ScienceDirect Topic Alert: Geophysics
//www.gstatic.com/images/branding/product/1x/groups_32dp.png
Study of the low-frequency dispersion of permittivity and resistivity in tight rocks Original Research Article

Journal of Applied Geophysics, Available online 8 June 2017, Pages

Hongqi Liu, Tian Jie, Bo Li, Deng Youming, Qiu Chunning

Graphical abstract

Fig. 1 Sw vs. DC at different concentrations. The general rule of exponent Dc is that at the same saturation, the higher the concentration is, the higher the value of Dc. Additionally, Dc is nearly unchanged as the saturation increases at the same concentration. Obviously, the concentration has a much greater effect on the resistivity frequency dispersion exponent than the saturation.

Fig. 2 Frequency dispersion of Cp @ concentration of 0.125mol/L. At low frequencies, Kc decreases rapidly. At the point f1, Kc is nearly equal to 1, and the corresponding frequency is 1.233Hz, Kc=1.000. After this point, the decrease in the velocity gradually slows down, and at point f0, the rate of change approaches zero and the corresponding frequency is 225.7Hz, and Kc=0.0055. The influence of the saturation on Kc is very weak, and the values of Kc are equal at different saturations.Image 1

The Cambrian-Ordovician boundary in the Tarim Basin, NW China: Geochemistry and geophysics data anomalies Original Research Article

Journal of Petroleum Science and Engineering, Available online 15 June 2017, Pages

Wang Hongyu, Gao Zhiqian, Hans G. Machel, Fan Tailiang, Wei Duan

Graphical abstract

The T80 unconformity in the Tarim Basin, NW China can be correlated with the Cambrian-Ordovician boundary in several other sections around the world. The detailed chemostratigraphic study and seismostratigraphic data of the Cambrian-Ordovician transition interval in the Tarim Basin are clarified. Sr element concentrations are used as a new tool for the identification and correlation of the unconformity. The lower Sr concentrations are closely correlated with the samples from the top of the Qiulitage Formation in close proximity to the T80 unconformity.Image 1

Modified electrical survey for effective leakage detection at concrete hydraulic weirs Original Research Article

Journal of Applied Geophysics, Available online 25 August 2017, Pages

Bomi Lee, Seokhoon Oh

Graphical abstract

The pattern of colored matrix that is created from tha data of a D-Lux array. (a) The potential distribution around the homogeneous weir and the D-Lux view that displays the homogeneous potential distribution at A, B and C in this case. (b) The potential distribution around the heterogeneous weir and the D-Lux view that displays the potential difference of A, B and C at that time. The black line box of each right figure shows the changes owing to potential variation.Image 1

3D characteristic analysis-based targeting of concealed Kiruna-type Fe oxide-apatite mineralization within the Yangzhuang deposit of the Zhonggu orefield, southern Ningwu volcanic basin, middle-lower Yangtze River metallogenic Belt, China Original Research Article

Ore Geology Reviews, Volume 92, January 2018, Pages 240-256

Xunyu Hu, Feng Yuan, Xiaohui Li, Simon M. Jowitt, Cai Jia, Mingming Zhang, Taofa Zhou

Graphical abstract

Here, we present a case study of 3D characteristic analysis-based prospectivity modeling for the targeting of mineralization associated with the Kiruna-type iron oxide-apatite type Yangzhuang iron deposit within the Zhonggu orefield of in the southern Ningwu volcanic basin (Jin, 2014; Ningwu Research Group, 1978). The workflow is the core guiding ideology of our work. During the metallogenic prediction, we tried to use characteristics analysis to deal with the 3D voxels data. This modeling outlines three distinct areas of high prospectivity outside of areas of known mineralization that are located to the west (target I), north (target II) and east (target III) of the known mineralization in this region. Our research shows that characteristic analysis can be used to generate 3D prospectivity models, and this technique should be considered for application to other deposit types and other Kiruna-type iron oxide-apatite deposit.