Tuygn tap bao cao Hoi nghj KHCN "30 nam Phu khi Viet Nam Ca hoi mdi, thach thuc mdi" 5 6 1 DAC DIEM DIA HOA CUA DAU NHE/CONDENSAT 6 LO 12W • • • BE TRAM TICH NAM CON SON Phan Van Thang Viin Ddu Khi TO[.]
Tuygn tap bao cao Hoi nghj KHCN "30 nam Phu Viet Nam: Ca hoi mdi, thach thuc mdi" 561 D A C D I E M DIA HOA CUA DAU N H E / C O N D E N S A T LO 12W • • • BE T R A M TICH N A M C O N SON Phan Van Thang Viin Ddu Khi TOM TAT Viec thdm dd khai thde ddu & Viet Nam da dugc tiin hdnh tu khd lau vd ndi din ddu thd Viet Nam ngu&i ta thu&ng liin tu&ng den ddu thd ndng khai thac & bdn trung Ciru Long tir cdc md Bgch Hd, Rgng Ddng, Su Tu Den, Ruby, v.v Tuy vdy, qud trinh tim kiim thdm dd ddu & bdn trung Nam Cdn Son ngodi tim thdy dugc ngir&i ta cdn phdt hiin ede logi ddu khdc nhu: condensat, ddu thd nhe, ddu thd ndng, v.v Trong khudn khd bdi bdo ndy chung tdi mudn trinh bdy nhirng ddc diim dia hda ciia cdc mdu ddu nhe/condensat dugc phdt hiin & Id 12W Cdng ty Ddu Canadian Petroleum thu thdp tu giing khoan 12W-HA-IX thudc be trdm tieh Nam Cdn Son Cdc nghien ciiti dia hda dugc thuc hien v&i bon man ddu nhe/condensat khodng sdu tir 3374,5m den 3594m cho thdy rdng cdc mdu ddu ndy cd ngudn gdc chii yeu tir vdt chdt him co luc dia dugc tdch cdy hgt kin Cdc ddu vit sinh vgt tim thdy cdc ddu ndy bao gdm cdc hgp chdt no da vdng nhu: bicydlc sesquiterpanes, non-hopanoid terpanes, hdm lugng thdp hodc hdu nhu vdng mat cdc tricyclic terpanes hay sir hiin diin rdt thdp cua C24 tetracyclic terpanes vd ddc bid Id su chiim uu thi cua C29 sterane so v&i C27 vd C28 sterane Ddy Id nhirng ddu hiiu ddc trung cua cae logi ddu cd ngudn gdc tu vdt chdt hiru co luc dia Cdc n-alkane phdn bd diu tir Cl din xdp xi C30, ngodi ra, chi sd CPI xdp xi ddi v&i tdt cd cdc mdu ddu cho thdy nhirng mdu ddu ndy khd tru&ng thdnh, ty sd pristane/phytane l&n hon chirng td vdt chdt huv co sinh ddu dugc chdn viii mdi tru&ng oxy hda cao vd Id ddc diim cua mdi tru&ng trdm tich viing gdn b&, ddm lay hay cdc viing biin m& noi c& ddng gdp ddng ki cua vgt chat hiru ca luc dia DAC DIEM DIA HOA CUA CAC MAU DAU LO 12W Trong bai bao cac dii lieu dia hoa dugc khao sat tren b6n mau dau d 16 12W (MDT-1 dau nhe, MDT-2 dau nhe, DST-2 condensat, DST-3 condensat) Nhirng mau dau d trang thai long linh dong, kha nhe co trgng lugng API tir 43,64 den 50,12" nen dugc xem la dau nhe hoae condensat Ngoai ra, ham lugng paraffin kha cao d nhimg mau dau nay, ham lugng wax kha thap (0,9 - 3,2%), ham lugng luu hiiynh rit thip chi d dang vlt (< 0,1%), ham lugng kim loai nhu nickel va vanadium cung kha thip va ty s6 nickel/vanadium kha cao Nhting