Maitiro Ekuongorora Geophysical Ekutsvaga Migodhi
Kuongorora migodhi inhanho inokosha usati watanga kuchera. Panguva ino, kambani kana timu yekuongorora inotsvaga kunzwisisa mamiriro epasi pevhu: uko kune matombo anowanikwa, huwandu hwawo, mhando yawo, uye njodzi dzinogona kuitika nekuchera. Imwe yenzira dzinoshanda kwazvo dze "kuona" pasi pevhu pasina kuchera zvakanyanya ndeyekuongorora geophysical. Matekiniki ekuongorora geophysical anoshandisa musiyano muhunhu hwematombo chaiwo - senge density, magnetism, electrical conductivity, uye wave propagation speed - kuratidza chimiro uye mukana wekuti mineralization iwedzere.
Basa reGeophysics muKutsvaga
Ongororo dzeGeophysical dzinoshanda sebhiriji pakati pemapu epamusoro penyika uye kuchera. Nekuti kuchera kunodhura zvakanyanya, geophysics inowanzo shandiswa kutetepa zvinangwa uye kugadzirisa nzvimbo dzekuboorera. Uyezve, data regeophysical rinobatsira kududzira maumbirwo egeology akadai sezvikanganiso, mapete, kupinda, uye nzvimbo dzekuchinja kwemvura inopisa, izvo zvinowanzo dzora kuumbwa kwezvicherwa. Nekugadzira kwakakodzera kwekuongorora, geophysics inogona kuwedzera mikana yekuwana zvinangwa zvehupfumi uku ichideredza njodzi dzekutsvaga.
Kazhinji, nzira dze geophysical dzakakamurwa mumapoka makuru akati wandei: nzira dzinogona kushandiswa (giravhiti nemagineti), nzira dzemagetsi nemagineti (resistivity, IP, EM), nzira dze seismic, uye nzira dze radiometric. Sarudzo yenzira inoenderana nerudzi rwedhipoziti, kudzika kwechinangwa, mamiriro enzvimbo, uye bhajeti nenguva.
Ongororo yeMagineti: Kutevera Zvisina Kunaka zveMagineti
Nzira dzemagineti dzinoratidza kusiyana kwesimba remagineti rePasi, iro rinokanganiswa nehunhu hwemagineti hwematombo, kunyanya huwandu hwezvicherwa zvemagineti zvakaita semagnetite. Mukutsvaga migodhi, ongororo dzemagineti dzinoshandiswa zvakanyanya ku:
1. Kugadzira mamepu ekupinda kwematombo eigneous anowanzobatanidzwa nekugadzirwa kwemineral.
2. Kuonekwa kwezvivako zvakaita sezvikanganiso kana kubatana kwe lithological.
3. Kutsvaga simbi (semuenzaniso magnetite) uye mamwe ma sulfide deposits makuru ane mhinduro yemagineti.
Ongororo dzemagineti dzinogona kuitwa pasi (dzemagineti pasi), dzinofambiswa nemhepo (dzinofambiswa nemhepo), kana kushandisa madrone. Nzira iyi inokurumidza, uye mutengo pa km² unowanzova wakaderera munzvimbo dzakakura. Zvisinei, dudziro yayo inoda kungwarira, sezvo kusagadzikana kwemagineti kunogona kubva kunzvimbo dzakawanda uye dzimwe nguva hakumiriri zvakananga hupfumi hwezvinhu.
Nzira Yekukwevera Simba: Kuyera Kusiyana Kwehuwandu
Nzira dzekukwevera pasi dzinoyera kusiyana kwekumhanya kwesimba regiravhiti nekuda kwekusiyana kwekuwanda kwematombo ari pasi pevhu. Nzvimbo dzakakora kwazvo (dzakadai sesimbi) dzinogona kugadzira zvinhu zvisina kunaka zvinokwevera pasi, nepo nzvimbo dzekuchinja kana matombo ane maburi anogona kugadzira zvinhu zvisina kunaka. Simba regiravhiti rinobatsira pa:
- Kuona matombo ane density yakawanda.
– Kugadzira mapa emadhaka emvura, nzvimbo dzakapinda, kana zvivakwa zvemunzvimbo.
– Zvidzidzo zvikuru zve geology zvisati zvaitwa ongororo dzakadzama.
