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THAM DO KHAI T H A C D A U KHl Danh gid tinh chdt thdm chua trong thanh he da chdt xit CO tuoi Oiigocen E 6 gieng khoan GK 4X cdu tgo HS, bon trung Cuu Long, th§nn luc dja phia Nam Viet Norn TS Nguyin[.]
THAM DO - KHAI T H A C D A U KHl Danh gid tinh chdt thdm chua he da chdt xit CO tuoi Oiigocen E gieng khoan GK-4X cdu tgo HS, bon trung Cuu Long, th§nn luc dja phia Nam Viet Norn TS Nguyin Qudc QuIn TSng cdng ty Thdm dd Khai thdc Dd Tdm tit Gii'ng khoan GK-4X dUpc khoan vdo ben sttdn (flank) cda khdi ndng mdng cdu tgo HS, nhdm thdm lUOng dSukh d tdng dd mdng granite nvft ni trUdc Di tam vd tim kiim ddu d cdc trdm tich Ollgocen Ephu trtfc tiip trin mdng Cung nhu cdc thdnh he Oiigocen E khde tdng gap d bdn trQng CCfu Long, cdc thdnh tgo phd trt/c tiip lin mdng dkhu vifc gling khoan ndy dupc du dodn bao gdm cdc tdp cdt sit xen kep, trdm tich chu yiu mdi trudng d6m hd Nhung khoan qua thdnh he ndy thi kit qud cho thdy thdnh phdn trdm tich ddy khd phUc tap cd sUtrdn Idn gida cdc nhjp trdm tich, trdm tich phun trdo vd phun trdo khde Ode tinh thdm chUa cua thdnh he ndy khd kim v& 36 rong dudi 10% vd dd thdm dudi 0, ImD Tuy nhiin, kit qud thUvIa kit hap vdi kich via thuy lUc (hydraulic fracturing} dd cho dong ddu khd 6n djnh vdi lUu lugng ban 500 thung/ngdy Ddi vdi logi dd ehUa chdt xlt thi viic xde dinh cdc via ehufa ddu vd ddnh gid cdc thdng sd via se gap nhieu thdch thUe vd se khde vdi cdc tiip cdn nhu ddi vdi via trdm fI'c truyen thdng Trong bdi bdo ndy, tdc gid si md td tdm quan trong viec phdn tich vd ddnh gid ddc tinh via ehufa chdt xlt Oiigocen E d gling khoan GK-4X tren cusdphdn tieh mau sUdn mau vun tdi lieu log nhdm lUa chgn khodng via thich hctp de thuc hien thU via Gidi thieu Trong nhCfng nam g i n d l y cd hang loat phdt h i i n cIn bdng giQa phun trdo vd t r i m tieh, t i p tren vdi Uu the phan tram tieh (Hinh 2) dau d t i n g Oiigocen E thudc bdn trCing CCfu Long Thdnh h i Oiigocen E d khu vHc HS cd di&n tich khd Idn (trin 34km') nhUng chua cd gieng ndo khoan qua thdnh h i ndy trudc ddy Gilng khoan GK-4X dupe t h i l t k l vdi muc dich la tham lupng dd mdng nCft n l ben sUdn Tdy Nam cua khdi mdng n l n g HS ddng thdi tham dd dau tang Oiigocen E phCi true tiep len dd mdng (Hinh 1) Dac tinh via chiifa tang Oiigocen 2.1 Thgch hgc Theo k i t qud phan tich thdnh phan thach hpc, nhjp tram tich, tinh chat v l t ly cua da, thdnh tao t r i m tich, phun trao thi he Oiigocen E tai gieng khoan GK4X dupc chia lam tap: dudi, giOa vd tren Tap dudi vdi Uu t h i phln phun trao, t i p giUa mang tinh chat chuyen tiep cd sU I 16 DAUKH(-Sd7/2012 Hinh Mat cdt qua gling khoan GK-4X Hinh Cdtdia tdng Otigocen Edgiing khoan GK-4X oihiiail-s07/aoi2 17 I T H A M D - KHAI T H A C D A U KHI 2.3 BKuhl^nd6u Tuy nhlfin, q u i