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PETROVIETNAM NGHIEN CCrU OAC DIEM D\A HOA BE PHU K H A N H ThS Nguyen Thj Tuyet Lan, TS Nguyen Thu Huyen, ThS Nguyen Thj Thanh ThS Le Hoai Nga, KS Ho Thj Thinh, KS Phi Ngoc Oong Vien Dau khi Viet Nam[.]
PETROVIETNAM NGHIEN CCrU OAC DIEM D\A HOA BE PHU K H A N H ThS Nguyen Thj Tuyet Lan, TS Nguyen Thu Huyen, ThS Nguyen Thj Thanh ThS Le Hoai Nga, KS Ho Thj Thinh, KS Phi Ngoc Oong Vien Dau Viet Nam Tdm t i t NhCrng ndm trvtdc day, viic nghien cvTu khu vi/c nvfdc sau tgi be tram tich Phu Khdnh cdn rat hgn che c giing khoan ndo dtfdc thuc hiin Viec phdt hien ddu dd chUa carbonate Miocen tgi gieng khoan 124CMT-IX c y nghia rdt Idn ddi vdi cong tdc tim kiem, tham dd ddu khidkhu vUc ndy Id mot minh chUng cho nhdn dinh ve tiem ndng ddu cua khu vUc bi Phu Khdnh Trong bai bdo ndy, nhdm tdc gid nghien cUu sU tdn tgi cdc tang dd me, mdi lien hi sdn pham ddu tho vd dd me tgi khu vUc bi Phu Khdnh; du bdo tiim ndng, lich sCrsinh, di cU cda ddu cdc tap dd me tdi cdc tang chUa/cdu triic vd sU tdn tgi c6a chung Gidi thi#u Chung ve be Phu Khanh Bl Phu Khinh tiep giip vdi vung bd bien mien Trung cua Vi§t Nam, k6o d i i tii Quing Ngai den Phan Thiet Be Phu Khinh gidi han tii vT dp 10°30 -15°30 Bic v i kinh dp tii 109° - 112''30 Odng vdi dl?n tfch khoing 200.000kml Oiy l i vung nudc siu, cd dja hinh diy bien thay doi nhanh tii Om den tr^n 4.000m (Hinh 1) Cich bd bien khoing 50 - 70km, dja hinh diy biln tUOng ddi bing phing cd d0 ddc khdng Idn; ti^p dd l i khu vUc sUdn ddc cua them luc dja, muc nudc biln Idn hon 200m va dp ddc Idn den 1.000m v i xa hon l i 3.500m nUdc [1,2] trim tfch manh giUa cic khu vUc, die biet l i giiJfa phin phfa Bic va phfa Nam, giUa phin phfa Odng v i phfa Tiy Be day trim ti'ch Kainozoi diy nhat d khu vUc phfa Odng (cd the tdi hon 10.000m), mdng din d khu vUc phfa Tiy v i Nam eiia khu vUc nghien cufu Hien d be Phu Khinh mdi chi cd gieng khoan thim dd, dd chi cd gieng khoan tdi mdng Do dd, dia ting trim tfch cua vung nghien cUu dupc xiy dung chu yeu dua vio nhUng phin tfch ngoai suy tU nhieu ngudn t i i lieu, dac biet l i nhUng lit cit cua cic gieng khoan da dupc tien hinh tai cic vung lin cin Ben canh dd, ket qui phin tfch dja chin - dja ting, tii va trpng lUe cung dupe ket hpp va sCf dung mdt cich Nim d khu VUC them luc dja miin Trung Vidt Nam, phia Nam ti^p giip vdi phin Odng Bic b^ Cufu Long v i Nam Cdn Son, phfa Bic tiep giip vdi phin Nam be Sdng Hong Phfa Tiy la vCing sUdn them luc dja chuyen dot ngdt sang cic viJng sut bic siu d phfa Odng Phin Idn dien tich cua be cd dd siu nudc bien tren 200m, vi viy cic hoat ddng tim kiem, t h i m dd cdn it dupc trien khai nghien cUu Hien chi cd gieng khoan tham dd tren khu vUc niy (Hinh 2) [2] Net chung nhit cua dja t i n g trim tfch bi Phii Khinh l i cd sU bien doi nham tudng Hlnh Be