dac diem phan anh vat chit him co sinh nhirng diu co ngu6n g6c luc dia (R Phiip va Gilberts, 1986) [9], va cung tir cac dac dilm neu tren diu cd the dugc phan theo loai D/E (Hinh 1) Nhung phan lich chi till sau se lam ro ngu6n g6c va m6i irudng lang dong ciia vat chit huu ca tao diu Dac digm dja hoa ciia dau nhe/ condensat d 16 12\V bg tr§m tich NamCon^o^n^ 562 C28% 100 A DST-3 o MDT-1 D MDT-2 6n Lofil A a •>, fi Lo|i B,C,D,I X X X X X X —I 20 10 30 'AW 50 60 Hinh 1: Bieu tam giac bieu dien sy phan bo C27-C28-C29 sterane va Bieu quan he giua API va Pristane/Phytane ciia cac mau dau nhe/condensat 6' 16 12W Nhijng ky hieu dirge dung ctio cac bieu quan he API va Pristane/Phytane Ky hieu * A Logiddu Bien (tram tich cacbonat) X B Bien (tram ti'ch vun siHxic) + C Dam ho - D Vung chau tho, ven bien, dam lay E • D.E Khu vuc dai dien Vjnh Suez Abu Dhabi Bien Bae Trung Quoc Indonesia BSGippland Uc Vung chau tho ven bien dam lay Dau nhe/condensat 16 12W la loai D,E Tuygn tap bao cao Hoi nghi KHCN "30 nam DSu Viet Nam: Cff hoi mdi, thach thuc mdi" 563^ Sic ky long va dai phan bo gasoline cua cac cau tir hydrocarbon Kit qua phan tich sic ky long chu ylu la phan nhdm hydrocarbon d ca bdn mau diu diu thiy su chiim uu thi ciia nhdm hydrocarbon no so vdi cac nhdm cdn lai Thanh phin nhdm hydrocarbon thom va phan phan cue (NSO) co ham lugng thip, ti s6 hydrocarbon no/hydrocarbon thom la kha cao (7,63 12,30) phii hgp vdi ban chat nhe, paraffin tu nhien chua bi bien ddi cua nhOng mau dau Dai phan b6 hydrocarbon ciia nhirng mau dau cho thay sir co mat day dii cac hydrocarbon nhe vdi ham lugng kha cao, ngoai sir gi6ng ciia phan C7 d6i vdi tat ca cac mau dau chirng t6 cac dau dugc sinh tir ciing mgt ngu6n da me Chi tiet hon, dai phan b6 gasoline tren sac d6 da chi ro co sir khae dang ke phan tuong d6i cac hgp chat thom Cu the la cac mau dau n6ng (MDT-1 va DST-3) c6 chi s6 thom tuong irng 1,50 va 1,78 thap hon so vdi cac mau sau hon (MDT-2 va DST2) tuong img vdi cac gia tri 2,89 va 3,17 Ket qua sac ky ciing cho thay sir chiem uu the ciia cac hgp chat thom gia tang theo sau va phan cac n-paraffm nhe giam theo chieu sau (Hinh 2) Su thay doi ve phan cac hydrocarbon nhe co the giai thich la he qua ciia cac qua trinh bien d6i thir sinh nhu bay hoi phan doan ciia h6n hgp va dau nhe ben via [?] Sy phan bo ciia cac hydrocarbon no tren sac liy dau toan phan va phan doan C15+ hydrocarbon no Sir phan bo cac hydrocarbon no ciia cac mau dau nghien ciru tren sac d6 dau loan phan chi ro su n6i trgi ciia n-alkane so vdi cac phan lai va ham lugng 6xy hydrocarbon ciia cac mau sau cao hon so vdi cac