Tap chiKHKTMo Bia chdt, sd29, 0112010, tr 1 5 DAU KHI (trang 1 5) MO HINH XAC DINH DO THAM THEO DON VI DONG CHAY CHO HE TANG SAN P H A M T U O I MIOXEN HA, MO BACH H 6 LE HAI AN, Trudng Dgi hgc Md Dia[.]
Tap chiKHKTMo - Bia chdt, sd29, 0112010, tr.1-5 DAU KHI (trang 1-5) MO HINH XAC DINH DO THAM THEO DON VI DONG CHAY CHO HE TANG SAN P H A M T U O I MIOXEN HA, MO BACH H LE HAI AN, Trudng Dgi hgc Md - Dia chdt NGUYEN XUAN TRUNG, Tong Cdng ty Thdm dd vd Khai thdc Ddu Tom tat: Di xdy dimg md hinh dia chdt md, viec xdc dinh cdc do'n vi ddng chay di liin vdi tuang trdm tich vd xdy dung quan hi dp rdng - dp thdm ciia chimg ddng mpt vai trd quan trgng Tdc gid bdi bdo trinh bay nhimg kit qud nghien cim ban ddu cho md hinh tinh todn dp thdm theo cdc don vi ddng chdy xdc dinh dugc tich hop tdi lieu dia chdt - dia vdt ly hi tdng sdn phdm tudi Mioxen hg, md Bgch Hd, bi trdm tich Ciru Long a thim luc dia Viet Nam Md hinh dp thdm dua tren phdn logi tdng chua thdnh don vi ddng chdy la khd tdt di phuc vu md hinh hda tdng chira vd tinh todn dp thdm, vdi hi so tirong quan ciia dp thdm tinh theo md hinh so vdi dp thdm ghi trin mdu loi Id E:=0,885 Ca sd ly thuyet ve don vi ddng chay dugc Ebanks dua tir cudi nhung nam 80 [7] Trong nhQng nam gan day, ly thuyet ve don vj ddng chay dugc cac nha khoa hgc cua trudng Dai hgc Heriot-Watt, Vuong qude Anh tiep tuc phat trien va dua vao ung dung ITnh vuc dau khdng chi de du bao tham tii' tai lieu dja vat ly gieng khoan (DVLGK) ma cdn de lua chgn sd lugng mau Idi tru tdi thieu can thiet phai phan tich cac tham sd tang chua dac biet (special core analysis), phuc vu cho du bao nhieu tham sd dja vat ly va dja hda khac tir tai lieu DLVGK, xay dung md hinh ddng cua tang chii'a dat nhieu ket qua kha quan, chung td tinh khoa hgc va thuc tien cua ly thuyet ve doTi vi ddngehay[l,3, 4, 5, 6, 8, 9] Trong sudt qua trinh tim kiem tham dd va khai thac dau d md Bach Hd thudc quan ly ciia lien doanh dau VietsovPetro tir 1981 den nay, ddi tugng khai thac chinh la than dau da mdng granit niit ne Tuy nhien, cdng tac phat trien md tai thdi diem hien tai, ngoai ddi tugng da mdng nut ne, cac than dau tram tich tudi Mioxen va tram tich tudi Oligoxen dang dugc cac nha nghien cuu bat dau tap trung danh gia lai de nang cao he sd thu hdi dSu Day cung la mot dinh hudng chung cho tat ca cac cdng ty dau dang boat ddng tai Viet Nam De nghien ciru va danh gia Iai tiem nang dau tram tich Mioxen ha, ngoai cac phuang phap tiep can thdng thudng da dugc tien hanh nhieu nam qua, viec ap dung mot phuong phap tiep can mdi la phan tich tdng hgp tai lieu DVLGK va tai lieu mau loi vdi muc dich phan chia via chiia dau cac dan vi ddng chay de xac dinh cac quan he rdng va tham cua via chu'a, se cho phep xay dung md hinh tham va xac djnh cac dac diem dja chat - dia vat ly lien quan den ddng chay cua cac tang chiia dau tudi Mioxen la thuc su can thiet Khai niem don vi dong chay va cac phu-ong phap xac djnh Tir cudi thap nien 80 cua the ky XX, Ebank da dua khai niem don vi ddng chay hay don vi thuy lire [7] Amaefule va nnk (1993) \h\ 6k\x tien dua cac khai niem ve chi sd chat lugng via chira (RQI), chi sd viing chay (FZI) thdng thoang cua via chira (O^) va chi rang, mdi quan he tham - rdng theo phuang trinh hdi quy tren dd thj ban logarit la khdng chat che va da dua mot phuong phap xac dinh quan he tham - rdng thiet lap tren ca sd dac tinh thiiy lire cua dat da phu thudc vao kien true hinh hgc cua lo rong [4] Y nghTa dja chat cua tham sd FZI va phuang phap phan nhdm cac mau loi theo gia tri FZI dl xac djnh cac doTi vi ddng chay dugc trinh bay chi tiet [1] Cd nhieu phuang phap khac de xac dinh cac dan vj ddng chay, chu yeu dua tren tai lieu ghi tham, rdng va cac tham sd khac tren mau Idi Nhieu each tiep can khac da dugc cac nha nghien cuu iing dung de xac djnh dan vi ddng chay dua tren quan he giua rdng va tham, bao gdm cac phuang phap hga sir dung thj true giao giua RQI va Oz, ve bieu tan suat tich luy cua FZI, ve bieu dd phan bd cua FZI va phuong phap phan tich thdng ke md ta sir dung thuat toan Ward, phuang phap R35 sir dung phuong trinh Windland Cac phuong phap deu cd chung muc dich la phan chia cac mSu cac nhdm khac nhau, dua tren cac quan he cua cac tham sd dugc xay dung tren ca sd ly thuyet ve don vj ddng chay [3] Hau het cac tiep can sir dung thi va sd cac nhdm mau phu thuge nhieu vao ngudi phan tich dd thj, vay ma sd lugng nhdm mau cung nhu ranh gidi giua cac nhdm khdng chac chan va tin cay thap Phuong phap phan tich nhdm dua tren thuat toan Ward [2] la phuoTig phap tiep can khdng sir dung thi de xac djnh sd cac nhdm mau dugc nhdm tac gia su dung nghien ciru Ca sd cua phuang phap la tat ca cac mau dugc nhdm lai tuan tu vdi nhau, cho den dat dugc sd nhdm cSn thilt Sd lugng ciia cac nhdm la mot tham sd dau vao ciia thuat toan De xac djnh sd lugng ciia dan vj ddng chay, phuang phap bieu tan suat tich luy dugc ket hgp ciing vdi phuong phap thdng ke sir dung thuat toan Ward Mot nhung uu diem cua thuat toan Ward la su phan tan ciia cac mau cac nhdm dugc giam tdi da Chinh vi vay ma thuat toan Ward dugc chgn dl U'ng dung nghien cuu de xac djnh cac don vi ddng chay Tuy nhien, nhu da trinh bay d tren, sd lug'ng ciia cac dan vj ddng chay (so nhdm) lai la mot tham sd dau vao cua phep phan tich nhdm Trong nghien ciru nay, sd dan vj ddng chay dugc thay ddi tir den de tinh toan nhay ciia md hinh tham Mo hinh tham theo don vj dong chay cho he tang san pham tuoi Mioxen ha, mo Bach H6 2.L Xdc dinh don vj dong chdy Ca sd lieu va kit qua sa bg xac djnh don vj ddng chay cho tang san ph^m X dugc trinh bay [2] Trong nghien cu'u nay, ddi tugTig nghien ciru dugc md rdng hoTi cho toan bd he tang san pham tudi Mioxen Muc dinh chinh cua nghien ciru la xay dung md hinh tinh toan tham cd tin cay cao phuc vu cho md hinh hda tang chua Hinh cho thay quan he tham - rdng cho he tang san pham Mioxen cd he sd tuong quan hdi quy rat thap, chi dat dugc R"=0,473 Nhu vay, neu chi su' dung mot quan he rdng - tham cho toan bd he tang san pham thi tin cay khdng cao Chinh vi vay, viec tim quan he rdng - tham chinh xac cho tiing doTi vj ciia he tang hoac khoang sau la thuc sir can thiet, viec ap dung md hinh tham theo tiing doTi vi ddng chay mang lai hieu qua cao hon [2] : • t^iiRW' • ' ã ã i