Phu Khdnh vd sa dia hinh ddy bien khu vuc be Phu Khdnh (VPI, 201 THAM DO - KHAI THAC D A U KHI cd hi§u qui qua trinh lap dia ting cCia vung nghien cufu (Hinh 2) [2] Trim tfch Kainozoi d phin phfa Bic mang nhufng net die trUng cho tudng trim tfch bien l i chCi yeu va cd nhieu nit tuong ddng vdi nhCfng tao trim tfch da dUpc phit hien, nghien cufu tai phin Nam be Sdng Hong (die bi&t l i trung Hue - Quing Ngii va dja luy Tri Tdn) Trong dd, d phin phfa Nam cic trim tich dupc thinh tao chu y^u dieu kien tam giic chiu xen ke bien, bien ndng v i cd nhieu n^t tuong ddng vdi trim tfch phin bd d ria Odng Bic cCia be Cufu Long (Ld 01,02,15-1 va 15-2) v i phin cue Bic cua be Nam Cdn Son (Ld 03 v i 04) Die diem 2mg/g (2 - 29,1 mg/g), Kerogen chu yeu hdn hpp loai v i (gii trj HI: 60 - 625mg HC/gTOC) cho tiem nang sinh hon hpp diu, khf (Hinh 3a va 3b) [4] Trim tich Miocen dUdi: Mau set ket Miocen dudi cd dp giiu vat chit hufu co dat trung binh, tiem nang sinh ngheo, chufa chu yeu Kerogen loai III Rieng ddi vdi mau s4t than/than, dp giiu vit chit hufu co tii tot - rit tot, Kerogen chu yeu loai III cho sin pham khf chCi yeu [4] Oi me niy mdi chi bUdc vio ngudng trudng thinh tai phan day cua tip, tai phin phfa tren chUa vio ngUdng Khu VUc phfa Nam be Phu Khanh (tiep giip Odng Bic be Nam Cdn Son) hiu nhU 6a me bit d i u vio ranh gidi chdm trUdng thinh, dp siu khoing tii 3.200m trd xudng, vao pha cCfa s6 tao d i u dudi 3.800m Vdi khu vUc Nam Sdng Hdng, cic gieng khoan Ld 119,120,121, mdi chi khoan den trim tfch tuoi Miocen giOfa (trU gieng n9-CH-lX) dupc phin bd vCing 6a me chUa trUdng thinh O i me Oligocen chi b i t gap tai cic gieng khoan Ld 118, dupc phin bd glQa ranh gidi chdm trUdng thinh den trudng (sd lieu phin tich miu bio tCf phin hoa) Tai gieng khoan 124-CMT-lX, tren g i i tri nhi§t dd tai gi^ng khoan, d i me budc v i o ranh gidi chdm trudng thinh dp siu khoing ~ 2.200m Hinh Cdt dia tang tong hap biPhu Khdnh Tren bieu dd phin bd %TOC&HI (Hlnh 4a), phin Idn lupng mau cd xu the phin bd chu y^u PETROVIETNAM n m1« ]Tn> TTM lia m/° / T / ^ n jjm ^ : i ^g 300 ° f# / l i -|M— i" : lliilll ^ ^ Q trn "^ M^ «j ^r^ ^0 o^x- + ' '- ^^1KwV I (Cuasai Ijjlr ' ml' (4nigii:cui){{ T i n g h i m \wfng Ctrbou hmi w - T O C (%) )l w ° M tffl [\\\ Hinh 4a Bieu quan hi TOC-HI W'-9 i^ o' ^ • -' HJnh 3a B/^utf(5tiim ndng sinh hydrocarbon tram tich be Phu Khdnh vd vung Idn cdn ^ H Miocen giCJra • • i Miocen dUdi Lo^n ^ H Oligocen 750 Đã 600 Lo^iZ Hinh 4b Bieu moi quan hi C^-C^^-C^^ Sterane, i^ f 450 X 300 150, -% Tai gieng khoan 124-CMT-lX da phat hien d i u da chUa carbonate, cd ham lUpng luu huynh rat thap (%S: 0,043Wt) thupc loai dau ngpt, nhe ("API: 36,83) T^ sd Ts/(Ts -I- Tm): 0,4 - 0,44 (tUOng dUOng gia trj %Ro ~ 0,95), dieu khIng djnh day la dau trUdng [3,13] Tren d i i phan bd sic ky no CIS*, dang phan bd