松辽盆地西部斜坡带五颗树地区青三段油气成藏特征
Hydrocarbon accumulation in the third member of the Qingshankou Formation in the Wukeshu region,western Songliao Basin
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摘要: 松辽盆地西部斜坡带五颗树地区青三段以辫状河三角洲前缘沉积为主。砂体主要是水下分流河道和河口坝的细砂岩,分布广、沉积厚,砂地比值高,具有较高的孔隙度和渗透率;研究区油气主要来自于东侧大安-古龙坳陷的青山口组烃源岩,烃源岩以I型干酪根为主;发育于青三段之上的嫩江组暗色泥岩分布广、有机质含量高,为有效的区域性盖层;研究区西北部和东南部各发育一条东南倾向的断层,由于其封堵性差,对油气藏起破坏作用。通过对油气成藏要素的研究发现,该地区青三段具有良好的勘探前景,斜坡背景下低幅度背斜成藏模式是该地区主要的油气成藏模式。Abstract: The braided delta front deposits are accentuated in the third member of the Qingshankou Formation in the Wukeshu region,western Songliao Basin.The subaqueous distributary channel and channel-mouth bar sandstones as the bulk of the sandstones in this region are characterized by wide-spread occurrence,tremendous thickness,higher ratios of total sandstone thickness/stratigraphic thickness,and higher porosity and permeability.The prolific hydrocarbons in the study area are mainly derived from the I-type kerogen-dominated source rocks in the Qingshankou Formation in the Da’an-Gulong depression.The dark mudstones with higher organic matter contents in the Nenjiang Formation overlain upon the third member of the Qingshankou Formation may serve as the valid regional cap rocks.The two major faults in the northwestern and southeastern parts,respectively have a destructive effect on the hydrocarbon accumulation.The results of research in this study show that the third member of the Qingshankou Formation is highly prospective for oil and gas resources.The low-amplitude anticline model is proposed here as a main model for the hydrocarbon accumulation in the slope environment.
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