Kuzivikanwa kweTectonic Structures Uchishandisa Geophysics
Pendauluan
Zvivako zveTectonic—zvakadai sezvikanganiso, makomba, nzvimbo dzakatyoka, uye miganhu yemaplate—zvinhu zvakakosha zvinodzora mafambiro eganda rePasi. Zvivako izvi zvinoita basa guru mukuumbwa kwemakomo, maitiro ekupararira kwekudengenyeka kwenyika, zviitiko zvekuputika kwemakomo, uye kuunganidzwa kwezviwanikwa zvechisikigo zvakaita sehydrocarbons, simba re geothermal, uye zvicherwa. Zvisinei, zvivako zvakawanda zvetectonic hazvionekwe pamusoro kana kuti hazvifukidzwi nemarara madiki, zvinomera, mvura, kana mabasa evanhu. Apa ndipo panova chishandiso chakakosha che geophysics: inotibvumira "kuona" pasi pevhu nenzira isina kunanga kuburikidza nekuita kwematombo kumasimba, mafungu, uye nzvimbo.
Geophysics inosanganisa kuyerwa kwemunda, kugadziriswa kwezviratidzo, kutevedzera, uye kududzirwa kuti iwane maparamita ari pasi pevhu akadai se density, wave velocity, resistivity, uye magnetism. Vachishandisa maparamita aya, masayendisiti e geoscientist anogona kuona geometry uye hunhu hwemaumbirwo e tectonic, kusanganisira kudzika kwawo, kutungamira, kutsveyama, uye kuramba kwawo.
Pfungwa Yekutanga: Nei Zvivako zveTectonic Zvichionekwa muGeophysical Data
Zvivako zveTectonic zvinopesvedzera hunhu hwematombo. Semuenzaniso, zvikanganiso zvinogona kukonzera nzvimbo dzakapwanyika uye dzakazadzwa nemvura. Nekuda kweizvozvo, kumhanya kwemafungu epasi kunoderera, resistivity inochinja (kazhinji inodzikira kana ikazadzwa nemvura ine munyu/inopisa), uye density inogona kuderera. Mafuro anogona kuchinja mafambiro ematombo, zvichikonzera maitiro akasiyana ekuratidzira kwepasi uye kusiyana kwekusagadzikana kwesimba remagetsi. Kupinda kweMagma munzvimbo dzetectonic kunogona kugadzira magnetic anomalies uye densities yakakwira, pamwe nekuchinja seismic wave attenuation.
Nekuda kwehukama uhwu, dudziro ye geophysical inowanzo tarisa:
1. Musiyano wehunhu hwemuviri pakati pezvikamu zvematombo.
2. Kusaenderera mberi kana kuchinja kamwe kamwe (chiratidzo chemhosva).
3. Mapatani ejiyometri (semuenzaniso ma anticlines–synclines mu data reflection).
4. Kutarisa kweAnisotropy uye kukweva kwetsanga zvine chekuita nekushushikana kwetectonic.
Nzira yeKutenderera Kwepasi: Chishandiso Chikuru Chekugadzira Mepu Yekuvaka
Nzira dzekusimudzira kudengenyeka kwenyika dzinoshandisa kupararira kwemafungu anonamira mukati mePasi. Pane nzira mbiri dzakakosha:
1) Kufungisisa Kwepasi Pose
Kutenderera kwepasi kwechiedza kunoshandiswa zvakanyanya mukutsvaga mafuta negasi, asi kune simba guru pakugadzira mapu ezvimiro zve tectonic. Mafungu anoburitswa kubva kunzvimbo (semuenzaniso, vibroseismic kana controlled blast), uye kuratidzwa kwawo kunonyorwa ne geophones/hydrophones. Kuchinja kwe acoustic impedance pakati pezvikamu zvinogadzira mappable reflectors. Zvikanganiso zvinoonekwa se shifting reflectors, reflection terminations, kana chaotic zones. Mafolds anoonekwa se curved reflector patterns.
Kunaka kwekudzika kwepasi kwechiedza ndiko kugona kwayo kupenya kwepamusoro, uko kunogona kuratidza zvikamu zvezvikamu kusvika makiromita akati wandei. Matambudziko anosanganisira kudhura kwakanyanya, kugadzirisa kwakaoma, uye mhando yedata inogona kuora munzvimbo dzine makomo kana matombo akakombama zvakanyanya.
