Kugwirizana pakati pa njira za geophysical ndi petrophysical
Pofufuza zinthu za pansi pa nthaka—kaya ma hydrocarbon, geothermal, pansi pa nthaka, kapena mchere—kumvetsetsa bwino miyala ndi madzi n’kofunika kwambiri kuti zinthu ziyende bwino. Magawo awiri omwe nthawi zambiri amapanga maziko a kutanthauzira pansi pa nthaka ndi geophysics ndi petrophysics. Geophysics imayang'ana kwambiri kuyeza momwe dziko lapansi limayankhira kuchokera pamwamba kapena m'bowo (monga mafunde a seismic , magetsi, mphamvu yokoka, ndi maginito), pomwe petrophysics imadalira kufotokozera miyala ndi madzi (porosity, permeability, saturation, density, etc.), makamaka kuchokera ku cores, zitsime, ndi mayeso a labotale. Kugwirizana pakati pa ziwirizi kumapanga mlatho wofunikira: geophysics imapereka "chithunzi chachikulu" ndipo petrophysics imapereka "chowonadi chapafupi" cholinganizidwa.
Udindo wa geophysics: kuyang'ana kapangidwe ka thupi ndi katundu pamlingo waukulu
Njira za Geophysical zimatithandiza "kuganiza" za momwe zinthu zilili pansi pa nthaka popanda kukumba zitsime zambiri. Njira yodziwika kwambiri pakufufuza za hydrocarbon ndi reflection seismicity, yomwe imawonetsa mawonekedwe a zigawo, zolakwika, ndi misampha kuchokera ku kusiyana kwa acoustic impedance. Kuwonjezera pa seismicity, njira zamagetsi (EM), geoelectrical (resistivity), mphamvu yokoka, ndi maginito zimagwiritsidwa ntchito kutanthauzira kusiyana kwa kuchuluka kwa miyala, maginito, kapena conductivity. Ubwino wa geophysics ndi malo ake ofalikira komanso kuthekera kotanthauzira kapangidwe ka madera, koma nthawi zambiri imakhala ndi kusamveka bwino: vuto limodzi la geophysical lingafotokozedwe ndi mitundu yosiyanasiyana ya geological.
Apa ndi pomwe petrophysics imayamba kugwira ntchito, chifukwa makhalidwe enieni omwe amayesedwa ndi geophysics amachokera ku makhalidwe a miyala ndi madzi omwe ali m'mabowo. Mwachitsanzo, liwiro la mafunde a seismic limakhudzidwa kwambiri ndi porosity, mineralogy, ndi mtundu wa madzi; momwemonso, resistivity imakhudzidwa ndi kuchuluka kwa madzi, mchere, ndi kulumikizana kwa mabowo.
Udindo wa petrophysics: kutanthauzira koyambira ndi chitsime ndi zitsanzo
Petrophysics imagwiritsa ntchito deta yolemba zitsime (gamma ray, density, neutron, sonic, resistivity, NMR), deta yapakati, ndi zotsatira za mayeso a kuthamanga ndi kupanga kuti apeze magawo a reservoir: porosity (ϕ), permeability (k), water saturation (Sw), shale voliyumu (Vsh), ndi rock elastic properties. Kusanthula kwa Petrophysical kumapereka chidziwitso chatsatanetsatane pamlingo wapamwamba wozungulira chitsime. Vuto lake ndilakuti deta iyi ndi yapafupi—yoyimira mfundo zinazake—zomwe zimapangitsa kuti zikhale zovuta kuifufuza mozungulira popanda thandizo la geophysics.
Kugwirizana kwa Geophysical-petrophysics kumaphatikiza ziwirizi: petrophysics imasintha momwe geophysical imayankhira, pomwe geophysics imaphatikiza ndikuwonjezera zotsatira za petrophysical kumunda wonse.
"Kutanthauzira" kwa zinthu za petrophysical kupita ku geophysical response
Ubale pakati pa magawo awiriwa ukhoza kumvedwa ngati mndandanda wa fizikisi ya miyala: sayansi yomwe imagwirizanitsa magawo a miyala (porosity, mineralogy, fluids) ndi magawo a geophysical (Vp/Vs velocity, density, acoustic impedance, shear impedance, attenuation, ndi anisotropy).
1. Chivomerezi ndi petrofizikisi
– Kusiyanitsa kwa mphamvu ya kugwedezeka kwa mafunde (AI = ρ × Vp) ndi ma acoustic impedance records.
– Petrophysics imapereka ρ (density) ndi Vp (kuchokera ku zolembera za sonic) m'chitsime, kotero kuti ma seismogram opangidwa ndi zinthu apangidwe kuti agwirizane ndi zochitika za seismic ndi zowonetsera za geological.
