This paper takes the South Yellow Sea as an example to show a new method for comprehensive geological-geophysical research such as residual basin and tectonolayering using airborne gravity and magnetic data in China. ...This paper takes the South Yellow Sea as an example to show a new method for comprehensive geological-geophysical research such as residual basin and tectonolayering using airborne gravity and magnetic data in China. Based on airborne gravity and magnetic data, by measuring and analyzing stratigraphic density and susceptibility, the depths to the pre-Sinian magnetic basement top, the pre-Jurassic top and the Cenozoic bottom, are obtained by forward and inverse methods constrained by seismic and drilling data; and furthermore, the residual thicknesses of the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic are calculated. Based on airborne gravity and magnetic anomalies, the faults in the pre-Sinian magnetic basement, the Jurassic-Cretaceous and the Cenozoic are respectively interpreted by the qualitative and quantitative methods. On the basis of the above study, and combining regional important tectonic events, four tectonolayers are divided in the vertical succession in South Yellow Sea, namely the pre-Sinian magnetic basement, the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic. The result shows that there are thick Cenozoic and Jurassic-Cretaceous strata and thin residual Sinian-Triassic strata in the Suzhong-Huangnan depression area, but there are thin or only sporadic Mesozoic-Cenozoic terrestrial strata and thick Sinian-Triassic marine strata reserved in Subei-Huangzhong uplift area and Sunan-Wunansha uplift area. The four tectonolayers are very different in structures as well as distributions in plane.展开更多
In this study,we discuss the methods and results for the tectonolayer of a hydrocarbon basin using airborne gravity and magnetic data in the Qijia-Gulong area of the Songliao Basin.Using the latest airborne gravity an...In this study,we discuss the methods and results for the tectonolayer of a hydrocarbon basin using airborne gravity and magnetic data in the Qijia-Gulong area of the Songliao Basin.Using the latest airborne gravity and magnetic data combined with seismic and drilling data,we determined the density and magnetic measurement data of strata(rocks)in the study area.Next,density and structural stratifications were conducted.The structural sections of the strata-structure-magmatic rocks in the shallow,middle,and deep strata of the basin were determined,and a three-dimensional framework with multiple levels of the basin was constructed.Combining qualitative analysis and quantitative calculation,we explained the depths of the bottom of the Cenozoic layer,the bottom of the Upper Cretaceous layer,the bottom of the Mesozoic layer,and the top of the magnetic basement.We also determined the thicknesses of the Cenozoic layer,the Upper Cretaceous layer,the Upper Jurassic-Lower Cretaceous layer,and the Upper Paleozoic layer.These provide important achievements for the new petroliferous strata survey of regional Upper Paleozoic and Upper Jurassic-Lower Cretaceous strata.At the same time,it provides a new exploration method for studying are as with magmatic rocks and unclear deep seismic reflections.The results show that the new Upper Paleozoic strata(with a thickness of 0-9200 m)are mainly distributed in the central and eastern regions but absent in the western region.This yields significant differences in different regions of the study area.The thickness and depth of the Upper Jurassic-lower Cretaceous layer were different between the eastern and western regions;thicker and deeper in the middle eastern region but thinner and shallower in the western region.展开更多
基金the National Important Special Project of Science and Technology of China(Grant No.GZH200200301 and No.GZH200900502)
文摘This paper takes the South Yellow Sea as an example to show a new method for comprehensive geological-geophysical research such as residual basin and tectonolayering using airborne gravity and magnetic data in China. Based on airborne gravity and magnetic data, by measuring and analyzing stratigraphic density and susceptibility, the depths to the pre-Sinian magnetic basement top, the pre-Jurassic top and the Cenozoic bottom, are obtained by forward and inverse methods constrained by seismic and drilling data; and furthermore, the residual thicknesses of the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic are calculated. Based on airborne gravity and magnetic anomalies, the faults in the pre-Sinian magnetic basement, the Jurassic-Cretaceous and the Cenozoic are respectively interpreted by the qualitative and quantitative methods. On the basis of the above study, and combining regional important tectonic events, four tectonolayers are divided in the vertical succession in South Yellow Sea, namely the pre-Sinian magnetic basement, the Sinian-Triassic, the Jurassic-Cretaceous and the Cenozoic. The result shows that there are thick Cenozoic and Jurassic-Cretaceous strata and thin residual Sinian-Triassic strata in the Suzhong-Huangnan depression area, but there are thin or only sporadic Mesozoic-Cenozoic terrestrial strata and thick Sinian-Triassic marine strata reserved in Subei-Huangzhong uplift area and Sunan-Wunansha uplift area. The four tectonolayers are very different in structures as well as distributions in plane.
基金funded by National Key Research and Development Program of China(no.2023YFB3907703)Project of Aviation Gravity and Magnetism Comprehensive Investigation in Xinjiang Awulale IronResource Base(no.DD20240205003).
文摘In this study,we discuss the methods and results for the tectonolayer of a hydrocarbon basin using airborne gravity and magnetic data in the Qijia-Gulong area of the Songliao Basin.Using the latest airborne gravity and magnetic data combined with seismic and drilling data,we determined the density and magnetic measurement data of strata(rocks)in the study area.Next,density and structural stratifications were conducted.The structural sections of the strata-structure-magmatic rocks in the shallow,middle,and deep strata of the basin were determined,and a three-dimensional framework with multiple levels of the basin was constructed.Combining qualitative analysis and quantitative calculation,we explained the depths of the bottom of the Cenozoic layer,the bottom of the Upper Cretaceous layer,the bottom of the Mesozoic layer,and the top of the magnetic basement.We also determined the thicknesses of the Cenozoic layer,the Upper Cretaceous layer,the Upper Jurassic-Lower Cretaceous layer,and the Upper Paleozoic layer.These provide important achievements for the new petroliferous strata survey of regional Upper Paleozoic and Upper Jurassic-Lower Cretaceous strata.At the same time,it provides a new exploration method for studying are as with magmatic rocks and unclear deep seismic reflections.The results show that the new Upper Paleozoic strata(with a thickness of 0-9200 m)are mainly distributed in the central and eastern regions but absent in the western region.This yields significant differences in different regions of the study area.The thickness and depth of the Upper Jurassic-lower Cretaceous layer were different between the eastern and western regions;thicker and deeper in the middle eastern region but thinner and shallower in the western region.
