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TAP CHi Dilu KHl «5 2020 , t t ang2S 36 ISSN 2615 9902 DauKhil DAC DIEM HE THONG DAU KHI KHU W C RLA TAY NAM BE T R A M TtCH MALAY THO CHU, VIET NAM Hoang Anh Tuan'''', Trinh Xuin Ci/dng'''', Nguyen Thu Huy[.]
TAP CHi Dilu KHl «5-2020,ttang2S-36 ISSN 2615-9902 DauKhil DAC DIEM HE THONG DAU KHI KHU W C RLA TAY NAM BE TRAM TtCH MALAY - THO CHU, VIET NAM Hoang Anh Tuan', Trinh X u i n Ci/dng', Nguyen Thu Huyen' 'Tap doan Dau khiVlet Nam ^ e n Dau Viet Nam Email: tuanha03@pvn.vn T6mtSt Ket qua tim kiem tham gan day cho phat hien dau tram tfch Miocene di/di tai gieng khoan C-IX, each mo Song Boc khoang 50 km ve phia Tay B3c, da chu'ng minh hoat dgng tich cue cua he thong dau d khu vuc ria Tay Nam be tram tich Malay - Tho Chu, Viet Nam Bai bao trinh bay ket qua nghien ciru ve dac diem he thong dau khu vifc, gom cac yeu to: sinh, chiJa, chan, dich chuyen va tao bay tren co sd tong hop ket qua phan tich mau vun gieng khoan C-IX ket hgp vdi cac tai lieu dia chat - dja vat ly Ket qua nghien cilu gtSp phan lam sang to hon dac diem he thong dau vimg ria Tay Nam be tram tich Malay - Tho Chu, thuc day cong tac tim kiem, tham is khu vifc tirong lai Tif khda: He thong dau khi, da me, da chiia, da chan, ria Tay Nam, be Malay - Tho Chu Be tram tich Malay - Thd Chu nSm d phia Tay Nam Viet Nam, tr^n vung bien tiep giap giCra Viet Nam va Malaysia, co dien ti'ch khoang 100.000 km^ va du'dc lap day bdi cac tram tich De Tam co be day tren 10 km [Ij.Day la khu vUc co tiem nang dau I6n 6Dong Nam A, vcfi trCr lu'cing tai cho Udc dat ty thung dau quy doi (Todd etai., 1997) Khu VLTC nghien CLTU nam ria Tay Nam be Malay -Tho Chu, vdi dien tich xap xi 12.000 km' va sau mifc nuac bien dudi 70 m Gieng khoan C-1X la gieng khoan tham nhat tai khu vuc nghien CLTU den thdi diem hien tai (Hinh 1) Cfingtactim kiem, tham dotal be Malay-Tho Chu dugc b^t dau tir nhUng nam 70 cua the ky XX, vdi sU tham gia cua cac cong ty dau Idn tren the gidi Ket qua da co nhieu phat hien dUOc tim thay, chu yeu la phat hien va condensate [3] Gan day nhat, gieng khoan C-IX Idemitsu (Nhat Ban) thi cong da cho phat hien dau bay chCra hdn hop cau true dja tang tuoi Miocene giCfa Mac du phat hien khdng mang ti'nh thi/ang mai theo danh gia cua nha thau 12], nhang viec tim dau d gieng khoan C-IX nam tuong ddi xa cac khu vUc da cd phat hien va cac md dang khai thac (each md Song Ddc gan nhat khoang 50 km ve phia Tay Bac), cho thay tiem nang dau d khu VLTcnayvan la an so hap dan doi vdi cdng tac tim kiem, tham dd % n W n M i iOBOOlQ Ngo)'phdn biiu dM gio vo sua chua-iO/3-W4/20!0 Ngdrl)iibdoduacduyeldangm/2020 Hinh Sado vi tn khu wc nghien iifu 'V' OiUXHl Sd 5/2020 25 ] lumn luiiucUiii Oac d i i m dia chat khd Vl/c Be trim tich Malay - Thd Chu di/oc hlnh thinh tit qua trinh nut vo luc dia Sundavasuva cham git/a ming luc dia An Bp vdi mang Au • A Be nJm tren them luc dia TSy Nam Viet Nam, vdi chieu dai xap xi 500 km, chieu rang khoang 200 km vS CO phi/ong phat trien theo hi/Sng Bong BSc -Tay Nam [1,4, Sl.TUdng t u cac be tram tich kh,ic cua Viet Nam, cau true dia chat cua be gom tang chinh: Mong truac Be Tam va tram