Simulation Of The Geological Model Of CSAMT Method In Basalt Covered Areas

Controlled source audio magnetotelluric method referred CSAMT, the method uses manual transmission source,so it has a strong anti-interference ability and high signal to noise ratio. Since the detection of great depth(about 2Km)and it has a profile and sounding dual nature, in recent years played an important role in the exploration of oil and gas, mineral, geothermal and geophysical city.Present in the actual production, CSAMT method commonly used scalar measurements, requirements survey line perpendicular to the direction of cloth measuring structure. In the Changbai Mountain area, because far from the Late Pliocene, the Changbai Mountain area after many of volcanic activity, surface covered with a large area of basalt,unable to determine structural trend. Which inversion mode can not be judged on the scalar data obtained by one-dimensional, two-dimensional inversion processing is more accurate results. Made to work in the Changbai Mountain area of further analysis and interpretation caused great distress.Therefore, the establishment of three-dimensional geological model, applications CSAMT dimensional numerical simulation program forward. Research survey line and parallel structural trends, was 45 ° and one-dimensional, two-dimensional inversion vertical three cases, do a comparative analysis of the results.1. When the survey line perpendicular structural trend cloth measuring two-dimensional inversion for more than one-dimensional inversion depth, shape, and electrical parameters of anomalous body retrieval is more accurate, abnormal increase in body length extending the movie is not the case;2. When the survey line and strike anomaly was 45 °, one-dimensional and two-dimensional inversion and inversion of vertical situation inversion anomaly effects are basically the same, in the right side of a one-dimensional anomaly, are two-dimensional inversion of false abnormal high resistance compared with the vertical, the abnormal high resistance value will be increased, increasing the extension of the length of the anomalous body, the right side of a one-dimensional inversion anomaly abnormal high resistance value is significantly reduced, D inversion anomalies the right of the high resistance anomaly disappears;3. When the survey line parallel to the anomaly, two-dimensional and one-dimensional inversion inversion approximation, exhibit a layered structure. Abnormal body length is limited, due to the effect of the charge, in both sides of the body showed obvious exception of high resistance anomalies.