黄骅坳陷北大港地区浅层天然气识别与分布特征

Recognition and Distribution of Shallow Natural Gas in Beidagang Zone of Huanghua Depression

通过对国内外有关资料的分析,尤其是对加拿大Alberta盆地浅层天然气开发资料的分析,认为含油气盆地内浅层天然气资源丰富,具有非常大的勘探开发潜力。以黄骅坳陷北大港构造带港东油田和港西油田为例总结出适合北大港地区浅层气测井识别方法,包括声波时差与中子伽马曲线重叠法、补偿中子—补偿密度曲线重叠法等。指出该区浅层气宏观上主要沿港东断鼻构造的高部位分布,曲流河道沙坝相、河道、废弃河道等砂岩体是浅层气的主要储集体,就单个气藏而言气层的分布主要受岩性控制,没有统一的气水界面,断层与岩性体单砂体形成各自的油、气、水系统,纵向呈现油、气、水交错出现的现象。

Documents about shallow natural gas, especially in Alberta basin of Canada, suggest that the shallow gas resources are abundant in the petroliferous basins, with great potential for exploration and development. Here we summarized the logging identification （overlay technique of DTL and NGL, CNL and CDL）of shallow natural gas in the Beidagang zone based on the examples of Gangdong oilfield and Gangxi oilfield in Beidagang zone of Huanghua depression. In macroscopic area, the shallow gas is distributed along the structural high position of Gangdong fault nose as well as sand bar, channel, abandoned channel and other sandstone body in meandering river. But the single shallow gas reservoir is controlled by lithol ogical change. Most gas reservoirs have different gas/water boundary. The disparate water/oil/gas system which was formed by fault and lithologic lenticular occurs, with the interleaving distribution of water/oil/ gas in vertical.