tich Be Tam phu tren mong vdi be diy dat tren 10 km [3], Phan chia chi tiet dia tang be nhu Hinh Cho den giai doan dau cua thdi ky Miocene sdm, be chiu Inh hudng ciJa moi trudng luc dia, sdng ho (aluvial - lacustrine} SU xam nhap cilia mdi trudng bien bit dau xay vao thdi ky giCta cua Miocene sdm d khu vuc trung t i m be, ria be van chiu chi phoi bdi mdi trudng sdng den dong bing chau tho (fluvial deltaic) Anh hudng cua mdi trudng bien pham vi toin be x i y vao CUOI Miocene sdm va bieu hien rd net hdn vao thdi ky Miocene giCra, ked dai sang Miocene muon cho den hien tai [3] Su ton tai cua da me nguon goc d i m hd (lacustrine) tuoi Oligocene v i da me ngudn goc than tuoi Miocene d i dupc khing dinh thdng qua nhieu gieng khoan be Oa chda duoc xic dinh la cac t i p cat ket tudi Oligocene - Miocene Cac play dau lien quan chu yeu de'n dang bay cau tao v i bay dia ting Mdt so phat hien quan ve condensate va d i u cic play da duoc ghi nhan nhu: CN-lx,KM-lX,DD-lXva NH-IX Play mdng duoc dinh gia cd tiem nang tuong dpi kem, nhien can tiep tuc ngh.en edu d l l i n , ,6 Hinh i.SudomalrvaigumtK^ kha 26 DA« uri SO S2a20 thdi gian tiep theo SUK^TI TOCIWl %) [)£PTM ' JTHO IkMi mi, (ml ; ! •• — E^ = ! = • ng cung khing dinh mdc dp chua trudng thinh nhiet cua da me d khu vac nghien edu 3.2 Dgc diem da chda Nghien edu da chda khu vuc gieng khoan C-1 X dapc thuc hien tren 22 m i u vun, vdi cac chi tieu phin tich thach hpc lit mdng (thin-section) va nhieu xa Ronghen (XRD) khoang sau 965 - 1.560 m ciing mau phin tich hien vi dien td quet (SEM) khoing sau 1.130 -1.250 m [71 Ket q u i phin tich duoc tdng hop nha 1.2.1.Phantlchthgchhgc Trong khoing siu phin tich ,dn „ ; eac loai d i khac nhu: set ket, bdt ket, cat ket v i d i vdi Kdt ouS p h i n tich thach hpc l i t mdng d i cit ket - ddi tUdnq chda chinh dapc tdng ket d Hmh 5a Cit ket CO thinh p h i n dd hat thay doi rat HmhS.-i:^.sphdnhdithxhhocoitl!eta6sAilJ00-i045m.gmigUiajnC-IX!71 : Sm6ofhdnloaaitkitgmgkh(mC'i)i{}y'.Tr,mii{ri!l7.B} (tdrS.minchodenthp,,chuyeulaloaisub-,i,b:re;e va sub-arkose, mdt vai mau I i lithic arkpse, feldspa",^ Hinh Anh phan lich thach hoc tat mdng gieng khoan C-1/17] litharenite den lithic greywacke (Hinh 5b va c); mai trdn - 7% Khoang vat nang gdm zircon va apatite Xi mang va tC/ban goc canh den ban trdn canh va trdn canh; dp chpn khoang vat thCf sinh cd mat tat ca cac mau cat ket, loc trung binh den tdt [8] vdi ham luong tir trung binh den cao Xi mang carbonate Thanh phan thach hpc chu yeu ia thach anh, vdi ham luong trung binh 40 - 50%; feldspar cd ham luong thap (2,4 - 8,6%); cac manh da: vun nui ICra (2 - 7,4%), manh granite (0,6 - 3,2%), manh da phien (0,4 - 3,6%), manh quartzite (0,2 - 1,8%) Vat lieu nen (matrix) trung binh cd mat d tat ca cac mau, gom dolomite (3,2 - 20,2%), calcite (1 - 8,4%), siderite trung binh 8% Khoang vat set thir smh gom chlorite (0,6 - 2,4%) va set khac (1,2 - 4,6%) Ngoai cdn cd su hien dien cua khoang vat khdng thau quang nhu pyrite vdi ham luong 0,6 -1,6% Diu KHf - SO 5/2020 29 lUMDfl min^CDIUQ] Hinh Anh phe- v:'- mau S£M, gieng khoan C- IX [/j Do rong nhin thay (visible porosity) quan sat tren lat mong thach hoc