张家界大坪镇灯影组古油藏特征及天然气勘探意义

发布时间：2018-03-25 00:32

  本文选题：震旦系　切入点：裂缝　出处：《地质学报》2017年08期

【摘要】：野外调查揭示大坪镇灯影组古油藏为裂缝型古油藏,受到滑脱构造控制,裂缝主要分布在灯影组上部;沥青大量充填在裂缝中心,少量沿缝合线分布,或浸染白云岩。通过分析,沥青的δ13 Corg、V/(V+Ni)平均值分别为—33.27‰、0.89,与牛蹄塘组烃源岩非常接近,因此大坪古油藏的油源可能是寒武系牛蹄塘组斜坡相区和盆地相区烃源岩。古油藏裂隙石英脉/方解石脉流体包裹体均一温度和拉曼光谱成分指示了中侏罗世以来古油藏裂缝形成、油气充注、以及因大气水下渗遭受破坏的过程。分析认为大坪古油藏北侧桑植—石门复向斜地区震旦系灯影组埋深近4km,油气保存条件相对较好,且滑脱带上下岩性差异会造成灯影组裂隙发育,对储层有明显的改善作用,具有形成次生气藏的可能性。
[Abstract]:Field investigation revealed that the ancient reservoir of Dengying formation in Daping Zhen is a fractured paleoreservoir, which is controlled by slippage structure and mainly distributes in the upper part of Dengying formation, and a large amount of asphalt is filled in the center of the fracture, and a few is distributed along the suture line. Or leached dolomite. By analysis, the average values of 未 13 Corg V / V / V Ni2 of bitumen are -33.27 鈥，

本文编号：1660770