Comprehensive Geophysical Methods Applied In Deep Geological Formations Coverage Area Is Divided In

Deep coverage areas are generally covered up to1000meters and Cenozoic above,divided geological structure in this area, the general tone of the geological work hardto achieve. Solve such problems either using drilling data, geophysical data or rely oninference. Although drilling is a direct and effective means, but the cost is huge, selectgeophysical work, the low cost, using geophysical coverage area in deep geologicalsurvey work means cost-effective means.This article describes the Case Comprehensive geophysical methods applied in deepgeological formations coverage area is divided in to the point on behalf of the face,provide reference for similar coverage area deep geological work. Combined with theactual situation and informative Tianjin degree, preferably aeromagnetic, gravity, theresults of the work of magnetotelluric sounding data, integrated analysis andinterpretation, inferred geological structure, stratigraphy and other information.With gravity and magnetic data processing results, the establishment ofmacro-geological structure model; vertical stratification in MT-based, cross-sectionalstructure established electrical; eventually build a comprehensive geological model.Gravity data processing, calculation of the gravitational vertical high-order derivative,the residual gravity anomaly, gravity anomaly horizontal directional derivative, andvertical upward analytical continuation high-order derivative, downward continuationand other information. Of magnetic anomaly data conversion and separation processes,calculate the flight magnetized pole aeromagnetic horizontal directional derivative,analytic continuation upward, downward continuation of its first vertical derivativeand so on. Summary analysis of gravity and magnetic anomalies, combinedmagnetotelluric profile data to infer the geological structure of the exhibition boutpoint and deep development patterns.Based on gravity data to derive two year low regional gravity anomaly, inferredfracture34; based on aeromagnetic data derived Jixian north magnetic high zone,three rivers~xin’anzhen magnetic low area and other regions of magnetic anomalyzone inferred fracture23Article. And magnetotelluric profiles combine to make amore detailed and accurate inference result.Through this study, the coverage area of Tianjin deep geological division of work,aeromagnetic, gravity, magnetotelluric sounding comprehensive interpretation ofgeophysical methods have better results. Each reference a variety of methods that cancompensate for the lack of a single method.