Tuygn tap bao cao Hdi nghj KHCN "30 nam Dau khi Viet Nam Co'''' hdi mdi, thach thuc mdi" % 7 XAY DUNG MO HINH KHAI THAC CHO TANG DA MONG NUT NE, vi DU AP DUNG CHO MO RUBY, BE CtTU LONG Pham Thi Thiiy Con[.]
Tuygn tap bao cao Hdi nghj KHCN "30 nam Dau Viet Nam: Co' hdi mdi, thach thuc mdi" %7 XAY DUNG M O HINH KHAI THAC CHO TANG DA MONG NUT NE, vi DU AP DUNG CHO M O RUBY, BE CtTU LONG Pham Thi Thiiy Cong ty Thdm - Khai thde Ddu TOM TAT Dd mdng nut ni cd sir hiin diin cua cdc hi thdng rdng, thdm khdc Suphdn bd rdng, thdm khdng theo quy lugt nhdt dinh nhu da trdm tich md cd sir biin ddi nhanh Viec xdy dung md hinh khai thde dd mdng nut ne cdn cd cdc phuo'ng phdp riing di xdc dinh cdc thdng sd Su khdc biit xdy dung md hinh mgng lu&i cho ddi tugng dd mdng nut ne la phdi dua vdo cdc ddc diim kiin tgo, phd hiiy (dut gdy, nirt ne) Su phdn bd rdng, thdm dugc xdc dinh dua trin cdc kit qud thu dugc tir cdc giing khoan da khoan vdo ddi tugng mdng nirt ni ddng th&i kit hgp v&i cdc giai dogn hogt ddng kiin tgo cua md, khu vuc Cdc ddc diim ciia da chua: thdm pha, he sd nin, dp sudt mao ddn khdng xdc dinh true tiip tu mdu lot md dugc xdc dinh qua cdc yen td khdc theo tirng logi nut ni, hi thdng ddng chdy mdng Cdc sd lieu dp sudt thuc te (DST, MDT, PLT) dirge xem nhu la cdc yeu td chinh qud trinh xdy dung md hinh khai thde Sau ddi sdnh cdc sd lieu dp sudt vd lich sir khai thde, md hinh cd the dimg di du bdo khai thac, qudn ly md mdt cdch hgp ly Mirc tin tirdng ciia md hinh khai thde ddi tugng mdng nut ne chi mang tinh chdt tuang ddi vd dugc ndng cao cdc thdng tin qud trinh khai thde md dugc cap nhdt lien tuc GIOI THIEU D6i tugng mong nut ne la mot nhiing d6i tugng khai thac dau chinh d Viet Nam Day la mot d6i tugng tuang d6i phirc tap ve dia chat, mdi me tai Viet Nam cung nhu tren the gidi Do tinh chat kbac biet da mong ma c6ng viec xay dung m6 hinh khai thac cho d6i tugng c6 nhung diem kbac biet han so vdi xay dung m6 hinh cho cac d6i tugng tram tich Do r6ng chira cac d6i tugng tram tich la r6ng giira hat d6i tugng da mong nirt ne la cac ddi pha hiiy dap vd, cac khoang rong bien doi thir sinh da Sir phan b6 r6ng, tham vi the kh6ng theo quy luat nhat dinh nhu tram tich va kho co the diing phuong phap noi suy th6ng thudng Cac dac diem ciia da chira nhu tham pha, ap suat mao dan, he s6 nen cua da thudng dugc lay theo ket qua phan tich mau loi tram tich nhung kh6ng dai dien cho d6i tugng mong niit ne Cac dac trung thiiy lire da mong nirt ne kho xac dinh tinh chat lien th6ng giira cac kh6i khae biet nhau, phu thuoc vao cac boat dong kien tao, cac bien doi thir sinh da Do dac diem khae biet giira r6ng giira hat va rong nirt ne ma mong cd su hien dien cua hai che dong rieng biet: chk dong chinh tir cac nirt ne ldn va mot he thong dong chay cham ban tir cac vi nirt ne D6 giai quylt nhung kbac biet ciia d6i tugng mong nirt ne, mot so phuong phap da dugc ap dung dk xac dinh cac th6ng so diing cho xay dung m6 hinh khai thac cua mong 988 Xay dung md hinh khai thac cho tang da mdng niit ne, vi du ap dung cho md Ruby, bg Cuu Long^ XAY DUNG MO HINH KHAI THAC Dac di§m chung cua mong