0 引言
1 地质背景
1.1 构造特征
图1 川中古隆起龙王庙组顶界北斜坡现今构造Fig.1 Present structure of the northern slope of the top boundary of the Longwangmiao Formation in the middle paleo-uplift of Sichuan |
1.2 构造演化
1.3 沉积特征
2 地貌高带控制颗粒滩相储层大面积分布
2.1 古颗粒滩体叠置大面积展布
2.2 成岩作用改造后形成颗粒滩相储集层
图6 川中古隆起北斜坡下寒武统龙王庙组颗粒滩储层岩性及储集空间特征(a)MX26井,4 931.04m,龙王庙组,鲕粒白云岩,粒间孔发育,蓝色铸体薄片,单偏光;(b)NC1井,5 659.34~5 659.57m,龙王庙组,褐灰色细晶云岩,顺层溶蚀孔发育;(c)MX56井,4 959.43~4 959.61m,龙王庙组,褐灰色细晶云岩,顺层溶蚀孔发育;(d)MX26井,4 814.81m,龙王庙组,砂屑白云岩,粒内溶孔发育,沥青半充填,蓝色铸体薄片,单偏光;(e)MX56井,4 964.35m,龙王庙组,细晶云岩,白云石以半自形—自行镶嵌,晶间溶孔发育,蓝色铸体薄片,单偏光;(f)MX56井,4 951.98m,龙王庙组,细晶云岩,晶间溶孔,沥青和白云石矿物充填,蓝色铸体薄片,单偏光;(g)MX56井,4 966.29~4 966.50m,龙王庙组,砂屑白云岩,孤立溶洞发育,直径3cm,沥青充填;(h)MX22井,4 943.88m,龙王庙组,细晶云岩,溶洞发育,大小3mm,沥青充填,蓝色铸体薄片,单偏光;(i)MX22井,4 943.88~4 945.71m,龙王庙组,泥晶白云岩,溶蚀孔沿裂缝发育,蓝色铸体薄片,单偏光 Fig.6 Lithology and reservoir space characteristics of granular beach reservoir of Lower Cambrian Longwangmiao Formation on the northern slope of middle paleo-uplift in Sichuan |