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ZondRes3d 是地球物探分析软件Zond的？橹，是一款三维高密度电法反演软件。

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Zondres3d法式旨在对陆地，跨孔垫层析成像电阻率和感应数据进行三维诠释和海洋变种。电层析成像是一种整体技术，蕴含现场观察步骤，处置和现场数据诠释技术。它的特点是屡次沉复使用 ，由于源和接管器只需固定在统一地位即可。这种步骤一方面能够使用现代高机能仪器，另一方面能够利用有效的建模和反演算法。为了诠释电子断层扫描数据，使用了二维和三维模型。由于与“经典”水平分层有很大的调查部门，它扩大了电力勘探解决问题的领域。电子断层扫描的分辨率和诠释质量与一个站点的丈量数据和密度亲昵有关。它们的数量通常达到一千，这就是为什么关于现场丈量效能的问题拥有底子性，并且在某些方面界说了这种步骤的现实使用可能性的原因。为了达到现场工作效能，使用了拥有自动编程的电自动切换职能的特殊设备。三维电子断层扫描技术是一种特殊的丈量技术，同时丈量数量达到一万次。但是在好多情况下，对于三维诠释，使用在几条平行概括线上接管到二维电子断层扫描。

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ZondRes3D法式的特点是其高资源利用与必要推算机的大尺寸正反问题解决规划的特殊性联系在一路。在法式中实现了两种解决电场推算正反问题的步骤 - 有限元法和有限差分法。有限差分法的工作速度约莫快2倍，但不允许使用地形。

ZondRes3d代表了电子断层能扫描的现成解决规划，解决了从数学建模和活络度分析到现场数据处置和诠释的宽泛问题。便捷的界面和各类数据可视化职能大水平解决各类地质问题。

ZondRes3d使用单一了然的数据体式，能够轻松组合各类观测系统，蕴含地形设置的分歧变体和其他附加信息。该法式合用于一些类型的电阵列（利用于电勘探）或其组合，还支持多所周知的数据体式。

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【英文介绍】

ZondRes3d program is designeed for three-dimensional interpretation of electrical tomography? resistivity and induced polarization data? in land, cross-borehole and marine variants.

Electrical tomography is a whole technique including the method of field observations and technology of processing and field data interpretation. Its feature is multiple reusing as a source and receiver just the same electrodes position, fixed on a site.

Such approach allows from one hand to work with a modern high-performance instruments, and on the other hand to apply effective algorithms of modeling and inversion. For interpretation of electrical tomography data two- and three-dimensional models is used . It significantly extends the range of electric prospecting solved problems due to sections investigating that are considerably different from «classic» horizontal-layered.

Resolution and thus interpretation quality of electrical tomography is closely connected with the number and density of measurements on one site. Their number usually reaches first thousand that is why the question on field measurements efficiency has basic importance and in many aspects defines possibility of practical using of this method. Special equipment with programmed automatic switching of electrodes is applied for reaching of maximum effectiveness of field works.

The technique of three-dimensional electrical tomography means a special measurement technique with use of a considerable number of switched electrodes (some electric prospecting cables) while number of measurements reaches ten thousand. But in many cases for three-dimensional interpretation it is enough to use the results of two-dimensional electrical tomography received on several parallel profile lines.

Feature of ZondRes3d program is its high resource using connected with specificity of the forward and inverse problem solution of big dimension that requires powerful computer. Two methods of solving forward and inverse problem of electric field calculation are realizes in the program – method of finite elements and method of finite differences. The method of finite differences works approximately twice faster, but doesn’t allow use a topography.

ZondRes3d represents ready solution for electrical tomography, and solves wide range of problems from mathematical modeling and sensitivity analysis to field data processing and interpretation. Convenient interface and variety of data visualization features allow solve wide range of geological problems with maximum effectiveness.

ZondRes3d uses simple and clear data format allowing easily combine various systems of observation, including different variants of the topography setting up and other additional information.

The program works with any (applied in electric prospecting) types of electrodes array (two, three and four – electrodes) or their combinations. Well-known data formats are also supported.

Special mode for working with middle gradient array is provided that allows to calculate quickly and visualize data in the form freandly for the interpreter.

Some variants of three-dimensional model display in the form of various sections and isosurfaces are realized in the program.

Important stage which prevents field measurement is mathematical modeling of geoelectric structure of work site. Modeling gives chance to estimate the level of the signal and to make a choice of optimum parameters of the observation system for decision of the set geological problem. ZondRes3d has great range of tools for mathematical modeling and analysis of fields sensitivity of DC and induced polarization.

As the general task of the program is inversion for geoelectric section parameters – some variants of inverse problem decision are realized in ZondRes3d; basic of them are: smoothing inversion – to get? smooth and focusing – to get piece-smoothed distribution of geoelectric parameters with depth.

While working out at the program special attention was paid to a priori data accounting. Because of equivalence of inverse geophysical problems, quality of the obtained results strongly depends on the amount of a priori data used. In ZondRes3d there is possibility of weights setting for measurements, fixing and limits making of changing features of different cells, using of a priori model as major in inversion. The robust schemas of noise estimation are realized in the software. There is also possibility to import and display results of measurements by other methods and cross-boreholes data that improve interpretation results.