断裂—岩性体油气藏特征

Features of oil-gas reservoir generated by fault-lithologic body

断裂是形成油气藏的一个主要因素,冲积扇、扇三角洲、生物礁、生物滩等岩性体是油气藏的主要储集体。断裂与岩性体相联合,将形成断裂—岩性体油气藏。以准噶尔盆地为例,断裂和岩性体构成了圈闭要素,形成了准噶尔盆地的主要油气藏类型。断裂作为油气运移通道,参与了岩性体的成藏过程,断裂活动特点决定了准噶尔盆地油气成藏的基本特点。断裂组合样式影响了油气运移、聚集、分布与含油气丰度,断裂活动期次影响了油气运移、聚集的时期与油气成藏模式。准噶尔盆地腹部的车排子—莫索湾古隆起提供了形成地层、断裂—岩性圈闭的条件,其两翼,尤其是东南翼是岩性地层油气藏发育的有利部位。

Fault is a chief factor for affecting oil-gas reservoir formation. The lithologic bodies such as alluvial fan, fan-delta, reef and bio-bank are the main oil-gas reservoir bodies. When the fault is connected with the lithologic body, the fault-lithologic body oil-gas reservoir will be generated. The study on Junggar Basin showed that the fault and lithologic body became the trap elements and resuited in the dominant type of oil-gas pools in Junggar Basin. The fault activities controlled the basic features of pool formation in the basin. The fault combination style moderately influenced the migration, accumulation, distribution and abundance of oil and gas. The faulting phases strongly influenced the oil-gas migration and accumulation period and the style of pool formation. The Chepaizi- Mosuowan paleo-uplift in the interior of the basin provided the elementary environment for the development of the stratigraphic traps and the fault-lithologic traps to a large extent. The two flank slopes of the paleo-uplift are the favorable area for generating the lithologic and stratigraphic oil reservoirs. The southeast flank slope is the best area.