吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (3): 639-650.doi: 10.13278/j.cnki.jjuese.201603102
王建君1, 李浩武1, 胡湘瑜1, 王青1, 汪斌2, 杨仓3
Wang Jianjun1, Li Haowu1, Hu Xiangyu1, Wang Qing1, Wang Bin2, Yang Cang3
摘要:
基于对Ucayali盆地油气成藏要素的系统解剖,预测盆地内除已发现的逆冲背斜/断背斜外,还可能发育伸展断块、潜山、生物礁、地层尖灭、河道砂及逆冲断层下盘构造等多种圈闭类型,自西向东前展式推覆的逆冲背斜/断背斜为最主要的圈闭类型。前陆运动前盆地构造圈闭发育程度低,现今原油聚集多属前陆运动后二次调整成藏,淡水侵入使浅部油藏普遍遭受轻度降解。由于Shira隆起的分隔作用,西部次盆现今生成的烃类很难运移至东部圈闭中。而东部次盆烃源岩埋深小,Ene组展布面积有限,Ambo群趋于生气,在生油窗内生成的液态烃类相对有限,加之圈闭不断生长,圈闭充满度较低。同时,活动性断层对烃类侧向运移不利,其东侧的背斜圈闭往往无法得到有效充注,形成大规模原油聚集的潜力较小。南部和西部次盆成藏条件配置好,逆冲褶皱发育,圈闭可得到烃类持续充注,主要以天然气为主;南部次盆逆冲断层下盘构造圈闭为重要潜在勘探目标;Ene次盆勘探程度低,烃源岩品质好,仍有发现大型构造圈闭的潜力。
中图分类号:
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