yen ngua tU C„-C35, tfnh trdi C^j-C^^ v i C^^-C^^ the hien sU pha trdn ngudn vat lieu luc dja v i it d i m (Hlnh 5a) [3] SU v i n g mat cau ttf C^^-Gammacerane chi sU i n h hudng rat it cua mdi trUdng nUde man Oac biet, sU xuat hien cau tCf »(°C) 4a-methyl-24-ethyleholestanes, nhu mdt chat chi thi Hlnh 3b Biiu d6 phdn logi vdt chdt hOu ca tram tich be Phu Khanh danh dau mdi trudng dam hd nude ngpt [4,12,13] Ndng dp C33-4 methyl steranes mau dau cao (S8 = 119,47) vd viing Idn cdn (pie42)(Hlnh5bva5e) vung 6it me ngudn gde luc dja va hdn hpp dam hd tam giic chiu, ling dpng mdi trudng oxy hda thap DUa tren sd lieu p h i n tfch GC, GCMS-MS tren cd the (phin Idn miu di cd ty sd Pris/Phy > 3) Bieu tam giac thay ring dau tai gieng khoan 124-CMT-lX the hien cd Cj^-Cjg-Cj, Sterane, phan Idn cic mau d i tap trung chu yeu sU ddng gdp ty phan cua ngudn vat lieu hUu co dam hd vung cufa sdng - tam giic chiu (luc dia) (Hinh 4b) [4] Chung dupc d i n h gia cd k h i nang sinh tU da me ehUa LoAli oAuu 15 THAIVI D O - KHAI THAC DAU KHJ ngudn vit lieu hufu co hon hpp luc dja (thuc vat bic cao) v i dam hd (tio) (Hlnh 5d) Tren ket qui phin tich mau tram tich Oe tam khu vUc lin can (Nam Sdng Hdng, Bic Nam Cdn Son), cd sUtdn tai cua t i p da me tudi Oligocen va Miocen sdm Oi me cua be tren deu chda vat chat hUu co ngudn gdc dam hd va luc dja vdi cac ty le khic Oieu cijng dupe ehUng minh bing cic phat hien dau tai 04-3-BC-1X, 04-2-NB-1X, 119-CH-1X cho thay tdn tai nhdm hp diu: dim hd, luc diaW, 12,13] Sd lieu phan tfch mau dau.tai 124-CMT-1X v i ket qui phin tfch dja hda vung Ian can be Phu Khinh dU doan cho thay: be Phu Khinh cung cd d i me Oligocen v i Miocen dudi chUa vat chat hUu co ngudn luc dja v i dam hd Ngoii ra, khdng loai trU nang cd mat d i me ehUa ngudn vat lieu bien khu vue nudc sau ngoii khoi (vung nUde siu > 3.500m) phan phia Odng cua be, khu vUc rit ddc vi tudng tram tfch thay ddi rit nhanh [2] Ket qua thdng ke md hinh dja hda cho thay, mUc dd trudng thinh tai diy t i p d i me Oligocen, phan Idn d i me phat trien hudng Odng Bic - Tiy Nam gidi han Ld 146 v i 126 v i md rdng Sample natneOSTB, phan phfa Odng khu vUc Ld 123, hi^n pha tao khd Dii keo dii tif Ld 120,119,118va phin Ld 117 (phia Tiy ddi nang Tri Tdn) dang pha tao khf am v i condensate (Hinh 6a) a jkLk Hinh 5a Ddi phdn bo C^^ hydrocarbon no mdu dau tgi 124-CMT- IX • 'U-.-.-iAu^^w-i ' ^^"^-*^'^^ h 5b Ddi phan bo Sterane (m/z 217), mdu dau tgi 124-CMT- IX a m M r t H h H a i Ml aiW6iL.LiO 5d Biiu dd Oleanane/CJiopane thudc be trdm tich d Viit Nam vd tyso (Ts/Tm) cdc mau ddu Hlnh 6a Bdn dd trudng thdnh day tang Oligocen trpng viec d i n h gia trien v o n g c u n g n h u t i e m nang d i u khf cua vung n g h i e n cufu Tren Hlnh 7a va 7b t h e hien tdng m i t dd di t h o i t sin pham hydrocarbon tU d i me hieu dgng Oligocen Mat dp di t h