Muganho wenzira yekukwevera pasi unowanzova wekusagadzikana kwakaderera pane dzimwe nzira, kunyanya kune zvidiki uye zvisina kudzika. Uyezve, kugadziriswa kwedata (topography, kudhonzwa kwemidziyo, uye mafungu) kunofanirwa kuitwa nokungwarira kuti pave nemhedzisiro yakavimbika.
Nzira yekudzivirira: Kugadzira Mepu yeKufambisa Dombo
Nzira yemagetsi yekudzivirira inopinda muvhu uye inoyera mutsauko unogona kuitika kuti iverenge kudzivirira pasi pevhu. Matombo akapfuma mumvura, ivhu, kana zvicherwa zvinofambisa mvura anowanzova nekudzivisa kwakaderera. Mukutsvaga migodhi, kudzivirira kunowanzo shandiswa ku:
– Kugadzira nzvimbo dzekuchinja (semuenzaniso nzvimbo dzevhu nekuda kwekuchinja kwemvura inopisa).
– Tsvaga mitsetse yezvivakwa inova nzvimbo dzakatyoka kana kuti dzine mineralization.
- Zvidzidzo zveGeotechnical uye hydrogeological zvakakosha pakuronga migodhi.
Magadzirirwo ema electrode anosiyana (Wenner, Schlumberger, Dipole-dipole), imwe neimwe ine zvakanakira pakudzika kwekupinda uye kugadziriswa kwemativi. Kudzivirira kunoshanda kune zvinangwa zvisina kudzika kusvika pakati nepakati, asi mhedzisiro yekusiyana kwenzvimbo uye mamiriro evhu inofanira kutariswa.
Kukonzereswa kwePolarization (IP): Kiyi yeKunaya kweSulfide
Induced Polarization (IP) inzira inozivikanwa zvikuru yekutsvaga zvicherwa zvesulfide zvakaparadzirwa, zvakaita sezvinowanikwa mu porphyry copper-gold deposits. IP inoyera kugona kwedombo kuchengetedza chaji yemagetsi kwenguva pfupi (chaji). Zvicherwa zvesulfide nezvimwe zvicherwa zvevhu zvinogona kuratidza mhinduro yakakwira yeIP.
Mabhenefiti makuru eIP:
– Inonzwa sulfide dzakapararira dzinonetsa kuona kana dzichishandiswa ne resistivity yakajairika.
- Zvinogona kubatsira kusiyanisa nzvimbo dzine zvicherwa kubva kumatombo akapoteredza.
Zvisinei, kududzirwa kweIP kunofanirwa kubatanidzwa neruzivo rwe geological, sezvo simbi dzekuchinja dzinogonawo kukonzera kusagadzikana. Kubatanidza IP ne general resistivity kunoshandiswa kuvandudza kururama kwechinangwa.
Nzira dzeElectromagnetic (EM): Kubata MaConductor eSubsurface
Nzira yeEM inoshandisa electromagnetic field induction kuona kufambisa kwemhepo pasi pevhu. EM inoshanda pakutsvaga mafambiro emhepo akadai semasulfide makuru, graphite, kana nzvimbo dzine mvura yakawanda. Mukutsvaga, EM inowanzo shandiswa ku:
- Kutsvaga ma sulfide makuru (VMS, Ni-Cu sulfides).
- Mepu yemuchina wekufambisa zvinhu kubva pakadzika kusvika pakati nepakati.
- Ongororo dzinokurumidza dzenzvimbo dzakakura (kunyanya mhepo inovhuvhuta mhepo).
Kune mhando dzakasiyana dzeEM: Time Domain EM (TDEM), Frequency Domain EM (FDEM), uye nzira dzeVLF. Sarudzo yenzira inotsamira pahudzamu hwechinangwa uye mwero wekusiyana kweconductivity. Dambudziko nderekuvapo kwe "ruzha" kubva muzvivakwa zvesimbi, fenzi, kana tambo dzemagetsi.
Nzira dzeKutenderera: Maitiro ekuverenga ane Mafungu
Maitiro eSeismic anoshandisa mafungu anonamira kuti aratidze zvidimbu zvepasi pevhu uye maumbirwo zvichibva pakusiyana kwekumhanya kwekupararira kwemafungu. Mukuchera, maitiro eSeismic anoshandiswa pa:
- Kugadzira mamepu ezvivakwa zvakaomarara zvakaita sezvikanganiso zvikuru zvinokanganisa dhizaini yemugodhi.
- Kuongorora ukobvu hwakawandisa uye miganhu yematombo epasi.