dUOc bao ton kha tdt (Hinh 6a - d), gom: dp rong lien thong giCfa hat (mui ten mau do) < 13,2%, dp rdng giCra cac tinh the hinh qua trinh dolomite hda (mui ten mau hong) < 6,4% va dp rdng thd sinh hda tan cac hat feldspar (mui ten mau xanh) < 1,2% E>p rong cua da chiu sU chi phoi manh me bdi sU cd mat cua cac khoang vat thd sinh (dolomite, siderite, khoang vat set) va vat lieu nen (matrix) Cac mau gan ket bai xi mang 30 Diu KHI s r ; : : : : carbonate (Hinh 6e) va ham lupng vat lieu nen cao (Hinh 6f) cd dp rong tupng ddi kem [7,9], Theo ket quS phan tich mau hi4n vi dien tCr quet (SEM), dp rong cd the quan sat rd tren i n h , gdm' dp rong lien thdng giOa hat (Hinh 7a va b), dp rdng hinh tU cac hat ket tinh (Hinh 7c) va vi I i , ' - - - r-r; ^ ^'^ongcachonq set (Hinh 7e) Cac khoang vat thir smh chu yeu gdm dolo mite, siderite, calcite, pyrite va khoang vat set {Hinh 7dl Sued mat va phat tnen cua khoann - -.^ , , J smh da • I uSKtortte Hinh B Ketqudphdn tich Ihanh phdn set gieng khoan C- tX'J] Tang gija Khoang giCfa — thiap Cdc tliSncSt khu VLJCC-IX hinhlh&nh bdi he thdng song iron khuc (meandering nver 5ystem) Mii m:^ He thong song uon Hinh P.Mohmh Igacoclhdn\cat tong chiio khu ntc nghien cdn 12.11J l^m giiim rong va dp tham, tdc giam mdc dp luu thdng khoang vat tao da chu yeu g d m thach anh (51,6%), tiep CLia chat luu, anh hudng xau den chat lucrng da chda Chi theo la lagng n h d h a n K-feldspar, plagioclase, mica, cal- c6 mpt qua trinh bien ddi thir sinh lam tang rong, cite, dolomite Dac biet siderite hien dien kha nhieu la qui trinh hda tan khoang vat kem ben vdng da khoang d d sau (16,4%) Ket q u i phan tich t h ^ n h (feldspar), hinh nen dp rong t h d sinh va cai thien phan set cho thay illite chiem uu the, it h o n la kaolinite va chat luong da chira (Hinh 7f) [7, 9,10] De danh gia chi tiet ve phan khoang vat tao da va phan set di kem, 22 mau vun da daoc phan tich bSng phuong phap nhieu xa Ronghen (XRD) [7,8] chlorite cung m p t lUpng n h d set hdn hop Idp illite-smectite (Hinh 8) Smectite chi xuat hien d d p sau nhd hon 1.505 m (ham lupng 14,9-19%) cho thay dUOc tao t d set truong n d ngudn gdc nui lifa (volcanic montmorinollite), khd chuyen hda illite t r o n g mdi trudng bien Ket qua phan tich tdng ham lUong da cho thay DAU KHl - SO 5/2020 31 Tdng hop ket q u i nghien edu (thach hoc lat mdng, SEM va XRD) cho thay cat ket khu VUc nghien cilu cd chat luong chda td trung binh tdi k h i , ddi chd chat luong chda dUoc cii thien tdt hon (via chda phat hien dau tai gieng C-IX d siu 1.230 - 1.350 m) do rong cua d i dUOc b i o tdn, it chiu i n h hudng CLia q u i trinh xi mang hda va lap nhet bdi khoang vat thd sinh 3.2.2 Phdn bo c u o cdc via c / i u o Theo ket q u i phan tich di thudng bien nghjch d i o dia chan, khu vUc nghien edu tdn tai mdt sd via chda c i t ket hinh thinh bdi he thdng sdng udn khuc (Hinh 9) Tuy nhien, cac via chUa phat trien khdng lien tuc va phan bd pham vi hep < km- (Hinh 10) Mdt sd via cd the lien thdng vdi nhau, viy tuong ddi khd xac dinh dp sau ranh gidi khep kin cua bSy/tang chin [2] Tai gieng khoan C-IX, da p h i t hien hydrocarbon tai t i p d i chda Miocene dadi d dp