Izindlela Zokuzamazama Kwe-Prestack kanye Ne-Poststack: Isisekelo Sokuhlola Okungaphansi Komhlaba
I-Pendahuluan
Izindlela zokuzamazama komhlaba zingenye yezindlela ezithandwa kakhulu nezisebenzayo ekuhloleni i-geophysical ukuze kuqondwe isakhiwo sangaphansi komhlaba soMhlaba. Lo mkhakha ubalulekile embonini kawoyela negesi, i-hydrogeology, kanye nezinye izifundo ze-geotechnical. Izindlela zokuzamazama komhlaba ngokuvamile zihlukaniswe ngezigaba ezimbili eziyinhloko: i-prestack kanye ne-poststack. Lezi zindlela ezimbili zinezindima ezihlukile kanye nezicelo ezithile ekuchazeni idatha yokuzamazama komhlaba. Lesi sihloko sizohlinzeka ngokubuka okujulile kwezindlela zokuzamazama komhlaba ze-prestack kanye ne-poststack, okuhlanganisa nezimiso zazo eziyisisekelo, izinhlelo zokusebenza, kanye nezinzuzo kanye nokungalungi.
Izimiso Eziyisisekelo Zezindlela Zokuzamazama Komhlaba
Ngaphambi kokuxoxa kabanzi ngezindlela ze-prestack kanye ne-poststack, kubalulekile ukuqonda izimiso eziyisisekelo zokubonakaliswa kwe-seismic. Le ndlela ihilela ukuthumela amaza anwebekayo emhlabeni kanye nokuqopha amaza aboniswayo (ukubonakaliswa) avela ezingqimbeni ezahlukene ngaphansi kobuso. Idatha eqoqwe kulezi zibonakaliswayo iyacutshungulwa ukuze kukhiqizwe izithombe zesakhiwo esingaphansi komhlaba.
Amagagasi Okuzamazama Komhlaba
Kunezinhlobo ezimbili eziyinhloko zamagagasi okuzamazama komhlaba: amagagasi e-P (ayinhloko) kanye namagagasi e-S (awesibili). Amagagasi e-P angamagagasi okucindezela ahamba ngokushesha futhi angahamba kokubili phakathi koketshezi kanye nolwelwesi, kuyilapho amagagasi e-S engamagagasi okuma angahamba kuphela phakathi koketshezi. Izindlela eziningi zokuzindla ngokuzamazama komhlaba zisebenzisa amagagasi e-P ukukhiqiza idatha yokuhlaziywa.
Indlela Yokuzamazama Kokuqala
Incazelo kanye nesingeniso
Indlela ye-prestack seismic ibhekisela ekucutshungulweni nasekuhlaziyweni kwedatha ye-seismic ngaphambi kokuba ihlanganiswe. Idatha eluhlaza etholakala kuzinzwa ze-seismic iqukethe ulwazi olubalulekile, kodwa futhi iyinkimbinkimbi kakhulu. Ngakho-ke, ukucubungula i-prestack kuyisinyathelo sokuqala esibalulekile ekuhlanzeni idatha ezinhlotsheni ezahlukene zomsindo (imisindo yokuduma) kanye nokubona nokulungisa ukuzindla okuningi.
Izinyathelo Zokucubungula I-Prestack
1. Ukuhlunga Nokulungisa Umsindo: Ukususa umsindo kudatha eluhlaza kuyisinyathelo sokuqala ekucubungulweni kwe-prestack. Lokhu kufaka phakathi amasu afana nezihlungi zesikhathi kanye nokususa i-convolution.
2. Ukulungiswa Okuvamile Kokuhamba (i-NMO): Uma umthombo kanye nomemukeli wegagasi kusebangeni elihlukahlukene ukusuka endaweni yokubonisa, igagasi eliqoshiwe lifika ngezikhathi ezahlukene. Ukulungiswa kwe-NMO kusetshenziselwa ukulungisa lokhu kuguquguquka kwesikhathi.
3. Ukufuduka: Le ndlela isetshenziselwa ukuhambisa ukubonakaliswa kokuzamazama komhlaba endaweni efanele ngaphansi komhlaba, ukulungisa noma yikuphi ukuphambuka okungase kwenzeke ngenxa yokwehluka kwejubane lemidiya.
Izinzuzo kanye nokungalungi kwe-Prestack Method
Okweqile:
- Inikeza idatha yokulungiswa okuphezulu ngaphambi kokufaka inqwaba, okuvumela ukuhlaziywa okuningiliziwe.
