IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20082

Xie Jian-bo

引用次数: 0

A multidiscipline method of geological survey,seismic profile and gravity measurement applied to fold-and-thrust belt:a case study along the Hutubi River in the northern piedmont of Tianshan 多学科地质调查、地震剖面和重力测量方法在褶皱冲断带研究中的应用——以天山北麓呼图壁河为例

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.6038/CJG20140108

Ke-Shi Chen, C. Gumiaux, R. Augier, Yan Chen, Yan-Hui Mei, Wei Lin, Qingchen Wang

{"title":"A multidiscipline method of geological survey,seismic profile and gravity measurement applied to fold-and-thrust belt:a case study along the Hutubi River in the northern piedmont of Tianshan","authors":"Ke-Shi Chen, C. Gumiaux, R. Augier, Yan Chen, Yan-Hui Mei, Wei Lin, Qingchen Wang","doi":"10.6038/CJG20140108","DOIUrl":"https://doi.org/10.6038/CJG20140108","url":null,"abstract":"Fold-and-thrust belts are hot topics in the research of orogens. However, the single geological or geophysical discipline often provides multisolutions on the geometry of a fold-and-thrust belt. We introduce here a multidisciplinary method combining geological and geophysical methods, take the Hutubi River section as a case to study the geometry of the fold-and-thrust belt in the northern piedmont of Tianshan. Firstly, we have carefully taken geological survey and got structural data on the surface. Secondly, petroleum seismic profile was re-interpreted based on the surface data and drilled wells. However, the seismic profile is absent in the contact zone between the mountain and the Junggar basin. We therefore carried out gravity measurements and forward modeling along this profile with the densities of the basement and sediments. The result shows that the northern flank fault of Tianshan doesn't exist along the Hutubi River profile, and the basin sediments could be continually followed from the basin to the mountain interior. This indicates that the tectonic structures in the contact zones between the mountain and the basin are variable, as the western section in the Jingou River section shows that the Tianshan basement thrusts northward on the basin sediments. Based on the balance-section technology, the restored section shows 4. 8 km of shortening. Comparing with previous results, this indicates the heterogeneous deformation along the northern piedmont of Tianshan. It also implies that this multidisciplinary method could be widely used in the fold-and-thrust belt.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71078153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Tectonostratigraphic structure and crustal extension of the Qiongdongnan basin,northern South China Sea 南海北部琼东南盆地构造地层结构与地壳伸展

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.6038/CJG20141008

Z. Di, Qiu Ning, Wang Zhangwen, Wang Zhenfeng, Sun Zhen

{"title":"Tectonostratigraphic structure and crustal extension of the Qiongdongnan basin,northern South China Sea","authors":"Z. Di, Qiu Ning, Wang Zhangwen, Wang Zhenfeng, Sun Zhen","doi":"10.6038/CJG20141008","DOIUrl":"https://doi.org/10.6038/CJG20141008","url":null,"abstract":"Rifting of the Qiongdongnan basin initiated in the Cenozoic above the Pre-Cenozoic basement which was overprinted by rifting basin tectonics soon after becoming part of a rifted passive continental margin of the South China Sea. Using integrated data of sedimentary horizons,wells,seismic reflection,and the observed gravity field,we constructed a crust-scale structural model of the Qiongdongnan basin.Many characteristics of this model reflect the tectonostratigraphic history of the basin.The structural and isopach maps of the basin allow us to retrace the well-established history of the basin comprising a dominant structural trend ofgradually shifting depocentre from the Paleogene sequence(45Ma~23.3Ma)to the Neogene to Quaternary sequence(23.3 Ma~present)towards the west or southwest.The present-day configuration of the basin implies that the basin fill of Cenozoic sediments becomes thinner towards the east.By integrating several reflection seismic profiles,interval velocity and performing gravity modeling, we have modeled the sub-sedimentary basement of the Qiongdongnan basin.The results show some high-velocity bodies in the lower part of crust(vP7.0 km ·s-1),and most probably is igneous magma underplated to the lower stretched continental crust during the final rifting and early spreading phase.The crystalline continental crust spans from the weakly stretched domains(as thick as about 25km)near the continental shelf to the extremely thinned domains(of less than 2.8km thickness)in the central depression,representing the continental margin rifting process in the Qiongdongnan basin.The estimated distribution of the crustal extension factor(β)of the basin shows that the factor in central depression is maximum value(6.0),while that in northern and southern side wings is minimum value(2.0).This model can shed light on future numerical simulation researches,including the reconstruction of the evolutionary processes from the rifted basin to the passive margin one and the evolution of the thermal field of the basin.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71078818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Stratosphere‐Troposphere Exchange Corresponding to a Deep Convection in the Warm Sector and Abnormal Subtropical Front Induced by a Cutoff Low over East Asia 东亚上空一个切断低压诱发的暖区深层对流和副热带锋异常的平流层-对流层交换