2) Kugadziriswa kweMafashamo neKuongororwa kweMafashamo
Kuchinja kwepasi kunoshandisa mafungu anodzorwa pamiganhu yekukurumidza kukuru. Pazvikero zvisina kudzika kusvika pakati nepakati, nzira iyi inoshanda pakuona kudzika kwedombo, ukobvu hwesediment, uye nzvimbo dzisina kudzika. Panguva iyi, seismic tomography—pazvikero zvemunharaunda nematunhu—inogadzirisazve kusiyana kwekukurumidza kwe2D/3D kubva kumafungu akawanda. Nzvimbo dzine njodzi dzinowanzoonekwa senzvimbo dzine kumhanya kushoma dzinokonzerwa nekutyoka uye mvura.
Panyaya yekuongorora mafambiro enzvimbo, passive seismic tomography inobatsira pakugadzira ma subduction slabs, nzvimbo dzekunyungudutsa, uye miganhu yemaplate.
Nzira Yekukwevera: Kuverenga Kusiyana Kwehuwandu
Ongororo dzegravity dzinoongorora kusiyana kwekumhanya kwesimba repasi kunokonzerwa nekusiyana kwekuwanda kwepasi pevhu. Zvivakwa zveTectonic zvinogona kugadzira kusiyana kukuru kwehuwandu: mabheseni e sedimentary anowanzova nekuwanda kwakaderera pane matombo epasi, nepo kupinda kukuru kunowanzova nekuwanda kwakakwira.
Chikanganiso chikuru chinogona kupatsanura mabhuroko maviri ehuwandu hwakasiyana, zvichigadzira gradient yakapinza isina kujairika. Mapete nemabheseni zvinogona kugadzira mapatani asina kujairika anoenderana ne geometry yepasi pevhu. Simba rekukwevera pasi rinobatsira zvikuru pakugadzira mapu edunhu, kuona kudzika kwebasement, uye kuona mabheseni e tectonic.
Dambudziko nderekusajeka: kusarongeka kwegiravhiti kunogona kugadzirwa nekusanganiswa kwakawanda kwemaumbirwo nekuwanda. Nokudaro, kududzirwa kwegiravhiti kunowanzo sanganiswa neruzivo rwepamusoro penyika, kudengenyeka kwenyika, kana ruzivo rwetsime.
Nzira dzeMagineti: Magadzirirwo eTrace muMatombo ane Magneti
Nzira dzemagineti dzinoratidza kusiyana kwesimba remagineti nekuda kwekuvapo kwemaminerari emagineti (semuenzaniso, magnetite). Zvivakwa zveTectonic zvakaita sezvikanganiso zvinogona kutsiva matombo ane hunhu hwemagineti hwakasiyana, zvichigadzira kusagadzikana kwenguva refu. Munzvimbo dzine makomo anoputika kana crystalline basement, magnetic fields dzinoshanda zvakanyanya pakutevera miganhu ye lithological uye mapping intrusions dzinowanzobatanidzwa nenzvimbo dze tectonic.
Kuongororwa kwezvakatorwa, kuderedzwa kusvika padanda (RTP), uye kutaramuka kwegiraidhi yegiraidhi zvinowanzo shandiswa kunatsiridza zviratidzo zvemuganhu nezvikanganiso. Kune rumwe rutivi, zvidimbu zve sedimentary zvisina simba muzvicherwa zvemagineti zvinowanzo buritsa mhinduro dzisina kusimba, zvichiita kuti nzira idzi dzishande zvakanaka munzvimbo dzine matombo egineti.
Nzira dzeGeoelectric neElectromagnetic: Kubata Mvura uye Nzvimbo Dzakapwanyika
Nzvimbo dzine zvikanganiso nenzvimbo dzakatyoka dzinowanzo shanda senzira dzekuyerera kwemvura—mvura yepasi, matsime emvura inopisa, uye maburi emvura inopisa. Nekuti mvura inokanganisa zvakanyanya resistivity, nzira dze geoelectrical/EM dzinobatsira zvikuru.
1) Kuramba (ERT)
Magetsi Anodzivisa Kudonha Kwemvura (ERT) anoratidza 2D/3D resistivity pamazinga asina kudzika. Nzvimbo dzisina kudzika dzinogona kuonekwa senzvimbo dzisina kudzika (kana dzakazara nemvura dzinofambisa mvura) kana nzvimbo dzine kudzika (kana dzakazara nemhepo/quartz yakaoma), zvichienderana nemamiriro enzvimbo. ERT inoshanda pakugadzira mapaipi asina kudzika, nzira dzekuyerera kwemvura, uye hukama hwezvivakwa neaquifers kana geothermal manifestations.
2) Magnetotelluric (MT)
MT inoshandisa kusiyana kwechisikigo mumunda wemagetsi wePasi kuti iongorore resistivity kusvika pasi peganda uye kunyange pamusoro pemachira. MT ine simba rekuona nzvimbo dzinofambisa mvura dzine chekuita nemvura, ivhu rakachinjwa ne hydrothermally, kana nzvimbo dzakanyunguduka zvishoma. Muzvidzidzo zve tectonic, MT inowanzo shandiswa kuteedzera nzvimbo dzinoshandiswa, zvikanganiso zvikuru (semuenzaniso, nzvimbo dzakachekwa), uye nzira dzinoshandisa mvura dzinodzora kutenderera kwenyika.
