岩性油气藏 ›› 2015, Vol. 27 ›› Issue (3): 3242.doi: 10.3969/j.issn.1673-8926.2015.03.005
傅 饶1,郑荣才1,常海亮1,祁利祺2,文华国1,李 云1
FU Rao1, ZHENG Rongcai1, CHANG Hailiang1, QI Liqi2, WEN Huaguo1, LI Yun1
摘要:
下二叠统风城组为准噶尔盆地西缘乌尔禾地区重要的原油产层, 储层岩性为云质岩类,具有典型的致密储层性质,为一类成因尚不为人们所熟悉的、但具备巨大油气勘探开发潜力的新型湖相“白烟型”喷流岩。 以岩心观察描述、薄片鉴定、扫描电镜观察、X射线衍射和物性分析资料为基础,以热水沉积学理论为指导,探讨了此类致密油储层的成因特征,提出同期火山喷发-湖底热液喷流-“内、外源”碎屑掺合的混合沉积模式,确定储层发育和分布受 4 种因素控制:①半深湖—深湖环境为湖底喷流岩致密油储层的发育奠定了物质基础;②构造破裂和溶蚀是改善储层物性和在致密油储层中形成“甜点”的主要作用方式; ③区域构造格局和断裂构造的继承性活动,控制了喷流岩致密油储层的区域分布,提供了同期火山喷发、热液喷流、成岩期流体溶蚀改造及油气运移成藏的通道;④半深湖—深湖相“白烟型”喷流岩聚集区中具备多期次构造破裂和热液溶蚀作用的叠合部位,是有利的致密油储层“甜点”分布位置,也是致密油藏的预测目标。
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