- Kusintha kwa AI nthawi zambiri kumagwirizana ndi kusintha kwa lithology ndi porosity; mwachitsanzo, mchenga woyera, wokhala ndi mapokoso ukhoza kukhala ndi AI yotsika kuposa shale wokhuthala. Komabe, kupezeka kwa mpweya kumatha kuchepetsa kwambiri Vp, zomwe zimapangitsa kuti pakhale zovuta za seismic (malo owala) - zomwe ziyenera kutsimikiziridwa ndi akatswiri a petrophysicists pogwiritsa ntchito zolemba za resistivity, density-neutron crossovers, kapena pressure data.
2. Kusasinthasintha/EM ndi petrofizikisi
- Njira zopewera kuwononga ndi EM zimakhudzidwa kwambiri ndi mphamvu yamagetsi ya miyala, yomwe imayendetsedwa makamaka ndi madzi ndi dongo.
– Akatswiri a za fizikisi amagwiritsa ntchito zitsanzo monga Archie (ya miyala yoyera) kapena zitsanzo za mchenga wa shaly (monga Simandoux) kuti agwirizanitse kukana kwa matabwa ndi Sw.
– Kugwirizana ndi kafukufuku wa EM (monga CSEM m'nyanja) kungathandize kusiyanitsa madera omwe ali ndi mphamvu yotsutsa chifukwa cha ma hydrocarbons ndi omwe ali ndi mphamvu yotsutsa chifukwa cha miyala yopapatiza kapena mchere, popeza deta ya petrophysical imapereka chithunzithunzi cha lithological ndi saturation.
3. Mphamvu yokoka ndi kuchulukana
- Zovuta za mphamvu yokoka zokhudzana ndi kusinthasintha kwakukulu kwa kuchulukana kwa nthaka (mabeseni a sedimentary vs. pansi pa nthaka, kulowerera, mchere).
- Zolemba za kachulukidwe ndi miyeso yapakati zimapereka kuchuluka kwa miyala, zomwe ndizofunikira kwambiri pakujambula chitsanzo cha mphamvu yokoka. Mwanjira imeneyi, petrophysics imachepetsa kutanthauzira kosiyana chifukwa cha kuchuluka kwa kugawa kwa kachulukidwe komwe kungatheke.
4. Magnetic ndi mineralogy
- Njira yamaginito kuyankha ku mphamvu ya maginito ya miyala, makamaka kuchuluka kwa mchere wa maginito monga magnetite.
– Petrophysics (kudzera mu kusanthula kwapakati, mineralogy, kapena zolemba zinazake) zingathandize kuzindikira komwe kumayambitsa zolakwika zamaginito—kaya kuchokera pansi pa nthaka, volcano, kapena zigawo zinazake—kotero kuti kutanthauzira kwa kapangidwe kake kukhale kolondola kwambiri.
Kayendedwe ka ntchito yogwirizana: kuchokera pachitsime kupita ku dera lina (kuyambira pachitsime mpaka ku chivomerezi ndi kupitirira apo)
Kugwirizana kwa geophysical ndi petrophysical nthawi zambiri kumatsatira njira iyi:
1. Kuwongolera khalidwe la deta ya chitsime: kukonza malo osungira zolemba, kufananiza kuya, ndi kusankha nthawi zosanthula.
2. Kutanthauzira kwa Petrofiziki: kudziwa mtundu wa Vsh, porosity, Sw, net-to-gross, ndi facies.
3. Kupanga chitsanzo cha fiziki ya miyala: kukhazikitsa ubale wolumikizana (Vp, Vs, ρ) ponena za ϕ, Vsh, ndi madzimadzi. Izi zitha kugwiritsa ntchito zitsanzo zamatsenga kapena zamaganizo (monga Gassmann posintha madzimadzi).
4. Chingwe cha chitsime: kupanga ma seismogram opangidwa kuchokera ku zolemba za sonic ndi density, kenako kuzilumikiza ku data ya seismic kuti zitsimikizire ubale wa nthawi yayitali.
5. Kusinthasintha kwa chivomerezi: kusintha deta ya chivomerezi kukhala zinthu monga AI kapena elastic impedance zomwe zimagwirizana mosavuta ndi zinthu za reservoir.
6. Kuneneratu za malo a m'dziwe: kugwiritsa ntchito zizindikiro za seismic, AI, kapena zotsatira za petrophysical inversion kuti ziwonetse porosity, lithology, kapena hydrocarbon probability laterally.
7. Kutsimikizira kosiyanasiyana: kuyang'ana kusinthasintha kwa zitsime zina, mayeso opanga, ndi deta yowonjezera (EM, mphamvu yokoka, geology ya pamwamba).
