The Study On Gravity Data Processing Methods In Potash Exploration

Potash is the crop yield nutrient, is also the national economy industries irreplaceableimportant chemical raw materials. Global potash reserves is not balanced, mainly in NorthAmerica, Europe, the Middle East and Asia, Thailand and other15countries. China'sPotassium Resources indigence, has proven reserves of potassium mineral industry onlyaccounts for0.47%of the world, since2010, has increased to more than10000000tons ofgap. China is one of the major countries of world potash imports accounted for about18.6%oftotal imports, domestic consumption, accounting for80~90%. Establish our country strongpotash resources guarantee system, in order to ensure the sustainable development ofagriculture has far-reaching strategic significance.The potash resources reserves is relatively insufficient and potassium consumption ofrapid growth, China has to enter the international potassium market, but the world has morepotential sylvite area basically is a few oligarch monopoly, can enter the main is the formerSoviet Union and the individual countries in Southeast asia. Laos has rich mineral resources,the government has formulated a series of mineral exploration, mineral development andmining industry development planning and investment projects, in the hope that the support ofthe international community, and has attracted a lot of attention. Beginning in2006, has beena domestic companies and the government of Laos signed potash exploration contracts, andobtained the achievement attract people's attention. In2008the Lao President Jumari duringhis visit to China and China reached a "resource for assets, promote bilateral economic andtrade cooperation" consensus, for Chinese enterprises to take the lead in" landing"international stage provides policy basis. Therefore, Lao mining development prospects.2006-2012Jilin University assumed four Laos sylvite mine exploration mission. Theauthor has favour three went to the scene, participate in the whole of the exploration process,accumulated certain experience, the study has certain base. The authors use in Laos in2006Gammon not measured data, and focus on gravity data processing method, especiallywavelet analysis in search for potash application study, hope to be able to reduce ourdependence on external potassium salt mine to make their due contribution. Specific work andresults are as follows:(1) The establishment of three different gravity anomaly model, the use oftwo-dimensional discrete wavelet/wavelet packet transform respectively to their regionalfield and local field separation. The test results show that: with the same model, selecting different wavelet gravity field separation with good effect, little difference between differentwavelet analysis; wavelet packet decomposition than wavelet decomposition is more precise,but can directly determine the low frequency component of wavelet decomposition andwavelet packet decomposition, need to build more accord with actual geological conditionsthe model to determine the frequency coefficient of.(2) To a variety of rules geological body caused by gravity abnormality by regional fieldand local field decomposition, make a variety of wavelet coefficients in the model of gravityfield in the decomposition of accuracy evaluation, through the comparison of the optimalwavelet and scale. The test results show that: the wavelet analysis Coiflets wavelet serieshigh precision, and the wavelet packet decomposition of Daubechies wavelet series highprecision.(3) Based on the model, corresponding to the selected wavelet packet to Laos sylviteexploration of the measured gravity data of regional field and local anomaly separation, andwith well logging data to do comparative interpretation.(4) In the study area and the analytic continuation of gravity data, direction derivative,apparent density inversion, Euler deconvolution and conventional data processing andthree-dimensional distribution characteristic analysis and wavelet analysis, and the resultswere compared, summed up the advantages and limitations of each method, and the data ofthe two process, found a new prospecting target area.(5) The results of drilling and geophysical, geochemical, geological data are compared,further validation of gravity prospecting in searching for the best effect of potash mine.(6) To potash in the exploration of gravity data processing method were summarized,pointed out the problem of existence and inadequacy, put forward suggestions for continuedresearch.