Magnetic data processing for hydrocarbon exploration in the Pannonian Basin, Yugoslavia

Abstract

Because magnetic minerals may directly indicate the presence of oil and gas deposits, magnetic methods are applied to hydrocarbon exploration in oil‐bearing sedimentary basins. The basic problem in applying these methods is the isolation of weak magnetic anomalies sourced by low concentrations of the magnetic minerals present. These weak anomalies are often masked by much stronger magnetic anomalies caused by underlying magnetic rocks and/or by rocks in the basin sediments. Weak local anomalies can efficiently be isolated by applying selective 1‐D digital frequency filters. The method of filtering has been checked by data obtained using simple models of magnetic sources and using a model representative of the local geology in our study area in the southern Pannonian basin, Yugoslavia, The magnetic field frequency content was analyzed by applying the power spectral density estimation, using the maximum entropy method. The digital filters were designed using the window function method. The best results were obtained by the Kaiser window function for the chosen range of the band‐pass filter. In our study area, me isolated local magnetic anomalies have amplitudes of ±10 nT and trend in an east‐west direction parallel to the predominant structural grain. These anomalies correlate very well with the known oil and gas fields. As an example, filter processing of magnetic anomaly data, combined with the 3‐D seismic data gained in the filtered magnetic field, correlate well with one of the oil fields. The next phase of the project will concentrate on the anomalies occurring outside the established gas and oil fields.

Mapping potential hydrocarbon sites in Upper Assam shelf using geospatial and geo-structural techniques

“…Therefore, the presence of hydrocarbon reservoir indicates high magnetic values and study area shows value ranging from 33,100 to 34,400 nT (Figure 15). High magnetism can also indicate the presence of shallow basement region but as gravity data is low which indicates that the basement is not shallow (Burazer et al, 2001) (Jiang, 2012). Both gravity and magnetic data was converted to contour map in ArcGIS and later converted to respective values.…”

Closed-form solution of magnetic field and magnetic gradient tensor for magnetic minerals

“…Using the measured anomalous magnetic signals which can be collected by ground, airborne, borehole, marine and satellite surveys, geophysicists can speculate the location, the magnetization intensity and the geometry of the magnetized minerals and rocks. Therefore, the technique of using magnetization characteristics of rocks or the magnetic exploration method 2,3 are widely applied in studies of ancient climate [4][5][6][7][8] , sea-floor spreading 9,10 , military and civilian objects detection [11][12][13][14][15] , oil and gas exploration [16][17][18] , and regional crustal imaging [19][20][21][22][23][24] , and planet structures [25][26][27][28] .…”

Full Tensor Eigenvector Analysis on Air-Borne Magnetic Gradiometer Data for the Detection of Dipole-Like Magnetic Sources

“…Xia et al suggested a moving hum filter to suppress the rotor noise in helicopter-based airborne systems for the detection of UXO [ 17 ]. Burazer et al suggested using a FIR filter to extract weak anomalies from data that were measured at high-altitude air-borne magnetometer system [ 18 ]. As Billings and Wright analyzed, a large sensor and target stand-off distances of an airborne magnetometer system will result in a reduction in the amplitude anomalies [ 15 ].…”