珠江口盆地珠二坳陷文昌组构造差异性与动力学成因机制

发布时间：2018-01-05 11:02

  本文关键词：珠江口盆地珠二坳陷文昌组构造差异性与动力学成因机制　出处：《地学前缘》2017年06期 　论文类型：期刊论文

  更多相关文章： 珠江口盆地 珠二坳陷 构造差异 动力学

【摘要】：通过统计珠二坳陷主要基底断层的要素特征,并计算典型断层的活动速率,系统地研究了文昌组沉积期研究区构造差异性,探讨了差异构造的动力学成因机制。结果表明阳江—一统暗沙东断裂带控制研究区西部开平—顺德凹陷和东部白云凹陷的构造差异性,主要表现在前新生代构造环境、新生代基底断裂走向、文昌组断层活动性和凹陷结构等方面。开平凹陷北侧和白云凹陷南侧控凹边界断层在新生代早期可能属于同一条初始断裂带。研究区东西部前新生代不同的岩石圈结构导致了文昌组构造动力学成因机制迥异:西部开平—顺德凹陷中生代处于火山弧区,较厚的上部地壳高度脆性破裂同时被大量沉积物充填,形成北断南超型窄半地堑结构;东部白云凹陷中生代位于弧前区,地壳韧性变形较强,文昌组沉积物源相对不足,形成南断北超型宽半地堑结构。云开低凸起作为构造调节带,对其两侧的差异性构造变形具有调节作用。
[Abstract]:Through the statistical features of two beads depression mainly basement faults, and calculate the typical fault activity rate, systematic study of the Wenchang formation of tectonic difference, discusses the dynamic mechanism between structures. The results show that the Yangjiang East yitongansha fault zone control research area of Western Kaiping - Shunde depression tectonic depression and the eastern clouds, mainly in the tectonic environment of the Cenozoic, to the Cenozoic basement fault, Wenchang fault depression group activity and structure. Kaiping sag north and south of the Baiyun Sag depression controlled boundary faults in the early Cenozoic may belong to the same initial fault zone. The lithosphere structure study area east before the new generation of different leads to different tectonic dynamic mechanism: Wenchang group in Western Kaiping - Shunde depression in Mesozoic volcano arc area, thick high degree of brittle upper crust At the same time of rupture by a large number of sediment filling, the formation of the North South fault type super narrow half graben structure; the eastern Baiyun sag is located in the area before the Mesozoic arc crust, ductile deformation is strong, the relative lack of sediment sources in Wenchang group, the formation of super wide north South fault type half graben structure. As the Yunkai low uplift tectonic transfer zones, structural differences on the on both sides of the deformation has a regulatory role.

【作者单位】： 中海油研究总院;
【基金】：“十三五”国家科技重大专项“南海深水区油气资源潜力与大中型油气田勘探方向”(2016ZX05026-007)
【分类号】：P618.13
【正文快照】： 珠江口盆地是南海北部陆缘新生代被动裂谷盆地之一,北部陆架浅水区珠一坳陷和珠三坳陷的油气勘探程度较高,钻井已证实始新统文昌组中深湖相和渐新统恩平组煤系为主力烃源岩[1]。预测南部陆坡深水区珠二坳陷发育三套烃源岩,其中,钻井已证实恩平组海陆过渡相煤系和珠海组海相泥，

本文编号：1382821