海拉尔盆地坡折带成藏类型与勘探突破方向

以层序地层学等理论为指导,以LANDMARK工作站的SEISWORK-3D地震解释、GEOPROBE地震岩性圈闭识别和储层预测等技术为手段,对海拉尔盆地贝尔断陷贝西斜坡主要勘探目的层系进行了层序、体系域的划分及层间扇体的刻画,统一了全区层序及体系域的界限。应用坡折带理论,根据形态特征将贝西斜坡的坡折带划分为反向断阶型、简单弯折型、多级断折型和多级坡折型4种类型。坡折类型不同,其油气藏的形成和富集特征也不同:反向断阶型有利于构造油气藏的形成和富集;断折型和坡折型有利于构造-岩性油气藏的形成;简单弯折型有利于岩性油气藏的发育。通过乌东斜坡带与贝西斜坡带的类比研究,提出了海拉尔盆地中坡折带为下步勘探的突破方向。

Reservoir-forming types and exploration targets in slope break belts of Hailaer Basin

Under the guidance of sequence stratigraphy theory,the sequences and system tracts have been classified, the interlayer fan bodies have been depicted, and the oundaries of the sequences and system tracts of the whole block for the main exploration target sequences have been unified in Beixi slope, Beier faulted-depression, Hailaer Basin，by means of SEISWORK-3D seismic interpretation at Landmark workstation, using the GEOPROBE seismic lithologic trap identification and reservoir prediction techniques.According to the theory of slope break belt, he slope break belt types based on their shapes in Beixi slope are classified into inverted fault step type, single curve break type, multiple-step fault break type, and multiple-step slope break type.Different slope break types might lead to variances of oil-gas reservoir formation and accumulation.Inverted fault step type is favorable for formation and accumulation of structural oil-gas reservoir;Fault break type and slope break type are in favor of forming structural-lithologic oil-gas reservoirs;Single curve break type is in favor of lithologic reservoir development.on the basis of correlation between Wudong slope belt and Beixi slope belt, the middle slope break belt in Hailaer Basin is brought forward as the breakthrough target in next exploration.