trinh khoan thi b i l u hl^n d j u kh( k h i tdt d cjc tip c i t b i t g$p t h i n h h^ Oiigocen E Hinh cho t h i y t i p c i t i) «) siu 3.410m v i 3.430m Oiigocen E cho p h i t quang c i tri/c ti^p v i giin t i l p , d6ng thdi h i m laong thinh p h i n cOng t i n g cao (gas reading peak) Rd r i n g vdi cic k i t q u i phin tich tif m i u sudn d trSn cho thiy d( t h i m cCia t h i n h h6 Oiigocen E d d t -^- r i t k6m, dUdc xem nha l i khdng g tlt W dd t i i ii|u mudiog vin i t h i y SU hi#n di^n d i u ting idy D i l u dd cho t h i y ngoii dd rdng giOa hat r i t cd t h i t h i n h h i Oiigocen E c4n Hinh Quan iie rong tham a Ihanh he Oiigocen f GK-1X cd SU hi$n di^n ciJa dd rdng khe nill Chinh cic rdng khe nijit iim tang tinh c h i t tham ehufa cho thinh h« chit xit Oiigocen niy 2.4 Olft 9dy vd nut nl Theo k i t q u i minh giii t i i Vfi FMI, c i c khe niJt cung nha ddt g i y * t h i n h hi Oiigocen E daoc t h i hiSn d Hinh Cic ddt gay nhd thudng khdng x i c dmh daoc tr^n t i i lilu dja c h i n nhang iai d l d i n g xic ^ n h da^c trSn t i i \\iu FMI qua cic d i u hifu nliif sa thay ddi hadng dd cua dja ting, g i a t i n g m i t d d n d t n l g i n d O t gay H i n g io?t cic duft gay dudc minli g i i i d khu VI/C gan dinh cCia thinil h# Hinh Mdu Idt mdng soi dUdi kinh hiin vi phdn cUc cho thdy cdc hgt tUp xiic trtfc tiip, hdu nhu khdng cd dd rong giCfa hgt Oiigocen E noi cd phuong v i gdcdfic cila p h i n idp cung thay ddi bin trfn v i dadi dot gay Ngoii ra, hing lojt 2.2 Dd rdng vd thdm cic khe nCtt cung duoc p h i t hiin vi minh g i i i doc theo t h i n h h# Oiigocen Kit qud p h l n tieh rdng t h i m cua cdc m l u sUdn d g i l n g khoan 4X cho thay dd rong rat t h i p (khoing dUdi 8%) va dd t h i m dudi 0,1 mD dUpc minh E IVlic dd h i u h i t cac khe niJt khdng iiSn tac nhang chinh mang ludi Wie hoa d Hinh Cac mau I p suit via (MDT) cung dupe thUe h i i n nhUng d l u ndt gidp cho t h i n h h i cd t h i ch^ khdng cdng thdnh h i qud chat xit K i t qud p h l n tfeh Idt mdng cung daoc d i u v i i i ngudn cung cip wU cho thIy cle hat deu tiep xuc vdi va bj bien ddi khd m^nh H l u h i t deu cho q u i trinh thuf via cung nhd kl«l khdng cd rong giCfa hat hole r l t nhd nhU Hinh i l u ndy chCfng td thdnh t h i c sau niy he Oiigocen E khd chat xit Ngay cd so sdnh vdi cdc thdnh h | Oiigocen E d cdc md khac lan can cung cho t h I y ehIt lUpng via Oligoeen E d khu vUe HSD kem hon rat nhieu 18 DAU KHl-S6 7/2012 HinhS fi /i A o o a ap at chiing to kha nang nhu'ng nu^ ne IT va co tac dgng tiLh tuL den sunang LAO tham ciia tang chifa Hinh Cac ddt gay va l^he nut duac minh giai tren tai lieu FMI Oiigocen E, GK-4X Oiigocen E la kha thach thUc Mo hinh da khoang vat (da) duoc si! dung de the hien duoc su thay doi phan thach hoc cCing nhu tinh chat dat da khung cua cac i