mau nong mot lan nOa khang dinh them hien tugng phan doan di cu Ngoai ra, chi s6 CPI xap xi (Bang 1) d6i vdi tat ca cac mau dau chung t6 cac mau kha trudng Dang phan b6 ciia n-alkane tren sac ky d6 C15+ phan dgan no cua b6n mau dau kha gi6ng Hon niia ty so pristane/C17 kha cao ciing vdi ty s6 pristane/phytane tuong d6i cao (ldn hon 5) (Hinh 2) Nhung dac trung thudng gap d cac loai dau ma da me ciia chiing lang dgng m6i trudng oxy hoa nhu d cac viing gan bd, dam lay hoae cac vimg bien md vdi su g6p mat chii yeu cua vat chat hiru CO CO ngu6n g6c luc dia (Didyk et al.,1978 ) [3] Trong nhirng nam gan day, dia hoa hOu CO da phat trien nhieu phuang phap nghien cuu mdi rat huu hieu tham khai thac dau Mgt nhirng phuong phap la phuang phap sir dung sac ky ghep kh6i (GC-MS) de nghien ciiru diu vlt sinh vat ma cu the hon la cac cau tir hydrocarbon mach nhanh va mach vong ciia dau th6 va da me tir tim ngu6n g6c ciing nhu m6i trudng lang dong cua vat chat htru co sinh dau Nhtrng phan tiep theo sir dung dir lieu sac ky kh6i ph6 (GCMS) dl nghien cuu diu vet sinh vat nhtrng mau dau 564 Pac digm dja hoa ciia dau nhe/ condensat d 16 12\V bg trhm tich Nam Cdn Son Bang 1: Cac thong so dia hoa ciia dau nhe/condensat ff 16 12W be tram tich Nam Con So'n STT Thdng sd Ty API A J Wax (% Kl) Diem chay ( C) Luu huynh (% Kl) Do nhdi (Csl) MDT-1 3374,5m Gidig khoan 12W-HA-1X DST-3 MDT-2 3504m 572-3 594m DST-2 5'^ 6m 50,12 48.52 43.64 45.04 1,3 0.9 3.2 9 0,01 0,02 0.02 2,6 0,02 1333.000 1102.000 1655.000 1348.000 Saturate/Aromatic 12,3 7.63 11.33 7.56 8.8 7.61 Pristane/Phytane Prislane/nC17 6,1 7,59 1,87 2.09 1,39 Phytane/n-C18 0,22 1,91 0.22 0,23 0.18 10 Chi s6 CPI 1.00 1,05 1.06 1,03 11 H 0,57 0.6 0,59 0,57 12 H_2 0.63 0,6 0.61 0,6 13 H 0.83 0,73 0,86 0,84 14 H12 20,17 11,93 23,71 42,13 15 H12 8,67 2,53 8,92 8,09 16 17 H 15 81,52 117.63 96.91 94,1 72,84 190.39 95,79 130,45 18 H 18 H 19 107,72 11.98 184,53 103,58 19 S 0,57 0.51 0,55 0,59 20 21 S M4 0,45 86,51 0.46 87,7 0.48 85,72 0,6 81,21 CP1-0.5*((C21+C23+C25+C27)/(C20+C22+C24+C26)+(C21+C23+C25+C27)/(C22+C24+C H_l : C32 HOPANES 22S/(22S+22R) H_2 : C31 HOPANES 22S/(22S-f22R) H_3 : C30 HOPANE/(HOPANE+MORETANE) H12_l : (DE-A OLEANANE/URSANE)/C30 HOPANE ( % ) H12_l : DE-A LUPANE/C30 HOPANE ( % ) H_15 : OLEANANE/HOPANE ( %) H_18 : (Rl+R2+R3)/HOPANE ( %) H_19 : BICADINANE/HOPANE ( %) S_l : C29 STERANES aaa 20S/(20R+20S) TlT M/Z 217 S_2 : C29 STERANES a(3p 20S/(20R+20S) Tl/ M/Z 218 M4 : C30 HOPANE/{C30 HOPANE+SUM C29 STERANES) % Tuygn tap bao cao Hgi nghj KHCN "30 nam Phu Viet Nam: Cff hoi mdi, thach thuc mdi" 565 ^j oto ^ C _i I to ^ (j7-l.~ll c