Geophysical and Geochemical Exploration Team

Fengcheng, China

Geophysical and Geochemical Exploration Team

Fengcheng, China
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Yuan B.-Q.,Xi'an Shiyou University | Yang G.-Y.,Xian West Approaches Geophysical Technology Development Co. | Liu J.-L.,Geophysical and Geochemical Exploration Team | Zhang C.-G.,Xi'an Shiyou University
Geological Bulletin of China | Year: 2014

In order to improve the effectiveness and practicability of sub-domain filtering method for identifying geological boundaries, the authors, based on the 1:50000 high precision data of gravity in EQ block of the Yin-E Basin, used small sub-domain filtering method, a total horizontal derivative method, and an improved small sub-domain filtering method combined with a total horizontal derivative method to process the gravity anomalies. The results of each method were discussed in this paper. Then the fault structures were inferred on the basis of the results obtained by the combined method. Compared with the interpretation results of the seismic and electrical profile, the combined method can prove the fault structures, which shows the significance and effectiveness of this combined method. Theoretical model test and practical application results show that the combined processing method sharpens the field source boundary, enhances the lateral identification capability, highlights the geological boundary features, and even makes the fault structural framework clearer. ©, 2014, Geological Bulletin of China. All right reserved.

Zhao J.-L.,Xi'an Shiyou University | Li X.-S.,Geophysical and Geochemical Exploration Team | Zhang B.,Yanchang Oilfield Company Ltd
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | Year: 2010

The well logging response characteristics for fluid property in reservoirs with low and extra low permeability are extremely complicated, as a result it is very difficult to conduct fluid detection and evaluation for those reservoir and ambiguity is always a big problem. Based on available data (core data, geology data and dynamic data) and principles of wavelet analysis and Hilbert Transform, forward model was established, wavelet deposition and reconstruction were conducted, for trend information which could better reflect fluid property change, Hilbert transform was applied, then amplitude spectrum and phase spectrum for the trend signals were calculated and then were analyzed, then based on wavelet deposition and reconstruction, as well as Hilbert transform the relationship between spectrum characteristics and fluid property was obtained. The study results show that the wavelet reconstructed signal for the routine well logging curve could better reflect vertical distribution characteristics of the fluid properties, while the amplitude spectrum and phase spectrum of the wavelet reconstructed well logging curves for which Hilbert Transform was conducted could clearly disclose vertical change and difference for the fluid properties, the new method was applied in Erodes Basin, and excellent results ware achieved there.

Li C.-I.,Geophysical and Geochemical Exploration Team | Chen J.,Geophysical and Geochemical Exploration Team | Guo W.-B.,Geophysical and Geochemical Exploration Team
Wutan Huatan Jisuan Jishu | Year: 2012

Xiaoqinling region has favorable geological conditions in ore forming, which is rich in mutimetal minerals. The paper uses canal system secondary halo to keep statistics and analysis on the geochemical anomaly, and summarizes geochemical anomaly characteristic and the element association pattern as well. This paper also proposes six prospecting prediction areas according to the surplus anomaly weight of Au element and the local geological environment, which is to provide feasible directions for prospecting further metallogenic provinces.

Liu J.-L.,China University of Geosciences | Shen A.-B.,Geophysical and Geochemical Exploration Team | Chen X.-L.,Geophysical and Geochemical Exploration Team | Chen X.-L.,Chang'an University
Geological Bulletin of China | Year: 2011

Based on data processing and qualitative analysis of seven magnetotelluric sounding profile, take Carboniferous-Permian as the main purpose layer, the authors implement oil gas geological investigation in Yingen-Ejin Banner basin. We have established seven gravity magnetoelectricity comprehensive inversion profile drawing in the synthesis information inversion and formation of image. Taken the well drilling, the seismic and the regional geology investigation material as the constraints, we have determined the electrical layer demarcation and the explanation basic principle. We have accurately decided the Mesozoic strata of buried depth and thickness using low resistivity marker accurate boundary of the magnetotelluric sounding inversion electronic resistivity, the second high-lever resistance layer semi-quantitative depicted Carboniferous-Permian's distribution. We have divided the section plane geological horizon, and summarized systematically the strata and electrical characteristics in the research area. Research results show that magnetotelluric sounding is an important way to obtain distributed characteristics of Mesozoic and Paleozoic. In Yingen-Ejin Banner basin's complex geology and desert area bad working conditions, magnetotelluric sounding demonstrated the good exploration effect and the obvious superiority, played the influential role for Carboniferous-Permian oil gas geological investigation in this area.

Liu L.-F.,Geophysical and Geochemical Exploration Team
Wutan Huatan Jisuan Jishu | Year: 2014

At present, RGMapGIS system has been widely used in geological industry. This paper mainly discusses the advantages and simple steps of RGMapGIS system compares to Suffer, MapGIS, GeoExplor software in dealing of geochemical data and maps, which achieves a simple efficient and accurate calculation of the standard deviation, abnormal lower limit etc and drawing of plan isoline graph, orthographic drawings etc, and help to analyze and interpret correctly abnormal in order to determine the target for further geological exploration work.

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