利用PARKER变密度多层界面快速反演技术反演渤海地区密度界面  

Inversion of density interface with PARKER variable technology in Bohai region by gravity data

作　　者：韩波[1,2] 张菲菲[1,2] 田振兴[1,2] Han Bo;Zhang Feifei;Tian Zhenxing(Qingdao Institute of Marine Geology, Qingdao 266071;Key Laboratory of Marine Oil and Gas and Geological Environment, Ministry of Land and Resources, Qingdao 266071)

机构地区：[1]青岛海洋地质研究所,青岛266071 [2]国土资源部海洋油气与地质环境重点实验室,青岛266071

出　　处：《高技术通讯》2020年第6期637-643,共7页Chinese High Technology Letters

基　　金：国家自然科学基金青年项目(41206050);973计划(2013CB429701);国土资源大调查(1212010511302)资助项目。

摘　　要：利用重力资料反演地下密度界面对于了解地壳深部结构、区域地质及资源矿产勘探等都是非常重要的。本文基于渤海地区的重力资料,利用PARKER变密度多层界面快速反演技术,反演了渤海地区密度界面。共反演了4个密度界面,由浅到深分别为第四系+新近系和古近系之间的界面,中生界与古近系之间的界面,奥陶系与上覆地层之间的界面,第4个密度界面是莫霍面,是区域性重力异常产生的原因。密度界面反演结果和地震解释的界面吻合较好,有部分地区有差异,并不是所有凹陷地区的莫霍面也是凹陷形态,凸起地区的莫霍面也是凸起形态。这是由于盆地边界的断裂控制作用引起密度变化不均匀,从而间接证明莫霍面起伏和地质运动、构造活动等和密度界面变化有紧密关系,密度界面反演工作为地质构造研究提供了基础数据。Inversion of underground density interface using gravity data is very important for understanding deep crustal structure,regional structure and metal mineral exploration.The density interfaces of Bohai Sea are inverted by PARKER variable density multilayer interface fast inversion technology with the gravity data of Bohai Sea.There are 4 density calculated interfaces.The first interface is the interface between Quaternary+Neogene and Paleogene,the second interface is the interface between the Mesozoic and Paleogene,the third density interface is the interface between the Ordovician and the overlying strata,and the fourth density interface is Moho,which is the reason for the regional gravity anomalies.The inversion result of density interface basically coincides with the interface of seismic interpretation,and there are differences in some areas.Not all the Moho surfaces in the depression area are also the depression shape,and the Moho surfaces in the uplift area are also the bulge shape,which is caused by the fracture control of the basin boundary and the uneven density change,thus indirectly proving that the Moho surface undulation,geological movement,structural activity,etc.The density interface is closely related to the change of density interface.The inversion of density interface provides data basis for the study of geological structure.

关 键 词：渤海 重力异常 密度界面 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]