过去十年中,在科罗拉多州的最重要的找矿活动是瓦腾堡气田的发现及开发(图1、2)。瓦腾堡气田位于丹佛市以北,横跨盆地轴部。估算储量为1.3×10~(12)英尺~3,储集层为白垩统“致密”的 J 砂岩(三角洲前缘—上部滨岸相),储层面积超过60万英亩,深7600—8400英尺,纯油层厚度10—50英尺,孔隙度8—12%,渗透率0.5—0.005毫达西,因采用水力压裂方法增加井孔周围地层的渗透性,使该气田具有工业生产价值。 The most important prospecting activity in Colorado over the past decade was the discovery and development of the Württemberg gas field (Figures 1 and 2). Watertown gas field is located north of Denver, across the basin axis. The estimated reserves are 1.3 × 10 ~ (12) ft 3 and the reservoir is Cretaceous “tight” J sandstone (delta front - upper bank) with over 600,000 acres of reservoir area and a depth of 7600- 8400 ft, pure oil layer thickness of 10-50 ft, porosity of 8-12%, and permeability of 0.5-0.005 md. The hydraulic fracturing method has been used to increase the permeability of the formation around the borehole so that it has industrial production value.