Ndi kuyenda kumeneku, petrophysics sikuti "imangodzaza tebulo la malo a chitsime," koma imakhala gawo lofunika kwambiri pochepetsa kusatsimikizika kwa kutanthauzira kwa geophysical.
Vuto lalikulu pakugwirizanitsa ziwirizi
Ngakhale lingaliro la mgwirizano likumveka bwino, kukhazikitsidwa kwake kuli ndi zovuta:
- Sikelo ndi kutsimikiza: Deta ya zolemba ili ndi kutsimikiza kwa masentimita-decimeter, pomwe deta ya zivomerezi ili ndi kutsimikiza kwa mamita-makumi a mamita. Mabedi opyapyala amatha "kusakanikirana" mu yankho la zivomerezi, kotero ubale wa log-seismic mwachindunji si nthawi zonse umakhala wolunjika.
– Kusakhala kwapadera: Zovuta za chivomerezi kapena ma EM zimatha kuyambitsidwa ndi zinthu zosiyanasiyana (lithology, porosity, fluids). Fiziki ya miyala ndi zowongolera za geology zimafunika kuti tisiyanitse zotsatirazi.
– Anisotropy ndi kusiyana: Malo osungiramo zinthu okhala ndi zigawo ziwiri kapena zosweka amatha kuwonetsa anisotropy yosalala, zomwe zimapangitsa kuti Vp/Vs ndi ma amplitude a seismic azidalira mbali. Izi zimafuna njira zapamwamba, monga kusanthula kwa AVO/AVA ndi azimuthal anisotropy.
– Zotsatira za dongo ndi madzi amchere: pa kukana, kusintha pang'ono kwa mchere kapena kuchuluka kwa dongo kungasinthe kwambiri kutanthauzira kwa Sw. Kulinganiza kwapakati ndi kusankha chitsanzo cha mchenga wa shaly ndikofunikira.
– Ubwino wa deta: Phokoso la chivomerezi, kusakhazikika bwino kwa zinthu, kapena zolemba zosakwanira za zitsime zimatha kuchepetsa ubwino wa mgwirizano. Popanda QC yolimba, zotsatira za kuphatikizana zingakhale zosokeretsa.
Ubwino wa ubale: kufufuza bwino ndi kupanga zisankho zodziwika bwino
Kugwirizana kwa njira za geophysical ndi petrophysical kumakhudza kwambiri zisankho zaukadaulo ndi zachuma. Pofufuza, kuphatikiza kumeneku kumathandiza kuzindikira zomwe zingatheke, kuwunika zoopsa (kuyika ndalama, thanki, kutseka), ndikusankha malo abwino obowolera. Pakukonza minda, kulumikizana kumagwiritsidwa ntchito popanga chitsanzo cha thanki yosasinthika (kugawa kwa malo ndi porosity), kupanga mapu a malo otsekemera, ndikuwongolera njira zopangira ndi zopangira.
Mu geothermal, seismic/magnetotelluric (MT) kugwirizana ndi deta ya petrophysical kungathandize kusiyanitsa madera osinthira dongo, madera osungira madzi, ndi miyala yamtengo wapatali. Mu madzi apansi panthaka , kugwirizana kwa resistivity ndi deta ya chitsime ndi mayeso opopera madzi kumathandiza kuyerekeza makulidwe a aquifer ndi khalidwe la madzi. Mu mchere, kuphatikiza deta ya mphamvu yokoka-yamaginito ndi deta ya kuchuluka/mineralojiya kuchokera ku cores kumalimbitsa kutanthauzira kwa geometry ya thupi la miyala.
Kutseka
Kugwirizana pakati pa njira za geophysical ndi petrophysical kwenikweni ndi kuyesetsa kugwirizanitsa malingaliro am'deralo ndi zoona zakomweko. Geophysics imapereka mamapu ambiri a zomangamanga ndi kusiyana kwa katundu weniweni, pomwe njira za petrophysical zimapereka magawo oyezera miyala ndi madzi kuti azitha kulinganiza ndikutsimikizira kutanthauzira. Kudzera mu fizikisi ya miyala, kulumikizana kwa zitsime, kusinthasintha, ndi kutsimikizira mobwerezabwereza, kuphatikiza kwa ziwirizi kungachepetse kusakhala kwapadera, kupititsa patsogolo kulondola kwa mapu a malo osungiramo madzi, ndikulimbitsa maziko opangira zisankho. M'dziko lovuta kwambiri la kufufuza ndi kufotokozera anthu pansi pa nthaka, mgwirizano wa geophysical-petrophysics si njira yosankha, koma chinthu chofunikira kwambiri.