niit ne them luc dia Nam Viet Nam Da mong co phan thach hoc gom hai nh6m chinh: granit va granodiorit, thuoc cac phirc he maema xam nhap co tu6i khae nhau: phirc he Hon Khoai co m6i trudc thdi ky Triat muon (m6i myet d6i tir 188 - 253 trieu nam), phirc he Dinh Quan co tu6i Jura muon (tu6i tuyet d6i tir 108 - 178 trieu nam), va Ca Na co tu6i Creta muon (m6i myet doi tir 59 - 97 trieu nam) va co the bao g6m ca cac phuc he Hai Van (tu6i Triat muon - bae Nori), Deo Ca (tu6i Creta) Do cac hoat dong kien tao trudc va Kainozoi cac da bi pha hiiy bdi cac dirt gay, kem theo nirt ne va bi bien d6i manh me bdi cac qua trinh bien d6i thir sinh Kha nang chira dau ldn nhat nam pham vi phan b6 da granit phirc he Ca Na, mirc san pham kem hon d da granodiorit va monzonit thach anh phuc he Dinh Quan va thap nhat la da diorit va monzodiorit thach anh phirc he Hon Khoai Dudi tac dong cua cac boat dong kien tao, cac qua trinh bien d6i thir sinh, da mong hinh ba dang r6ng khae nhau: - Loai r6ng nut ne thudng d cac ddi ca nat ma dac trung la cac vi nut ne va nirt ne ldn - Loai r6ng nirt ne - hang h6c thudng hinh d dang h6c ldn, nh6 va cac 16 h6ng, cac vi nirt ne, d mirc nao chiing co sir lien th6ng vdi - Do r6ng kh6i co tinh chat chira thap va dugc coi nhu rong gitra cac tinh the rat thap dugc xep vao loai kh6ng chua Kha nang cho dong da mong chii yeu tir cac ddi nut ne ldn va mot phan nh6 tir cac ddi nirt ne nho M6 hinh khai thac cho mong nut ne dugc tien hanh theo cac bude sau: Xay dutio; mo hinh grid i Xay ditng m6 hinh ch^ luu Xay dung rn6 hinh thuy lire ban d5u Xay dung mo hinh dong chay gieng khoan i Doi sanh so lieu khai thac i Du bao khai thac i Cac phirong phap nang cao hd so ihu h6i Hinhl Tuygn tap bao cao Hgi nghj KHCN "30 nam Dau Viet Nam: Co' hgi mdi, thach thuc mdi' 989 Xay dung mo hinh mang luoi Day chinh la phan quan nhat quyet dinh tinh chinh xac cua m6 hinh khai thac mo M6 hinh mang ludi dugc xem nhu la phan khung tinh ciia m6 hinh khai thac Trong doi tugng da mong nut ne, mo hinh dia chat dugc xay dung lien quan chat che den cac dirt gay, nut ne va khe nut sinh kem tren co sd ket qua phan tich FMI va minh giai dia chan, dia chan dac biet va minh giai DST Do r6ng m6 hinh dia chat dugc xac dinh theo chieu ngang va theo chieu thang dung Theo chieu ngang cang xa dirt gay r6ng cang nh6, theo chieau thang dung noi chung r6ng giam dan tir tren xu6ng dudi Basement Fault-Driven Porosity Distribution Mcxlel Seismic Fault Plane V«rt_Por_Sc«l Max_Dist_ni ^200 - 400 m^ 02 94 CS oa 0 o: o< ^:: ^:: 09 ' Max_D_TOB^ (1800 m) Por_Scal = Vert_Por_Scal * Lat Por Seal V Hinh Phan tren gan vdi ddi nirt ne, phong boa co r6ng ldn, xu6ng sau r6ng giam rat nhanh Su bien doi r6ng theo chieu thang dung dugc xac dinh theo tai lieu dia vat ly gieng khoan Tir cac gieng da khoan timg khu vuc ciia mong co the xay dung quan he r6ng theo chieu sau cho timg gieng vao khu vuc mo hoae toan m6 IlI i )I POROSITY vs DEPTH FROM TOP OF BASEMENT • POROSITY tMnaoiao2ao3(U)4(LO5(M)6(U)7ao8ae0 ^in* NormlMd CiHflnalKrog{CoraT.Exp:1J) 09 09 08 0! 07 07 i \>„^A ^ N ^ * Joo io4 « Sôrtt*1 '" ~ " ã t \/ 1* A ^