The Study And Application Of Non-seismic Geophysical Methods And Techniques In Oil And Gas Reservoir Detection In Qiangtang Basin

Recent years,the demand of petroleum resources is increasingprogressively in our country.At the same time, the filed ofoil exploration is enlarging too.Along with the progress ofseismic prospecting technology and associating with perfectunderground geology method ,the successful probability ofis enhancing persistently,but the price of all those isexorbitant exploration investment .All along,for advancingsuccessful probability of exploration,people are questingfor the detection method whether there are oil in closureor the delineative method that can reduce high-costexploration work space of oil and gas prospect .By a massof trial,we found:the abnormal information be acquired bysome non-seismic geophysical method is in contact withreservoir,and the abnormal information can detect whetherthere are oil and gas in oil trap.The paper studies the method of high precision aeromagneticsurvey detect directly oil and gas field The method ofapplication of geophysics and geochemical explorationtechiques to find out the microcosmic effect and abnormalityin oil and gas field,which we called as geophysics andgeochemical exploration techiques direct detectingreservoir.By using the method,we can disclosure whetherthere are oil gas gather in subsurface.The characteristicof the method is that,for seeking oil and gas field,it tryto found direct relation between reservoir and geophysicsabnormilty in oil and gas field.The primary differencebetween the method and other geophysics and geochemicalexploration is:it does not detect oil and gas field bystudying oil trap itself but oil gas stratum or derivant ofoil gas stratum.The micromagnetic aureole explorationstrategy of the article belongs to above-mentionedmethod ,which we used to forecast oil and gas in Qiang Tangbasin.The research try to detect oil and gas field by high precisionmicromagnetic abnormality,so the data-processing method isdifferent from conventional data-processing method.Theabnormal information has relation with structure of thereservoir,and the abnormal information is local and weak,sothe data-processing method we used should can separate thetarget field from synthesis superrimposed filed(thegravitational and magnetic effect is caused by local oil andgas structure).Also we should press or remove theinterferential information in superficial layer ,andenhance useful information.By this way ,we can improve theeffect by detect oil and gas field and pick-up micromagneticaureole abnormality and aeromagnetic abnormality,which weused to explain oil geology.The Qiang Tang basin is situated the hinterland in Qing Zanghighlang,there are an area of 160 thousand sq. meters. Alsothe exploratory grade in Qiang Tang basin is the lowest inland oil and gas basin in China.The paper conclude andexplain oil geology target in the basin by disposing andexplaining and reversion the high precision gravitationaland magnetic data in Qiang Tang basin,with thisunderstanding,we forecasted the oil and gas prospect in thebasin. The article we used micromagnetic aureole explorationstrategy to forecast oil and gas in Qiang Tangbasin.Furthermore ,we used up to date GM-SYS seismic,gravity/magnetic two-dimension analogue system.The systemoffered an effect means for geology problem in Qiang Tangbasin ,such as foundation base heave,possibly distibute ofvolcanic cinder and the probability of oil and gas prospectand so on.