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20079

Shi Chun-hua, Guo Dong, L. Hui, Zheng Bin, Liu Renqiang

{"title":"Stratosphere‐Troposphere Exchange Corresponding to a Deep Convection in the Warm Sector and Abnormal Subtropical Front Induced by a Cutoff Low over East Asia","authors":"Shi Chun-hua, Guo Dong, L. Hui, Zheng Bin, Liu Renqiang","doi":"10.1002/CJG2.20079","DOIUrl":"https://doi.org/10.1002/CJG2.20079","url":null,"abstract":"We studied a deep convection in the warm sector and abnormal subtropical front caused by a cutoff low over East Asia in June 2009 by using cloud profile radar data from Cloudsat, temperature of black body from FY2C, atmospheric compositions from Aura/MLS, meteorological data from the ECMWF and HYSPLIT4 trajectory model. The analysis shows that for the sake of the background of southern trough, there is a weaker rainfall from the inner fronts, while nearly 1000km-scale deep convection occurs in the warm sector. At the nearly mature stage of the low, the subtropical front induced by the cutoff low is abnormally developing throughout the whole troposphere, which is due to the warm and humid air from southwest gathering along the subtropical front. After rapid eastward movement of the front into the rain belt of the warm sector, the strong ascending branch of thermal indirect secondary circulation across the frontal zone enhances deep convection at the colder part below the front. But it is difficult to sustain because the supplement of water vapor is blocked by the abnormal front. Furthermore, intense stratosphere-troposphere exchange occurs in the abnormal subtropical front zone due to the convective injection into stratospheric intrusions. On the scatter plot of ozone and water vapor these are two special gathering areas with both high (low) concentrations of the two species.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CJG2.20079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51212173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Least‐Squares Reverse Time Migration in Visco‐Acoustic Media 粘声介质的最小二乘逆时偏移

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20085

L. Zhenchun, Guo Zhen-bo, Tian Kun

{"title":"Least‐Squares Reverse Time Migration in Visco‐Acoustic Media","authors":"L. Zhenchun, Guo Zhen-bo, Tian Kun","doi":"10.1002/CJG2.20085","DOIUrl":"https://doi.org/10.1002/CJG2.20085","url":null,"abstract":"As the subsurface medium is widely viscous, it is necessary to compensate absorption and to correct dispersion of seismic waves in true-amplitude pre-stack imaging. The instability problem encountered in conventional inverse-Q migration hinders the application of the method. In this work, imaging was treated as a linear inverse problem named least-squares reverse time migration (LSRTM). Firstly, we linearized the wave equation and defined the cost function. Then based on the derived equations of the adjoint wave propagation operator, iterative solution was derived using the adjoint-state method. At last dynamical phase encoding technology was used to reduce computation cost. This method breaks a new way for imaging in visco-acoustic media while avoiding the instability problem. The true-amplitude imaging results can be obtained while compensating absorption and correcting dispersion automatically. It is also a good way to suppress the imaging noise and correct amplitude unbalance caused by geometrical spreading or weak illumination. Compared with conventional reverse time migration (RTM), this method can yield results with higher resolution and lower imaging noise. The validity of the method was demonstrated by the numerical test on synthetic seismic data.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CJG2.20085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51212592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Research and Application of Three‐Dimensional Density Interface Inversion 三维密度界面反演的研究与应用

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20086

F. Juan, Meng Xiaohong, Chen Zhaoxi, Shi Lei, Wu Yue, Fan Zhen-jun

引用次数: 1

Estimating Penetration Depth of the CHTEM‐I System by the Diffusive Electric Field Method 用扩散电场法估计CHTEM - I体系的穿透深度

