岩性油气藏 ›› 2026, Vol. 38 ›› Issue (1): 2637.doi: 10.12108/yxyqc.20260103
马代兵1(
), 马文涛1(
), 韩文元1, 陈尚斌2, 郭星星1
MA Daibing1(
), MA Wentao1(
), HAN Wenyuan1, CHEN Shangbin2, GUO Xingxing1
摘要:
民和盆地窑街矿区具有较好的煤层气勘探潜力。利用钻井、测井以及实验测试资料,系统分析了民和盆地窑街矿区的煤层分布特征和生烃能力,明确侏罗系窑街组煤2层煤层气成藏条件及成藏模式,并预测了有利区。研究结果表明:①民和盆地窑街矿区受多期构造运动改造,形成“先逆后正”的控煤断裂;沉积相以河流—沼泽—湖泊相为主,煤2层呈“东厚西薄”带状分布,属中阶肥煤,纵向上热演化程度与镜质组随埋深增加而增加;煤岩以半暗—半亮型原生结构煤为主,孔隙较发育但渗透性较差。②研究区煤2层空气干燥基总含气的质量体积为6.10~8.78 cm3/g,均为7.53 cm3/g,甲烷质量体积为1.18~6.72 cm3/g,平均为4.46 cm3/g,气体成分以CH4、CO2以及N₂为主;纵向上随埋深增加、温压升高,CH4占比增大;平面上甲烷含量呈中部(海石湾向斜轴部)高值、向南北降低的分布格局。③研究区煤2层厚度较大,多大于10 m,且其具有较高的热演化程度(Ro达1.12%),奠定了煤层气富集的物质基础;在纵向上,增大的镜质组含量与降低的灰分含量优化了储集条件;炭质泥岩/泥岩顶底板、封闭水体、边界断裂带及海石湾向斜共同保障了煤层气的成藏。高热演化程度、气源充足、近向斜核部且远离断层的区域为地质Ⅰ类“甜点”区。
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