渤海湾盆地济阳坳陷凹隆结构类型及其对沉积的控制作用

发布时间：2018-04-26 16:18

本文选题：断层性质 + 沉积差异性　；参考：《石油实验地质》2017年05期

【摘要】：陡坡带砂砾岩体油藏是断陷盆地油气勘探的主要类型之一。钻井证实,渤海湾盆地济阳坳陷近EW向断层下降盘近源粗碎屑沉积物发育,而N(N)E向断层下降盘近源沉积欠发育或不发育。针对这一特殊地质现象,在凸起区剥蚀量恢复的基础上,探讨了凸起与凹(洼)陷的耦合关系,划分出凸隆凹降型和凹降凸隆型2种关系类型;以现代沉积考察为依据,提出物源区面积、剥蚀厚度以及物源沟谷发育程度等是近源沉积物发育与否的主控因素;研究了EW向断层和N(N)E向断层下降盘的沉积特点,指出在古近纪SN向拉张应力状态下,EW向断层属于同沉积断层,NNE向断层以右旋走滑作用为主,运动学性质和活动时间的不同是沉积差异性的主因。
[Abstract]:Gravel-rock reservoir in steep slope zone is one of the main types of oil and gas exploration in faulted basin. The drilling results show that the coarse clastic sediments near the EW fault descending plate in Jiyang depression, Bohai Bay basin, are developed, while those near the N(N)E fault descending plate are underdeveloped or undeveloped. In view of this special geological phenomenon, on the basis of the recovery of denudation in the uplift region, the coupling relationship between the uplift and the concave (depression) depression is discussed, and two kinds of relation types, the convex and concave descending type and the concave convex uplift type, are divided into two types, which are based on the modern sedimentary investigation. It is suggested that the area of provenance area, denudation thickness and the development degree of provenance gully are the main controlling factors for the development of near-source sediments, and the sedimentary characteristics of EW fault and N(N)E fault descending plate are studied. It is pointed out that the EW fault belongs to the same sedimentary fault and the NNE fault is mainly dextral strike-slip under the condition of the extensional stress in the SN direction of Paleogene. The difference in kinematics and activity time is the main cause of the sedimentary difference.
【作者单位】：中国石化胜利油田分公司油气勘探管理中心;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家重大科技专项(2016ZX05006-003)资助
【分类号】：P618.13

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