sau 1.230 -1.250 m Ket qua minh giai dia vat ly gieng khoan (LWD) cho thay day la via san pham chda dau (Hinh 11) So bd tinh t o i n cho thay truf lupng tai chd khu vUc gieng khoan C-IX khdng Idn, nhung da khing dinh hoat ddng tich cue ciia he thdng dau tai ria Tiy Nam khu vUc nghien edu, gpi md cho cdng tac tim kiem, tham dd thdi gian tiep theo 3.3 Dgc diem tang chan Ket qua khoan gieng C-IX da xac dinh ' dupc tang ch3n nde la cic tap set nSm phia tren t i n g da chUa Miocene dadi, tuang dng mnhll.MdtcdtdiocMnminhhoakiidnor.Q'hii 32 Diu KM SO5J2020 vdi be mat ngap Iut FS, FSl 20 tren mat cStdiach3n(Hinhl2) Cic dirt gay ddng vai trd ch^n bien t^i gi^ng C-IX duac xic dmh nhu Hinh 13 Tuy nhien, kha nang chan bien cua dirt giy phu thudc vao gia tri SGR (Shale Gouge Ratio), tUc ty phan set tai cac via nSm ben canh dirt gay Cac via phan gida va tren (Upper & Middle Layer) cd gia trj SGR thap {< 0,3), tdc ty phan set thap, ddng thdi cd su tiep xuc mdt phan gida cac via ham laong c i t cao han b^n canh sut vdi cinh ning, viy dirt gay gan nha khdng chan Cac via phan dadi (Lower Layer} cd gii trj SGR Idn hon (0,3 < SGR < 0,6), tdc ty' phin set cao hon, ddng thdi via cat ben canh ning tiep xiic vdi via set ben cinh sut, vay dut gay cd kha nang chin tdt [2,11] 3.A Djch chuyen dau va tgo bay Ket q u i nghien edu md hinh dja hda khu vac thuc hien bdi JOGMEC va VPI [12] cho thi'y, da me khu vUc be Malay -Thd Chu duac hinh t d cic tang sinh dam hd (lacustrine) tudi Oligocene - Miocene dudi va tang sinh chau tho - sdng (fluvial - deltaic) tudi Miocene gida - tren cd nguon gdc tCr than, duoc di cU vdi k h o i n g cich Idn (> 100 km) t d trung t i m be Malay den khu vuc nghien edu (Hinh • BIdgMfc pn-^tt) Oas Oocw Anomaly CIustM' A 14)112,13] Hmh IS Ket qua phan uch mau dio hoa be ma! khu vUC nghien ciiu jUj V ^ ^ ^ ^ ^ ^ ^ ^ l i\i chSn ^ ' » •gH-l„'l-H,TI,T;WiniM-T,'IH'il,',-l'.ri3 Hinh 16 Co (he dich chuun hydrocarbon vao bi) ciu'a ' DAU KHI - SO 5/2020 TiAMN-IlAintlCBUKfll Hmh 17 Bay chua dang h6n hap cau true nghiin cuu 121 Khio sit dia hda be mat thac hien bdi Idemitsu [13) cho thay mat dp cao den trung binh cua d i u nhe [C^^ • C,J tap trung d phan Tiy Nam cua Id, nc^ cd gieng khoan C-1 X Dieu dd cho thay d i u da duoc di cu den td trung t i m eiia be Malay Dau va cung di eU, nhung di thoat sdm hon cd mat dp va nhdt thap hdn (Hinh 15) Tai khu vuc nghien edu, dau duoc nap vao bay theo co che dich ehuyen ngang tif tang sinh tdi cae t i n g chda va dieh ehuyen th^ng dutig thdng qua kenh dan la cac ddt gay {Hinh 16) Dich chuyen th^ng ddng thudng mang tinh dja phuong khu vUc phat tnen nhieu dirt gay, dd dich chuyen ngang cd pham vi anh hudng Idn hon [13] Tuy nhien, khoang cich dau ed the djch chuyen ngang td tang sinh tdi cac tang chda, dac biet la khu vife ria be van can phii tiep tyc nghien edu, lam rd Ket qua phin tich nghich d i o dia chan (simultaneous inversion} [2,11] cho thay, khu vUc nghien edu ton tai cic loai bay: ke ap dirt gay (it gap dirt gay Idn khu 1S Mat cdi dia chdn phimg!ay Bdc-Dong:, Rui ro ehinh ddi vdi play mdng la nang ehin ndc va chat luong t i n g ehua lien quan den thinh phan thach hoc da mdng (cd the Ii da bien chat, tUong tU khu vUc gieng khoan 46-KM-lX) Gieng khoan C-IX da khoan vao tang set day 10 m (xic dinh bdi gia tri GR cao d dudi ranh gidi FS40) cho thay day cd the la tang chin ndc (mdt ph5n) cho play mdng Tuy nhien, Idp set kha mdng v i thay ddi phan theo chieu ngang (da bat gap nhieu Idp cat ket/bdt ket d tren va dUdi tap set tai gieng khoan C-IX) nen kha ning chin ndc tiem an riil ro Idn (Hinh 18) Vdi cac thdng tin cd dupc den thdi diem hien tai, cd the thay play mdng khu vac nghien edu cdn tdn tai nhieu rui ro dja chat.Tuy nhien, thdng tin ve ddi tupng mdng cdn han che nen viec nghien cUu, danh g i i chi tiet tiem nang dau play mdng cin tiep tuc dupc tien hanh trien khai cdng tie tim kiem tham dd tai khu vUe Trao ddi va th^o luan vac), bay nep Idi (thudng cd dien tich khep kin cau tao kha nhd), bay ke ap mdng (gap nhieu riii ro lien quan den tang Ket qua phan tich nhiet phan Rock-eval [6] tai khu vUc chin) va b i y dia tang/hdn hop cau true - dia tang (thudng gieng khoan C-IX (dp sau 1.230- 1.235 m, 1.235- 240 cd quy md nhd) m, 1.240-1.245 m, 1.245-1.250 m vai.530-1.535 m) cho Trong khu vuc Ld A & B, bay dia tang tdn tai d phia thay da me cd ngudn gde dam ho (lacustrine), vdi luong Nam, nhung di thudng hydrocarbon lai nam tren eanh nhd vat chat hdu ca ngudn goc luc dja Cd mau than d nang cua ddt gay phia Bae v i phia Tay cua Ld A & 8, sau dd sau 965 - 970 m va 1.400 -1.405 m rat giau ham luang vat ehat hdu cO |TOC tuong dng 47,52% va 42,38%} va cd tiem nang sinh dau ra't tdt (S2 tuong Ung 144 23 kafT va 130,22 kg/T) ' ^ dudi 1.090 m Do vay, bay chda d d i y duoe xae dinh la bay dang hdn hop cau true - dia tang (Hinh 17) 3.5 Play mong Da me tai gieng khoan C-U co phin xa vitrinite Trong be Malay -Thd Chu, hien cd gieng khoan 46-KM- R„ = 0,35 - 0.43%, Tmax < 435 C cho thiy da me chua dat 1X khoan den ddi tuong mdng va da xic dinh duoe ngudng trudng thanh, nen hydrocarbon khdng dupc sinh phan da mdng chd yeu la da bien chat (metamorphic) 13] tai cho ma di cu tU noi khae den Mot so mau (dd sau 230 34 Diu KM SO 5/2020 - m v i 1.235 - 1.240 m) cd tinh c h i t tuong tU vdi D i me khu vac nghien edu Ii cic tang sinh tao mau dau/condensate cd mat d khu vuc khic be Ma- mdi trUdng d i m hd (lacustrine) v i tang sinh chau lay - Thd Chu Nhu vay, nhdm tac gia eho rang da me khu thd - sdng (fluvial - deltaic) tuoi Miocene gida - tren cd vuc nghien edu duoc di cU den td trung tam be Malay (ed ngudn gde t d than, ham luong v i t chat hdu co thay ddi td net taong ddng vdi da me d md Pergau va East Piatu phia trung binh den tdt, chu yeu sinh dau va (kerogen loai Malaysia) Nhan dinh cung phii hop vdi cic ket q u i 11 va HI) Diu dUpc di cU td trung t i m be Malay (phia nghien edu ve md hinh dia hda tien hanh bdi Idemitsu va Malaysia) den khu vyc ria Tay Nam be Malay - Thd Chu va Vien DSu Viet Nam (VPI) n i m 2013 [13] Ket qua phan tich tong hop ve thach hpe eho thay nap vao bay chda dang hdn hop eau true - dja tang, vdi su chiem Uu the cua dau nhe cac khoing vat tao da va khoang vat set di kem tai khu Da chda la cic via cat hinh bdi he thdng sdng vuc nghien edu it chiu anh hudng eiia qua trinh chdn