基于GOCAD软件的渤中凹陷428构造带三维地质建模

3D geological modeling of the 428 Tectonic Zone in Bozhong Depression using GOCAD software

428潜山构造带位于渤中凹陷中部,是中生代多期次的褶皱叠加和中新生代伸展裂解作用的结果,如何认识该潜山三维几何学特征,对于揭示不同构造期次的叠加-改造过程以及深层油气藏的勘探开发具有十分重要的作用。根据三维地震数据、钻井资料,并结合三维地质建模软件GOCAD,构建了428构造带的三维地质模型。通过对模型中地层和断层展布的几何学特征的详细分析,识别出428构造带及其周缘地区褶皱变形样式,以及潜山内幕断层的交切关系。其中,428东构造区为一元结构,太古宇上覆古生界,褶皱变形在空间上表现为短轴褶皱,其可能为印支和燕山2期褶皱叠加作用的结果;428西构造区以二元结构为主,太古宇上分布古生界和中生界,褶皱变形在空间上表现为背斜和向斜的特征,可能为燕山期褶皱作用的结果。

The 428 tectonic zone is a buried hill,located in the central part of Bozhong Depression in Bohai Bay basin,and is the result of multi-stage fold superposition and extensional fracture.How to understand the three-di-mensional geometric features of the buried hill is very important to reveal the superposition-remodeling process in different tectonic stages and the development of deep oil and gas reservoirs.In this paper,a 3D geological model of the 428 tectonic zone was constructed based on 3D seismic and drilling data using 3D geological modeling soft-ware GOCAD.By comparing and analyzing the stratigraphic distribution and fault development in the model,we identified the fold deformation pattern of the 428 tectonic zone and its peripheral area,as well as the intersection of inner faults in the 428 tectonic zone.The eastern 428 tectonic zone is a uni-structural belt where the Paleozoic strata overlay the Archean basement,while the western 428 tectonic zone is a dual-structural belt where the Pa-leozoic and Mesozoic strata sit on the Archean basement.The fold deformation patterns of the two belts reflect the superposition of Indosinian and Yanshanian folding processes.