川东石炭系气藏类型及富集特征研究

Type and enrichment characteristics of Carboniferous gas reservoir in east Sichuan Basin

董才源 杨威 武赛军

中国石油勘探开发研究院廊坊分院，河北 廊坊 065007 中国石油勘探开发研究院，北京 100083

川东石炭系是四川盆地重要的勘探层系之一。基于气藏发育构造部位、圈闭类型及主要特征的不同，将川东石炭系已有气藏分为主体构造断垒型、潜伏高带断垒型和潜伏高带断鼻型等3类，预测了向斜悬挂式、向斜低缓微隆型和向斜地层岩性型这3种新的气藏类型，并总结了川东石炭系气藏分布模式；在分析6种气藏富集特征的差异性后，认为川东石炭系气藏富集优越性依序应为潜伏高带断鼻型、潜伏高带断垒型、向斜悬挂式、主体构造断垒型、向斜低缓微隆型、向斜地层岩性型，其中潜伏高带断鼻型富集优越性最好，是川东石炭系大型气藏勘探的重要目标，向斜悬挂式气藏富集优越性较好，可能是川东石炭系下一步勘探的最为有利气藏类型，向斜低缓微隆型和向斜地层岩性型也是川东石炭系勘探的潜力类型。

Carboniferous of east Sichuan Basin is one of the most important exploration layers. Based on structural position, trap type and main characteristics, existing gas reservoirs are divided into three types which are main structure-fault horst type, latent high zone-fault horst type and latent high zone-fault nose type. And three new types are thought to be existed named syncline-hanging type, syncline-low amplitude micro uplift type and syncline stratigraphic-lithological type. Enrichment characteristics difference of all 6 type gas reservoirs are analyzed and it is concluded that enrichment superiority order is latent high zone-fault nose type, latent high zone-fault horst type, syncline-hanging type, main structure-fault horst type, syncline-low amplitude micro uplift type and syncline stratigraphic-lithological type. Latent high zone-fault nose type is the best type which is the first target to prospect giant gas fields. Syncline-hanging type has a good sequence which maybe the important target for the next exploration. Syncline-low amplitude micro uplift type and syncline stratigraphic-lithological type are the potential types for the future exploration.

10.6056/dkyqt201405005