viii udn khiic (meandering channel} mdi trudng sdng (burial) Chung duae van ehuyen den t d mdt khoing each (fluvial) den ddng bang ven bien (coastal plain), p h i n xa so vdi ngudn cung vat lieu, cd the chuyen tiep tU bd pham vi hep va be day khdng Idn Phin loai da mdi trudng sdng cho den dong bang ven bien (chju anh chda chu yeu la loai sub-litharenite va sub-arkose, vdi chit hudng eiia dieu kien sdng den thuy trieu) Chat luong d i luong chda thay doi td kem tdi trung binh, ddi chd duoc chda chju sUchi phdi Idn cua t h i n h p h i n cic khoang v i t c i i thien tdt hon, tiiy thudc ham lUpng xi mang va mdc dd thd sinh cic via chda Theo dd, cung vdi su tdn tai bien ddi cua khoing vat thU sinh d i CLia xi mang g^n ket carbonate, su cd mat phong phu ciia cac loai set cd ti'nh truong nd (smectite, illite-smecite) cd inh hudng tieu cue den k h i n i n g bao tdn dd rong cung nhukhi nang lau thdng ciia cic chit luu, tdc lam g i i m rdng va dp tham eua da chda [7] D i chan la cac tap set xen kep cac via than hinh mdi trudng dam lay ngap lyt (mangrove sw/amp), cd be day khdng Idn khu vuc ria Tiy Nam cua be He thdng dau tram tich De Tam khu vac nghien edu duPc d u bao tdn tai cic cum bay chda tiem nang, Phat hien dau 20 m via chUa c i t ket Miocene dudi cho thay tap set n i m phia tren ddng vai trd tang chin ndc Riil ro chan bien ciia dirt g i y lien quan tdi ty phan set va tiep xue gida eac via ham luong set thap d nhien it ed k h i nang bat gap d quy md Idn Ddi vdi tang mdng, tdn tai nhieu riii ro lien quan den k h i nang chin ndc, cCing nhu b i n chat thach hpc (thanh phan bien ehat) ciia d i mdng c i n dupc tiep tyc nghien edu va lam rd ben cinh dirt gay [2] Macducadau v i cung dicUtdphia Malaysia den phia Viet Nam, nhung bj di thoat trade cd mat dp Tai lieu tham khao [1] Simon P.Todd, M.E.Dunn and A.J.G.Bawise, va nhdt t h i p hon Vdi khoang each kha Idn (> 100 km) "Characterizing petroleum systems in the tertiary of SE td trung tam be, dU bao chii yeu dau nhe (ham lUong C^^ Asia", Petroleum geology of Southeast Asia, Geological -C,J dicu dupe den phan ria Tiy Nam be Malay-Thd Chu Society London Special Publications, Vol 126, No 1, pp 12,13] 25 - 47,1997 DOI: 10.1144/GSL.SP1997.126.01.04 Theo dinh g i i cua nha thau phat hien khdng dem [2] Idemitsu, "The geological and geophysical tinh thupng mai, nhUng viec tim dau d gieng khoan evaluation report for Blocks 39 & 40/02, offshore Vietnam", C-1 X nam tUPng ddi xa cac khu vUc da cd p h i t hien va cac Final report, 2018 mo dang khai thic (cich md Sdng Ddc gan nhat khoang 50 km ve phia Tay Bae), cho tha'y tiem nang dau d khu vUc van la an sd hap dan ddi vdi cdng t i c tim kiem, [3] Tap doan Dau Viet t^am, Dia chat va Tai nguyen Dau IchiVietNam Nha xuat ban Khoa hoc va Ky thuat (tii ban, sda chda va bd sung), 2019, tr 443 - 491 thim dd thdi gian tdi [4] Andrew D Mlall, Principles of sedimentary basin K^t luan Ket qua khoan gieng C-IX vdi phat hien dau analysis (3'" updated and enlarge edition) Springer, 2000 [5] Thomas Hantschel and Armin I.Kauerauf, tang chda Miocene dUdi da khang dinh hoat dpng tich Fundamental of basins and petroleum systems modeling cue