o i t t i p trung cao tai khu vuc da m e trung t i m bi (trung s i u Ld 123,146,147) Hinh 6c Bdn trudng thdnh ndc tang Miocen va xuat hien di cU c h u y e u t h d i ky M i o c e n giUa ( k h o i n g D i u , khf dupe sinh b i t d i u v i o thdi ky Miocen 16 t r i e u n a m trUdc) Hien tai da m e d a n g t r o n g pha k h i sdm ( k h o i n g 24 trieu n i m trUdc) v i o pha sinh m a n h m e t r o n g cac dia h a o / b a n dia hao, p h a n b d k h u vUe phia 17 THAM DO - KHAI THAC o A u KHI Hinh 7a Sado phdn bo tSng mat ddu sinh tang ddme Oligocen Hinh 7b Sado phdn bo tong mdt dau sinh tang dd me Miocen duS Hinh 8a Do bdo hda hydrocarbon cua mat cdt AB tgi thdi diem hiin tgi Hinh 8b Do bdo hda cua mdt cdtAB tgi thdi diem hiin tai ngoii chin sUdn luc dja (trung t i m be).Trong dd, tai khu VUC ndng hon d i me dang pha sinh dau - am Ket q u i md phdng dp bio hda diu, thdi diem hien tai cho thay da xuit hien nhUng vung cd dp bio hda hydrocarbon tuong ddi cao, cd bieu hien di cU manh cua diu, khf len tang tren (Hinh 8a - d) Lupng hydrocarbon chi di thoit tC/ting d i me d i me dat den pha cCfa sd tao d i u (pic) VI viy, thdi gian di CU dau va lien quan den lupng diu sinh manh me tU da me [5] Tai diy ting da me Oligocen, hydrocarbon bat dau di cU Miocen sdm tai khu vUc trung siu v i cho tdi thdi diem hien tai vdi khu vUc ndng hOn vdi sU c6 mat d i me.Trong dd tai ndc d i me nay, hydrocarbon bat dau di cu thdi ky Miocen trung trd lai diy (Hinh 9a v i 9b) PETROVIETNAM Hinh 8c D6 bdo hda cua mdt cdt CD d thdi diem hien tai Hinh 8d Do bdo hoa cua mat cdt CD thai diem hien tgi \ Nlia traiifi » « M^3 ^ i « Hinh 9a Sa dd thdi gian di cUtai ddy tdp ddme Oligocen , Hinh 9b So thdi gian di cu tgi ndc tdp ddme Oligocen 3.K£tlu$n cung cap sin pham de nap bay Theo nhu k^t q u i nghien cufu dia hda cung nhU ket q u i md hinh, khu vUc niy tdn tai tap d i me: Oligocen, Miocen dUdi Trong khu vUc nghien eUu, tdn tai ho dau: Hp dam hd (lacustrine) va luc dja (fluvio-deltaic) O i me Oligocen phan bd d nhufng trung sau (dia hio, bin dja hio), q u i trinh hydrocarbon di cU xiy dien rdng, xiy giai doan: giai doan khoing 16-21 trieu nim; giai doan tC/ -11 trieu nam trUdc Tai vung nUdc ndng (khoi ning), hiu nhU ving mat trim tich Oligocen hoic cd the cd chieu day tram tfch rat mdng, ddng gdp khdng ding ke tiem ning sinh hydrocarbon O i me Miocen dUdi bit d i u sinh khoing trieu n i m trudc tai trung siu, hi§n dang qui trinh Dua vao thdi gian sinh, di cU cua sin pham hydrocarbon, viec nghien cUu thdi gian hinh bay/ cau tao rat quan trong cdng tic tim kiem Can nghien eUu them anh hudng cua hoat ddng nui Ida tre tdi qua trinh sinh va tich tu dau khf vung nghien cufu Tai lieu tham khio Nguyen Hiep Dia chdt va Tai nguyen Dau Viet Nam Nha xuat ban Khoa hpc va Ky thuit /2007.550 trang Nguyen Manh Hung Nghien c(tu cau true