GNSS, InSAR, uye Geodesy: Kuyera Kushanduka Kwesimba
Kunyange zvazvo nzira dziri pamusoro dzinoti "ona" maumbirwo, geodesy "inoona" kufamba kwadzo. GNSS (geodetic GPS) inoyera kutama kwenzvimbo dzepamusoro ne millimeter kusvika pa centimeter chaiyo, nepo InSAR (Interferometric Synthetic Aperture Radar) ichiongorora kutama kwenzvimbo kubva mumifananidzo yesatellite. Zvese zvakakosha pakuona zvikanganiso zvinoshanda, mwero wekutsvedza, kuunganidzwa kwesimba, uye kutama kwenzvimbo mushure mekudengenyeka kwenyika.
NeInSAR, maitiro enzvimbo dzakatenderedza makomo kana makomo anoputika anogona kutsanangurwa senzvimbo dzinokonzera shanduko pasi pevhu. Kubatanidza geodesy ne seismology kunopa mufananidzo wakakwana wedenderedzwa rekudengenyeka kwenyika: kukiya, kusunungura, uye kugadzirisa.
Kubatanidza uye Kududzira Mafambiro Ebasa
Kuzivikanwa kwezvimiro zve tectonic zvakasimba kunoitwa kuburikidza nekubatanidzwa kwenzira dzakawanda. Kuyerera kwakazara kunosanganisira:
1. Kuunganidzwa kwedata rezve geology: mamepu e lithology, data rezvikanganiso, stratigraphy, uye geomorphology.
2. Kuwanikwa kwenzvimbo dzepasi pevhu (geophysical acquisition) pachinangwa: kutenderera kwenyika (seismic) kuti pave nejometri yakadzama, simba rinokwevera pasi/magnetic kuti pave nedunhu, ERT/MT kuti pave nemafuta uye nzvimbo dzisina simba.
3. Kugadzirisa nekugadzirisa: kusefa, kugadzirisa topographic, kuchinja, kutama kwekudengenyeka kwenyika, kuenda pakuparadzaniswa kwenzvimbo dzisina kunaka dzakasara.
4. Kududzirwa kwemuenzaniso unotungamirirwa: kuona kusaenderera mberi, ma gradients, uye mapatani ekuratidzira; kugadzira zvikamu zve 2D/3D; kuyedza mamiriro ezvinhu.
5. Kusimbisa: kuenzanisa nemasango, data retsime, macatalog ekudengenyeka kwenyika, kana kuyerwa kwenzvimbo.
6. Kutevedzera kwekupedzisira: mamodheru epfungwa uye ehuwandu maererano nechimiro, kudzika, uye chiitiko.
Matambudziko uye Kusava nechokwadi
Dudziro yeGeophysical inogara iine kusava nechokwadi nekuda kwehunhu husina kujairika hwekupinduka: mamodheru akawanda anogona kutsanangura data rimwe chete. Zvimwe zvinhu zvinosanganisira ruzha, kuvharwa kwenzira shoma, kusiyana kwematombo, uye mhedzisiro yenzvimbo. Nokudaro, zvakakosha kutaura mhinduro dzakasiyana-siyana (pane nhamba imwe chete), kushandisa zvirambidzo zvegeological, uye kuita ongororo yekunzwisisa.
Penutup
Geophysics inopa nzira dzakasimba dzekuziva maumbirwo etectonic, akavanzika uye anofamba-famba. Seismic inotarisa geometry yezvikamu nezvikanganiso zvine resolution yepamusoro; gravity nemagineti zvinoratidza density uye magnetic contrast pa regional scale; electrical/EM methods dzinoratidza fluid zones uye rock weakness; uye geodesy inotarisa deformation chaiyo painoitika. Yakabatanidzwa nokungwarira, nzira idzi hadzingobatsiri chete kunzwisisa tectonic evolution asiwo dzinotsigira kuderedza njodzi dzekudengenyeka kwenyika, kutonga kwepasi pevhu, uye kutsvaga zviwanikwa zvakachengeteka uye zvinobudirira.
Kana muchida, ndinogona kugadzirisa chinyorwa ichi kuti chienderane nemamiriro ezvinhu echiIndonesia (semuenzaniso Java–Sumatra subduction zone, Sumatra Fault, Palu-Koro) kana kuchinja maitiro ekunyora kuita fomati yejenari resainzi ine zvirevo.
