地球物理学方法在地层划分对比中的重要作用——以渤东地区T_2统层为例

The Important Role of Geophysical Methods in the Stratigraphic Classification and Correlation——Taking an Example of Confirming the Bottom of Guantao Formation by the Geophysical Mmethods in the East Area of Bohai Sea

地层划分、对比是油气勘探的基础。地层对比有很多方法,常用的方法有岩石地层学、生物地层学和地球物理学。渤东地区由于沉积环境的复杂性,导致利用岩石地层学和生物地层学对馆陶组地层进行划分对比时出现失误,造成了该区南、北T2层不统一。通过利用地震资料从辽东湾地区进行跨区域地层追踪对比,认识到该区馆陶组地层不仅岩性特征不清楚,同样地震反射特征在南、北区也存在差异,从而实现了全区T2层统一,解决了长期困扰、影响油气勘探的问题。

Stratigraphic classification and stratigraphic correlation are the bases of petroleum exploration. Lithostratigraphy, biostratigraphy, geophysics are the common methods of the stratigraphic classification. For the complicated sedimentary environment of the east ar- ea of Bohai Sea, the bottom of Guantao Formation is inconformity in the south part and the north part in the research area on the base of the lithostratigraphy and biostratigraphy data. Rea｜i^ing the lithologic characters of Guantao Formation in the east Bohai Sea are disarray and the seismic reflection characteristics of the south area of the east Bohai Sea are different from the north area of the east Bohai Sea hy comparison the seismic data of Liaodong Bay ascertains the botton of Guantao Formation in the east Bohai Sea, which solves the problem that impeded the petroleum exploration in the east Bohai Sea for a long time.