dia chat oAUKMi SO 3/2013 19 THAM DO - KHAI THAC DAU KH[ va tiem nang dau be Phu Khanh tren ca sd tai lieu dia chdt, dia vdtly 2011 Luu trU tai Vien Diu Viet Nam and petrology in petroleum exploration - Basic organic sedimentology and introduction to the use of organic geochemical screening tools and biological marker Plain Geological final well report of 124-CMT- IXand technique 2002 124-HT- IX LUU trCf tai Vien Dau Viet Nam 2007 10 Nguyen Huy Quy va nnk Nghien ci^u cau true dia Douglas Waples A manual for source rock chdt va dia dong li/e Idm casd ddnh gia tiem nang ddu khid evaluation using petroleum systems concepts 1997 cdc vung bien sau va xa bd cua Viet Nam Bio cio tong ket Douglas Waples A manual for source rock Oe tai KC-09-06-2005 LUu truf tai Vien Dau khf Viet Nam evaluation using petroleum systems concepts 1997: 11 Akihiko Okui, 2011 Geochemical analyses result R 54 - 60 on oil seep samples Douglas Walpes T7me and temperature in 12 A.Okui, Y.Yokoyama, K.Yokoi Higher-plant petroleum formation application of Lopatin's method to biomarkers in Oilsfrom Southeast Asia Res Org Geochem petroleum exploration of "The American Association of 1998; 13: p 5-12 Petroleum geologists" Bulletin 6/1980; 64(6): p 916 - 926 13 K.E.Peters, C.C.Walters, J.M.Moldow/an The ENRECA project Integrated analysis and modelling biomarker guide: Biomarkers and isotopes in petroleum of geological basins in Vietnam and an assessment of their systems and earth history Cambridge University 2005; hydrocarbon potential - First phase: Phu Khanh basin Bao 700 cao tong ket pha l.LUutrUtaiVien Diu Viet Nam 14 Trjnh Xuin Cudng va nnk Xay dUng chuong trliA Hoing Olnh Tien, Nguyen Thuy Quynh Dac diem ke hogch khao sat dieu tra tai nguyen dau vung biinM dia hda cdc be tram tich thim luc dia Viit Nam Tap chf Dau them luc dia Viet Nam giai dogn 2009 - 2015, dinh /it#^ sd 7/2003 den 2025 2009 LUu trU tai Vien Dau khf Viet Nam Jorgen A Bojesen Koefoed Organic geochemistry A study of the geochemical characteristics of Phu Khanh basin Nguyen Thi Tuyet Lan, Nguyen Thu Huyen, Nguyen Thi Thanh Le Hoai Nga, Ho Thi Thanh, Phi Ngoc Dong Vietnam Petroleum Institute Summary Studies of the deep water part of Phu Khanh basin were previously limited because no drilling activities had been carried out at the time However, the discovery of oil in Miocene carbonate reservoir at 124 CMT-1X well in 2008 has encouraged oil and gas exploration activities as it proves the basin's petroleum potential In this article, the authors studied the presence of source rocks and the relationship between crude oil and source rocks in Phu Khanh basin, and forecasted the petroleum potential, the history ofHC generation and migration from source rocks to reservoirs or structures as well as the existence of petroleum accumulations 20 Bitoral-SO 3/2013