本文選題：震旦系　切入點：裂縫　出處：《地質(zhì)學(xué)報》2017年08期

【摘要】：野外調(diào)查揭示大坪鎮(zhèn)燈影組古油藏為裂縫型古油藏,受到滑脫構(gòu)造控制,裂縫主要分布在燈影組上部;瀝青大量充填在裂縫中心,少量沿縫合線分布,或浸染白云巖。通過分析,瀝青的δ13 Corg、V/(V+Ni)平均值分別為—33.27‰、0.89,與牛蹄塘組烴源巖非常接近,因此大坪古油藏的油源可能是寒武系牛蹄塘組斜坡相區(qū)和盆地相區(qū)烴源巖。古油藏裂隙石英脈/方解石脈流體包裹體均一溫度和拉曼光譜成分指示了中侏羅世以來古油藏裂縫形成、油氣充注、以及因大氣水下滲遭受破壞的過程。分析認(rèn)為大坪古油藏北側(cè)桑植—石門復(fù)向斜地區(qū)震旦系燈影組埋深近4km,油氣保存條件相對較好,且滑脫帶上下巖性差異會造成燈影組裂隙發(fā)育,對儲層有明顯的改善作用,具有形成次生氣藏的可能性。
[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，

本文編號：1660770