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This 16 page Class Notes was uploaded by Jessica Braun MD on Saturday September 12, 2015. The Class Notes belongs to GEOL 554 at West Virginia University taught by Thomas Wilson in Fall. Since its upload, it has received 12 views. For similar materials see /class/202712/geol-554-west-virginia-university in Geology at West Virginia University.
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Date Created: 09/12/15
dhd Exploration Geophysics III Normalr 391 1 RayTracing tomhwilson tomwilsonnailwvuedu Depa ment of Geology and Geography West Virginia University Morgantown VW quxiwmmnwm phone source receiver lqyouf 6FOLD CDP REFL STACKING DIAGRAM V WemirginnUnpudg WanmunUmwmq STACKING DIAGRAM S 2 3 Vxxmmwu Mummy STACKING DIAGRAM 6 F LD CID eieiye39r39 string 1390 The right gt CONE OF RAYPATHS REFL AIBDE A a c n s r Iwumwnmumny n 7839 40 12 7 0H1 I V v V 72 gram 9 j flln Cwbma ou l 7 F H 7JO 1 I I ll0J8 Vwmmmuxman p oin r gather is hyperbolic 5 5 53 P2 Pg 2 S un4rr p tf s m wept 1K nality f J 7mm l V V K f 7mm 1354 quot A7 T nDeyaAmAn yzrd Us Pl39llv39 WWanmmky X w IV 1745 y Pm Tum Wilson Demm m39GeOng 1rd Ge gnyl39llv39 39VWWMUMW Crooked Line Effects Along crooked survey I n25 s iiie c mmon mid ini gainer ncludes all records whose midpoinis fall wiiiiin a m n radius of some 70 ni up g haunt mun im Jlld Km mmyum sun 5quot miiipuinn A an a an a mud In 5eth seiner m immune cu ma minimum in lr mwn pmhk ume man 1 unginiqim mnurmmtr pails m e awkd um hr quotIV I n mud n murmnuiwr pin d scum diminn Mnquot don in 5mm in K min III minim chr pram nd thry Dailyn landing i don wilh maimed do mi ism uh m rr aninn mngl Ipi spud To mwnm Di vxxinxiinnii him in Tmmnn DepmmufGen stdeeognth v xenvnnninuinimin 39 Se 0 and receivers relocate to the same midpoint hmwmmmwmmm mmg xxmvmmaummu CMP Rawaths FEE 30 to all that trauma FEEY V stlVAlgn nUmmmly Source Receiver OffSeT gt 77 quotPM quot 5 00 015 LeT39s assume ThaT The 0 F7 Tr39aces shown aT righT 0 n35 ar39e nmo cor39r39ecTed Tr39aces in a common MS midpoinT gaTher39 as O 65 They are all idenTical V Uab one However The real W35 1105 wor39ld doesn39T work This way We always have noise in our39 daTa VwmmmtMummy Pu r39e signal Noisy signal Here39s The same daTa seT wiTh a loT of noise Thr39own in NoTe so easy To see The signal in This case is H Tam stm39l Defa men nfGenlngyand Gengmphy IVVii iiglnmUmumu 77 3quot the trace number on 55 and is a speci c time n fwuwwm NEHm7 u A owe 57m 2a Wherel is v m E 2 r z a E 11 02775 025 035 My1w a st Huron Onondaga Tam lesm Department ufGenlagy mGeagaphy vVmigumumwm STack Trace Pure rmmin K Ewum w A mk 37mm n r E z 772 If we sum all The noisy Traces TogeTher sample by sample we geT The Trace ploTTed in The gap aT righT This summaTion of all 16 Traces is referred To as a sTack Trace NoTe ThaT The sTack Trace compares quiTe well wiTh The pure signal Tam wusm Department ufGenlagy deeagaphy vQgtllizinlUllluID FL 5chan EVENT The simulated normal incidence raypaths have the potential to provide a more accurate visual image of the subsurface xwvwmummuy zxznclszrv 50039 worrormnm n 4 4 a n 1 a u a u r Y Y 7 t39 y 4 ff mcxuss z W L I E I 1 rwummwssmnaw 3 1040 I I Mvmms I arcnmman scum TYPICAL EFLEC i ION My rA ms VWEIVnganimmuy 51 mums whats VEE39 39 so 9 WI 7 o I 3 A shot record Iii 39l VIeW Compare to the appropriate equations IMnWlAnmUnnmny GI CJg raw9 mumen fMIIML g nce 247 PM VMSIWHAUmwmly Imwynmunmny 440 DcAM cs azny S Y NQL N E Consider for example a survey across a synoline Consider the distribution of normal incidence raypaths VWSIWUNLUSII wamunmy Vvmmunmlg If you think this is only a theoretical construct think again Pity the poor souls that keeping drilling these anticlines IMslqunluUnnmlly We Will introduce the refraction response later VMSIWUWM 72m SEEDl Immutmmn Tm m wmumm We have intentionally not included diffraction events IWVIMnmUnnmlly Vustwmmmmg
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