吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (6): 1636-1653.doi: 10.13278/j.cnki.jjuese.20200219
韩国猛1, 陈冬霞2, 马建英1, 王梓颐2, 董晓伟1, 高思航2, 邹磊落1, 王娜1
Han Guomeng1, Chen Dongxia2, Ma Jianying1, Wang Ziyi2, Dong Xiaowei1, Gao Sihang2, Zou Leiluo1, Wang Na1
摘要: 挠曲坡折带油气资源前景广阔,已成为陆相湖盆中的勘探开发与研究热点。由于古地貌或古构造的差异造成多阶挠曲型斜坡地层发生多个折曲变形,同时,由于斜坡结构及构造特征、沉积特征和烃源岩特征等均存在较大的差异,导致复杂的油气分布和油气成藏过程。以多阶挠曲型斜坡——黄骅坳陷歧北斜坡为例,通过研究斜坡形成和演化过程中古地貌和断层耦合下的斜坡结构和构造特征、输导体系、油气运移路径和运移动力等特征,揭示了多阶挠曲斜坡的油气成藏机制。结果表明,歧北斜坡长轴和短轴方向上的古地形、断层及组合样式、砂体成因类型与延伸范围、与烃源岩接触关系、油气运移动力与路径等方面均存在较大差异。长轴方向具有以下特点:以挠曲坡折构造为界,高、中、低斜坡分异;大型断层不发育且三角洲砂体范围局限,中、低斜坡以近源砂体输导为主,砂体连通性好;形成了坡折背景的"缓坡-双边断脊优势-源控型"成藏模式。短轴方向特点为:以滨海断层、港东断层、南大港断层为边界,发育近东西走向的断层坡折构造,次级断层发育,剖面和平面上呈多种组合方式;水下扇砂体连通性好,与一系列断层形成阶梯状输导路径;形成了"近源-阶梯状输导-断控型"成藏模式。
中图分类号:
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