岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 135143.doi: 10.3969/j.issn.1673-8926.2015.05.022
倪新锋1,2,陈永权3,朱永进1,2,杨鹏飞3,熊 冉1,2
Ni Xinfeng1,2, Chen Yongquan3, Zhu Yongjin1,2, Yang Pengfei3, Xiong Ran1
摘要:
由于塔北地区寒武系深层白云岩资料点少,有效恢复岩相古地理成为制约寒武系深层白云岩勘探领域优选的关键地质要素之一。 利用有限的 14 口钻井和 4 个野外露头地质资料点以及地震资料,探讨了塔北地区寒武纪深层白云岩岩相古地理特征,精细刻画了台地类型及台缘特征,并尝试刻画台内沉积分异。塔北地区寒武纪总体发育轮南断控陡坡型台缘和北部沉积缓坡型台缘 2 种类型的台缘,台内滩、膏云坪、膏盐湖及台内洼地等沉积单元分异明显。 台缘特征及台内沉积分异控制了储盖组合的配置,由此得出长期继承性隆起上的寒武系台缘礁滩、礁后滩白云岩与蒸发盐湖相膏盐岩和蒸发潮坪相膏泥质白云岩形成的优质储盖组合为有利的勘探方向。塔北地区寒武系具有 2 个现实的有利勘探区带:轮南陡坡型台缘带和北部缓坡型台缘带,其中,轮南台缘带后侧、泻湖靠海一侧的礁后滩储层上覆致密碳酸盐岩盖层;北部台缘带藻丘及滩体复合型白云岩储层上覆中、下寒武统泥晶白云岩、膏质白云岩及含泥白云岩等致密盖层。北部缓坡型台缘带储盖组合要优于轮南陡坡型台缘带,勘探前景更为乐观。
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