非成熟与成熟盆地中三级和四级地层层序的识别──以格陵兰中东部和路易斯安那海上为例

Identification of third and fourth order stratigraphic cycles in unexplored and mature basins: Central-East Greenland and the Louisiana offshore

Resource Finders, Inc.230 FZ Goss Road,Picawnc, MS 39466－9707 USA

Resource Finders, Inc.230 FZ Goss Road, Picawnc, MS 39466－9707 USA

油气勘探通常使用地层学来确定地质年代和预测沉积环境及岩性。现已发表的全球地层表包括从一级到四级的沉积旋回划分, 各自的周期分别为一亿年、一千万年、一百万年、十万年／一万年。根据海平面位置升降的确定, 地震地层学可以用来划分局部地层层序, 当它与全球地层表对比时, 得到绝对年代。本文对格陵兰中东部盆地和路易斯安那盆地中的沉积划分出了三级和四级地层层序, 并根据区域地质和相应的全球地层表得到岩性模型, 制作倾向方向的合成地震剖面, 用来帮助解释。在本项地震解释中, 我们识别和描述了每个反射波, 并将其归结为全球或局部的沉积过程的结果, 指出了每个反射的成因机制。

Hydrocarbon exploration routinely utilizcs stratigraphy for dating and predicting the depositional environments and lithology. Published global stratigraphy contains a hierarchy of sedimentation cycles, from first through fourth order, of 100000000, 10000000, 1000000,100000/10000 year periodicitics, respectively. Seismic stratigraphy may be used to develop a local sequence stratigraphy based principally on the determination of sealevcl position/ oscillations,which when compared to a global stratigraphy provides absolute dates.Third and fourth order stratigraphic cycles were identified in basins in Central- East Greenland and the Louisiana offthore. Synthetic dip seismic sections, derived from lithologic models, and based on regional geology and appropriate global stratigraphy, were used to support the interpretation.In this seismic interpretation, we identified and described each reflection and defined its origin as the result of eithcr global or local processes. An originating mechanism was assigned to cach reflection.