Study Of The Gravity And Magnetic Field In Hailaer Basin

Hailar basin is located in Central Asia-Mongolia aulacogen Cenozoic Basins inNortheast China is an important petroliferous basins. According to the Daqing Oilfieldforecast, the amount of resources of the basin potential28×108t, take over the mostimportant region heral Basins increasing reserves and production, exploration potential.However, the current level of exploration is still very low, the resources proven rate of lessthan10%. Hailar basin structure and tectonic evolution of research results and explorationactually there is a big error, so far, no one has a comprehensive and systematic study thestructural characteristics of the Hailar Basin. In this paper, the corresponding data processingthe the1:20w Bouguer gravity anomaly data and the1:20w aeromagnetometer informationin Hailar Basin. Geological data and the results of previous studies, divided the main faultsand tectonic units of the study area, a certain amount of gravity and magnetic basis for theHailar Basin oil and gas exploration and construction work.To get more construction and oil and gas information from the raw data, this paperfocuses to do the research in the following two areas:1. Boundary identification: the determination of the geological boundary in the regionalgravity and magnetic data processing is a very important element, whether it is the division oftectonic units, fracture location identification, or different lithologies distinction needs todetermine the geological boundary. Therefore, the precise positioning of the geologicalboundary is of great significance for the analysis and interpretation of the geophysical data.On the basis of previous studies to a new boundary identification method-the obliquestandard deviation method, model test, the gradient method with respect to the overall level of,thetamap law and the NSTD (normalized standard deviation of the Act) superiority. Inpractical applications also further validate the usefulness of the method.2. Gravity normalized total gradient method to search for oil and gas: Gravity overalldegree of normalization method to find oil and gas, without too much physical parameters andgeological constraints, the original gravity anomalies in a simple and effective treatment canbe semi-quantitative gravity anomaly source of information. Typical hydrocarbon top of theanticline there is a quality loss, gravity normalized full gradient contour map on the minimumvalue, maximum value appears on both sides, that is, between two high and one low"characteristics, is looking for oil and gas signs. Abnormal downward continuation of the gravity gradient normalized total core cast dot pitch in the traditional computing model islimited and unstable. Taylor series iterative method is introduced to the gravity the normalizedgradient calculation to improve the stability and accuracy of the calculation. The second bodyanticline model and the three-dimensional sphere crown simulation verifies the advantages ofthis method.In practical applications, the the oblique standard deviation method, supplemented byEuler deconvolution and kid-domain filtering method fault structure of the study area to bedivided, calibration out of the16main fracture, which is a broken one6, two fracture,combined with geological data to determine these faults cutting relations and class times. Thestudy area was divided into five one tectonic units according to the gravity and magnetic fieldcharacteristics and depending on the physical properties of the inversion results will be furtherdivided into16sunken, raised a total of20two tectonic units.2011Songliao Basin andperipheral Upper Paleozoic petroleum geology research project to Ke Erlun-the Matsubaraline gravity data Bayanhushu depression and Wuerxun Depression segment, based on thegravity of the Taylor series iterative method normalized total gradient calculation. Thebinding portion drilling information, calibration possible oil and gas reservoirs constructedarea. The the Hailar Basin large-scale gravity and magnetic exploration extent is still not high,I believe that this study can provide an important reference for the geological survey in thearea and energy exploration work.