东营凹陷郑南地区沙四上亚段坡折带对层序、沉积与油气成藏控制

来源期刊:中南大学学报(自然科学版)2013年第8期

论文作者:宋广增 王华 甘华军 徐蒙 刘睿 王跃刚 孙鸣 任金锋

文章页码:3415 - 3425

关键词:郑南地区;坡折带;微地貌;可容纳空间;油气成藏模式

Key words:Zhennan area; slope-break; microtopography; accomdation space; pooling model

摘    要:通过分析断层活动性与恢复古地貌,识别出郑南地区沙四上亚段发育典型性与特征性的三级坡折带。Ⅰ级坡折带与Ⅱ级坡折带均为断裂坡折,Ⅲ级坡折带为逆牵引作用形成的挠曲坡折。建立郑南地区三级坡折带对层序发育样式的控制模式,分析出其对沉积体系的发育位置、沉积体的储集物性、纵向沉积相分异、沉积体系展布方向与展布规模等具有控制性。Ⅰ级坡折带上发育沟梁相间分布的特征性微地貌,沟部控制物源输入,梁部形成鼻状构造,对沉积与成藏具有一定意义。由油源条件、储集条件、运移条件、盖层条件、圈闭条件出发,具体分析了坡折带可以控制形成油气富集带,并识别出郑南地区4种油气成藏模式:背斜成藏模式、断层封闭遮挡成藏模式、岩性圈闭成藏模式与砂体上倾尖灭成藏模式。综合分析郑南地区沙四上亚段坡折带对层序、沉积与油气成藏控制,丰富了坡折带理论,并对东营凹陷郑南地区油气藏的勘探具有指导意义。

Abstract: Through analyzing the fault activity and recovering palaeogeomorphology in Zhennan area, Dongying sag, the classical and characteristical multistage slope-break zones are recognized in the Upper Es4. The Ⅰ-stage and the Ⅱ- stage slope-break zones both are fault slope-break, the Ⅲ-stage is flexure slope-break. The control model of the slope-break on sequence pattern was founded, its control on the development location of depositional system, the reservoir physical property, vertical phase segregation and the direction and scale of depositional system distribution were analysed.Ⅰ-stage slope-break zone developed the characteristical microtopo-graphy, where the channel and the beam distributed alternatively, which was significant for sedimentation and hydrocarbon accumulation. From the point of oil sources, reservoir nature, migration, capping formation and trap, the conclusion that the slope-break could control the formation of hydrocarbon abundance zone was reached, and pooling model could be summarized as four patterns of forming reservoir such as acticline, fault-sealing barrier, lithologic trap and sand undip and nip. Analysing the slope-break and its control on the sequence, sedimentation and hydrocarbon accumulation of the Upper Es4 in Zhennan area has enriched the theory of slope-break zone and could guide the oil exploration activity.

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