- Kwenza kube lula ukuhlonza nokususa ukuzindla okuningi, okungabangela ukuphazamiseka emphumeleni wokugcina.
Ukuntuleka:
- Inqubo ethatha isikhathi esiningi kakhulu futhi edinga ulwazi oluningi.
– Kudinga amakhono aphezulu obuchwepheshe ukuze kwenziwe ukulungisa nokuhlunga okufanele.
Indlela Yokuzamazama Kwe-Poststack
Incazelo kanye nesingeniso
Uma idatha ye-prestack isicutshunguliwe futhi yalungiswa, isinyathelo esilandelayo ukufaka idatha ukuze kuthuthukiswe isilinganiso sesiginali kuya komsindo. Izindlela ze-Poststack seismic zihilela ukuhlaziya idatha ehlanganisiwe ukuze kukhiqizwe isethi yokugcina yezithombe ezibonisa isakhiwo esingaphansi komhlaba.
Izinyathelo Zokucubungula I-Poststack
1. Ukubeka inqwaba: Le nqubo ihlanganisa yonke idatha ye-prestack elungisiwe futhi ehlungiwe ibe isithombe esisodwa. Ukubeka inqwaba kuthuthukisa isilinganiso sesiginali kuya komsindo, okwenza idatha ibe lula ukuyichaza.
2. Ukufuduka Kwe-Poststack: Lesi yisinyathelo esengeziwe sokulungisa ukuphazamiseka emiphumeleni yokubeka izinto kanye nokuhambisa ukubonakaliswa ezindaweni ezifanele.
3. Ukuhlaziywa Kwezimfanelo: Lokhu kuhlanganisa ukuhlaziywa okwengeziwe kwe-amplitude, imvamisa, kanye nesigaba ukuze kubonwe izakhiwo ezithile zokubekwa komhlaba ongaphansi komhlaba.
Izinzuzo kanye nokungalungi kwendlela ye-Poststack
Okweqile:
- Inqubo elula futhi esheshayo uma iqhathaniswa nendlela ye-prestack.
– Imiphumela kulula ukuyichaza ngoba umsindo uncishisiwe kakhulu.
Ukuntuleka:
– Ukulahleka okungenzeka kolwazi olubalulekile olunemininingwane ngenxa yenqubo yokufaka izinto eziningi.
– Ikhwalithi yedatha yokugcina incike kakhulu ekutheni idatha ye-prestack icutshungulwe kahle kangakanani.
Izicelo Embonini
Izindlela zokuzamazama komhlaba ze-Prestack kanye ne-poststack zinezinhlelo zokusebenza ezibanzi emikhakheni eyahlukene. Embonini kawoyela negesi, zombili lezi zindlela zisetshenziselwa ukuhlola insimu entsha kanye nokuhlolwa kwedamu. Izindlela zokuzamazama komhlaba ze-Prestack zivame ukusetshenziselwa ukuhlaziywa kwe-seismic inversion kanye ne-amplitude attribute, okusiza ekunqumeni izakhiwo zamatshe kanye noketshezi.
Ku-hydrogeology, izindlela zokuzamazama komhlaba zisetshenziselwa ukumaka ukwakheka kwamanzi angaphansi komhlaba nokuqonda ukusatshalaliswa kwamanzi angaphansi komhlaba. Kubunjiniyela be-geotechnical, lezi zindlela zisiza ekuhlolweni kokuqina kwemithambeka kanye nokuklama isisekelo.
Isiphetho
Izindlela zokuzamazama komhlaba ze-Prestack kanye ne-poststack ziyizingxenye ezibalulekile ekucubunguleni nasekuchazeni idatha yokuzamazama komhlaba ukuze kuhlolwe ngaphansi komhlaba. Ngenkathi izindlela zokuzamazama komhlaba zivumela ukuhlaziywa okujulile ngaphambi kokuba idatha ibekwe ndawonye, izindlela zokuzamazama komhlaba zinikeza isithombe sokugcina esiqondakala kalula. Zombili zinezinzuzo kanye nokungalungi kwazo, okwenza zihambisane nezinhlelo zokusebenza ezahlukahlukene. Ngokuqonda zombili lezi zindlela, ochwepheshe be-geophysics bangahlola ngempumelelo amathuba ahlukahlukene kanye nezinselele ezingaphansi komhlaba woMhlaba.