- Mune zvimwe zviitiko, zvinobatsira kuongorora hunhu hwenzvimbo yakachengetwa kana musiyano we impedance wakakwana.
Kutenderera kwenyika kune simba guru, asi mari yekutora nekushandisa data inowanzo kuve yakakwira kupfuura dzimwe nzira. Nzvimbo dzakakombama kana dzine ruzha zvinogonawo kuomesa ongororo.
Radiometry: Kuverenga Zvinhu Zvinoshanda Mumhepo Zvinoitika Zvichiitika
Ongororo dzeRadiometric dzinoyera mwaranzi yegamma yechisikigo kubva kuzvinhu zvakaita sepotassium (K), uranium (U), uye thorium (Th). Nzira iyi inoshandiswa zvakanyanya muongororo dzemudenga dzekugadzira mapu edunhu. Radiometry inobatsira pa:
- Lithology uye kuchinja mamepu (semuenzaniso potassic mumasisitimu eporphyry).
- Kuzivikanwa kwenzvimbo dzine uranium yakawanda kana zvimwe zvicherwa zvine chekuita nemwaranzi.
Nzira iyi inoshanda pakugadzira mapu epamusoro pevhu nekuti masaini egamma haapindi zvakadzika. Saka, radiometry ndiyo yakakodzera sechishandiso chekutanga chekugadzira mapu pane sechishandiso chekuona kudzika kwematombo.
Kubatanidzwa kweData uye Kufamba Kwebasa reKutsvaga
Ongororo dzezvepasi penyika hadziwanzowanikwe dziri dzoga. Kutsvaga kunobudirira kunowanzo bva mukubatanidzwa: geology, geochemistry, kure sensing, uye geophysics zvakabatanidzwa kuita 2D/3D model. Muenzaniso wekushanda kwakajairika:
1. Zvidzidzo zvemunzvimbo: kududzirwa kwemifananidzo yemagnetic + radiometry + satellite.
2. Kuongororwa kwechinangwa: EM kana IP kuti uone kuti kondakita/kuchaja zviri nyore.
3. Ongororo yakadzama: 2D-3D resistivity/IP kana ground EM munzvimbo yekutarisa.
4. Kusimbisa: kuchera pane zvisina kurongeka, kucherwa kwematombo emugodhi nepasi pevhu.
5. Kuenzanisa zviwanikwa: kubatanidzwa kwedata rekuchera nerezvepasi penyika yemhando dzezvepasi.
Nemaitiro aya, zvisarudzo zvekudzidzira zvinova neruzivo rwakawanda, kwete kungoedza rombo rako chete.
Matambudziko uye Maitiro Akanakisisa
Kunyange zvazvo zvichibatsira zvikuru, ongororo dze geophysical dzine matambudziko: kusasiyana kwetsananguro (chinhu chimwe chete chisingawanzoitiki chinogona kuva nezvikonzero zvakawanda), kukanganisa kwenzvimbo, uye kusagadzikana kwevanhu. Nokudaro, nzira dzakanakisisa dzinoshandiswa dzinosanganisira:
- Kugadzira ongororo yakanangana (nzvimbo yekutevera, nzira, kudzika kwekuongorora).
- Kugadzirisa uye kudzora mhando yedata remumunda.
- Kubatana nedata rezve geology kudzivirira rusaruro rwekududzira.
- Kuedza kutevedzera 2D/3D uye kunzwisiswa kwemamiriro ezvinhu kuti uongorore mamiriro ezvinhu anogona kuitika.
Penutup
Matekiniki ekuongorora geophysical ave chinhu chakakosha pakutsvaga migodhi yemazuva ano. Nzira dzemagineti negravity dzinoshanda pakugadzira mapu enzvimbo uye pakuvaka zvivako zvikuru, nepo resistivity, IP, neEM zvichishanda pakutsvaga nzvimbo dzine mineral conduction kana sulfide. Seismic inopa resolution yepamusoro kune zvivako zvakaoma, nepo radiometry ichibatsira pakugadzira lithology uye shanduko pamusoro. Chinokosha pakubudirira chiri mukusarudza nzira chaiyo, kuwana data remhando yepamusoro, uye kubatanidzwa kwakasimba kwemarudzi akawanda. Izvi zvinoita kuti kutsvaga kuitwe zvinobudirira, zvakachengeteka, uye nemukana mukuru wekuwana zviwanikwa zvemineral zvinokosha mune zvemari.
