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莺歌海盆地为典型的伸展—转换型盆地,其独特的地质条件决定了天然气具有差异输导特征,这种差异输导体现在盆地尺度、区带尺度和输导体尺度上,中央底辟构造带为泥—流体底辟树型输导系统,深部天然气沿底辟断裂垂向远距离运移到底辟顶部及其周缘的浅层及中深层砂体中成藏。输导体主要以垂向断裂和裂隙为主,莺东斜坡带则为复合输导系统,输导体为砂体、不整合和断裂组成;莺东斜坡输导特征分段性明显,从北段、中段到南段输导性能逐渐增强,具有明显差异输导特征。伸展—转换型盆地的这种差异输导特征对天然气运聚成藏及天然气富集具有明显的控制作用,泥—流体底辟树型输导系统决定了中央凹陷带天然气具有环底辟优势聚集分布的特征,复合输导系统影响莺东斜坡带天然气运聚则具有多样性,天然气各段差异聚集特征明显。
The Yinggehai Basin is a typical extensional-transformable basin. Its unique geological conditions determine that natural gas has the characteristics of differential transport. This difference is reflected in the basin scale, zone scale and conductor scale. The central diapir structural zone For the mud-fluid undergone tree-type conductivity system, deep natural gas migrates vertically and diagonally along the diapir faults to the shallow and middle-deep sand bodies at the top of the diapir and its periphery. The main conductor is vertically fractured and fractured. The Yingdong slope is a composite system. The conductor is composed of sand body, unconformity and fracture. The characteristics of the diversion of the Yingdong slope are obvious, The middle to the southern section of the transmission performance gradually increased, with significant differences in the characteristics of the guide. The differential transport characteristics of extensional-transbasic basins have significant control over the migration and accumulation of natural gas and gas enrichment. The mud-fluid diacritical tree-type conduction system determines that the natural gas in the central depression zone has the advantages of episodic diapirism The characteristics of the composite system and the diversion of natural gas in the east of Yingdong slope zone are diverse.