岩性油气藏 ›› 2018, Vol. 30 ›› Issue (4): 1425.doi: 10.12108/yxyqc.20180402
冯有良, 胡素云, 李建忠, 曹正林, 吴卫安, 赵长义, 崔化娟, 袁苗
FENG Youliang, HU Suyun, LI Jianzhong, CAO Zhenglin, WU Weian, ZHAO Changyi, CUI Huajuan, YUAN Miao
摘要: 准噶尔盆地西北缘是该盆地油气最富集的区带,岩性地层油气藏是其主要的勘探领域,同沉积构造坡折对层序建造和岩性油气藏富集带具有控制作用。应用地震、钻井和测井资料,按照构造层序分析的方法,对该区同沉积构造坡折特征及其控制的层序建造进行了系统研究。结果表明:该区发育的同沉积构造坡折按成因可划分为同沉积逆断裂坡折和隐伏断裂挠曲坡折。前者是同期发育的逆断层活动造成的湖底坡度梯度变化带,后者是深部隐伏断裂活动造成的湖底坡度梯度变化带。中—晚二叠世,该区属于断坳转换幕,发育同沉积逆断层坡折及其控制的层序建造。三叠纪以后盆地处于挤压坳陷阶段,发育同沉积逆断裂坡折和隐伏断裂挠曲坡折及其控制的层序建造。同沉积逆断裂坡折控制的层序建造向岸一侧低位域发育冲积扇到辫状河道砾岩,向湖一侧发育辫状河三角洲沉积;湖扩展体系域坡折向岸一侧发育薄层泛滥平原、浅湖及退积型三角洲沉积,向湖一侧发育泛滥平原或半深湖沉积;高位域发育河流、三角洲前缘,其可越过坡折向湖进积。挠曲坡折控制的层序建造低位域坡折向岸一侧发育辫状下切水道充填,向湖一侧发育由滨浅湖滩坝砂体或低位辫状三角洲砂体构成的低位楔;湖扩展体系域坡折向岸一侧发育滨浅湖,向湖一侧发育半深湖沉积;高位域发育河流三角洲及滨浅湖沉积。同沉积构造坡折控制的层序低位域砂砾岩体储层,如冲积扇、辫状河道、低位三角洲及滨浅湖砂体、湖底扇砂体,若有断裂和不整合面与风城组油源沟通,能形成良好成藏条件,有利于岩性油气藏发育。
中图分类号:
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