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20088

Chen Bin, Mao Li-feng, Liu Guang-ding

{"title":"Estimating Penetration Depth of the CHTEM‐I System by the Diffusive Electric Field Method","authors":"Chen Bin, Mao Li-feng, Liu Guang-ding","doi":"10.1002/CJG2.20088","DOIUrl":"https://doi.org/10.1002/CJG2.20088","url":null,"abstract":"Penetration depth is one of key technical parameters in the airborne time-domain electromagnetic system (ATEM), which plays an important role in system design as well as data interpretation. When the difference of conductivity between the target layer and host rock is small or the anomaly response of the target layer is not obvious, the conventional method for estimating penetration depth is no longer applicable. To overcome this drawback, this study suggests a new approach. It simulates the diffusion processes of the induced electric field in a uniform half-space model or a layering model and determines the transient position of the field with the largest amplitude in the subsurface. Then it defines that the depth of this position is the penetration depth of the system, where the measured response value is equal to the given noise level. Taking the China helicopter time-domain electromagnetic system I (CHTEM-I), developed independently by our own forces, as the example, this work presents the application of this new method. It compares calculation results under various conditions, produces relation curves of penetration depth, flight height and noise level, and explores how to enhance the penetration depth of the system. The results show that the system can probe down depth 300 m in the case that noise level is proportional to t−05 when the half-space model has conductivity in 0.000295∼0.0422 S/m. This depth estimation method is not affected by factors such as layer thickness and magnitude of conductivity difference between the target layer and host rock, and thus very applicable. It is of significance to design including estimation of penetration depth for various time-domain airborne electromagnetic systems.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CJG2.20088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51212752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Quality Factor Characteristics of Six Metamorphic Kinds of Coal in China 中国六种变质煤的品质因子特征

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20089

Xu Xiao-kai, Wang Yun, Meng Zhao-ping

引用次数: 1

Comparison between ionospheric character parameters retrieved from FORMOSAT3 measurement and ionosonde observation over China FORMOSAT3卫星与中国电离层特征参数的比较

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.6038/CJG20141116

Lingfeng Sun, B. Zhao, X. Yue, T. Mao

引用次数: 10

Geothermal Characteristics and Hydrocarbon Accumulation of the Northern Marginal Basins, South China Sea 南海北部边缘盆地地热特征与油气成藏

IF 1.4 4区地球科学

地球物理学报 Pub Date : 2014-01-01 DOI: 10.1002/CJG2.20084

Tang Xiao-yin, Hu Sheng-biao, Zhang Gong-cheng, Liang Jian-She, Y. Shu-chun, Rao Song, L. Weiwei

{"title":"Geothermal Characteristics and Hydrocarbon Accumulation of the Northern Marginal Basins, South China Sea","authors":"Tang Xiao-yin, Hu Sheng-biao, Zhang Gong-cheng, Liang Jian-She, Y. Shu-chun, Rao Song, L. Weiwei","doi":"10.1002/CJG2.20084","DOIUrl":"https://doi.org/10.1002/CJG2.20084","url":null,"abstract":"A total of 65 new heat flow data were obtained based on newly determined thermal conductivity and collected temperature logging data. Using these data together with those from previous studies, we constructed a geothermal gradient map as well as a heat flow map for the northern marginal basins of the South China Sea. Furthermore, geothermal characteristics of these basins and their relationship with oil and gas field distribution were analyzed. The results show that the four sub-basins located in the northern South China Sea, namely the Pearl River Mouth Basin, Qiongdongnan Basin, Beibuwan Basin and Yinggehai Basin, are typical “hot basins” with average heat flow of 68.7±11 mW/m2, 71.1±13 mW/m2, 65.7±8.9 mW/m2, and 74.7±10 mW/m2, respectively. The overall heat flow distribution pattern in the study area, which gradually increases from the shelf to the slope corresponding with crust thinning trend, are generally controlled by regional tectonic setting. Meanwhile some high local heat flow anomalies are likely to be attributed to the fault and magmatic activities. The geothermal field may control and restrict oil and gas accumulation in the study area. In light of exploration results of these basins, we find that the gas fields are mostly located in the high heat flow basins (depressions) while the oil fields more likely lie in relatively lower heat flow basins (depressions).","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CJG2.20084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51212527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

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