함락주영향교대，보존조건차조성적저층압력저、함기량저시제약X1정조산능적주요인소。중부X2정조매장교심，보존조건교호，함기량고，구비고산적자원조건；저Langmuir압력조성적해흡압력저시정조고산적불리인소，수지응력영향적삼투솔차이시X2정조정간산기량차이적주요원인。X2정조각정산기량여폐합압력정부멱함수관계，산기량초과1000 m3/d적정균분포재폐합압력소우8 MPa적구역。보존조건교호적심부매층응력저치구시화순구괴매층기정고산적유리구역。
Start from CBM output mechanism, analyzed the main direct geological controlling factors impacting CBM well capacity in?cluding methane content and thickness from resource condition;desorption pressure and permeability from output condition. On this ba?sis analyzed main controlling factors impacting CBM well capacity in the Heshun block. The X1 well group in the eastern block has shallowly buried coal seams, largely impacted by faults and subsided columns, poor preserving conditions has caused low reservoir pres?sure and methane content, thus the main factor to restrict X1 well group capacity. Middle part X2 well group has deeply buried coal seams with good preserving condition caused high methane content provided with high yield resource condition. Low Langmuir pressure caused low desorption pressure is disadvantage factor to impact high yield of the well group, permeability difference from crustal stress is the primary cause of different CBM yields between wells in the well group. CBM yield of each well in the X2 well group presents neg?ative exponential relationship with closure stress, wells with CBM yield over 1 000 m3/d are all in the area with closure stress less than 8 MPa. Deep part of coal seams with low stress and better preserving condition is the favorable area to high CBM yield in Heshun block.