ciia he thdng d i u tai khu vyc ria Tay Nam be Malay Springer, 2009 -Thd Chu, la ea sd de tiep tue day manh edng tac tim kiem, thim dd khu vUe niy [6j VPI, "Geoehemieal evaluation for cutting samples of 40/02-C5-1X well" (final report), 2018 Diu KHl SO 5/2020 35 TUMR OAlIUCIAin (7] VPI, "Petrography, SEM and XRD analyses of [8] Robert LFork, Petrology of sedimentary rcxks Austin,Tex: Hemphill's BookStore, 1980 [9] Joan E.V^elton, SEM petrology atlas American Association of Petroleum Geologists, 1984, Vol [10] FJ.Pettijohn, Sedf'mentory rocks (second edition) geoehemieal technology" Phase Malay - Tho Chu basin Final report for collaborative study, 2009 II3] JOGMEC and Idemitsu, 'Joint study in the Blocks 39 and 40/02, offshore Vietnam'(final report), 2013 114] Petronas, The petroleum geology and resources of Malaysia, 1999, pp 665 New York: Harper & Brothers, 1957 [11] Idemitsu, 'The geological and [12] VPI and Idemitsu,-Characterization of petroleuni system in Vietnam by State-of-the-art 40/02-CS-l X weir, (final report), 2018 geophysical evaluation report for drilling proposal of an exploration well in the C-South prospect Blocks 39 & 40/02, Offehore Vietnam" (final report), 2017 [15] A.Sutoto, -The use of LWD and its impact on petrophysical evaluation in the Belida field, Block'S; south Natuna Sea", Indonesian Petroleum Association, 23'" Annual Convention 1994 CHARACTEraSATION OF PETROLEUM SYSTEMS IN THE SOUTHWESTERN MARGIN OF MALAY - THO CHU BASIN, OFFSHORE VIETNAM Hoang Anh Tuan', Trinh Xuan Cuong', Nguyen Thu Huyen' 'Vietnam Oil and Gas Group 'Vietnam Petroleum Institute Email: tuanha03(2)pvn.vn Summary Results of recent explorations found hydrocarbon accumulation in Lower Miocene reservoir at the C-IX well, approx 50km northwest of Song Doc productive field, and have confirmed the active petroleum systems in the southwestem margin of the Malay - Tho Chu basin in Vietnam The paper presents research results on the characteristiG of the petroleum systems in the investigated area, including source rocks, reservoirs, seals, hydrocarbon migration and traps on the basis of integrated cutting sample analyses from the C-IX well in combination with regional geological and geophysical data The obtained results contribute to a better understanding of the petroleum systems in the southwestem margin of Malay-Tho Chu basin, and encourage further exploration activities in this area in the future Key words: Petroleum system, source rock, reservoir, sea!, southwestem margin, Malay - Tho Chu basin 36 DAU XKI so 5S030 ... systems modeling cue ciia he thdng d i u tai khu vyc ria Tay Nam be Malay Springer, 2009 -Thd Chu, la ea sd de tiep tue day manh edng tac tim kiem, thim dd khu vUe niy [6j VPI, "Geoehemieal evaluation... Vietnam", C-1 X nam tUPng ddi xa cac khu vUc da cd p h i t hien va cac Final report, 2018 mo dang khai thic (cich md Sdng Ddc gan nhat khoang 50 km ve phia Tay Bae), cho tha''y tiem nang dau d khu. .. (kerogen loai Malaysia) Nhan dinh cung phii hop vdi cic ket q u i 11 va HI) Diu dUpc di cU td trung t i m be Malay (phia nghien edu ve md hinh dia hda tien hanh bdi Idemitsu va Malaysia) den khu vyc