Nghiên cứu đá móng carbonate nứt nẻ khu vực lô 102 106 bằng tài liệu địa vật lý giếng khoan

z? -IS- PETROVIETNAM

NGHIEN CUU OA MONG CARBONATE NUT NE KHU VUC LO 102 - 106

BANG TAI LIEU OjA VAT LY GIENG KHOAN

ThS. Nguyen Van Hoang, ThS. Nguyin Anh OiJfc

Tong cdng ty Thdm do Khai thdc Ddu khi

Email: [email protected]

He thong nUt ni ddng vai trd rdt quan trpng doi vdi khd ndng thdm chUa vd cho ddng cua dd chda carbonate ndt

ni. Cd nhieu phucfng phdp dia vdt ly gieng khoan dupc dp dung de phdt hiin vd nghiin cdu cdc ddi ndt ni nhu phUdng

phdp hinh dnh gieng khoan FMI-FMS, STAR-CBIL, chi so hdp thu quang diin (photoelectric factor-Pef), diin trdsudt,

cdc dudng siiu dm, dudng mat dd, dddng caliper, bii'u hiin cdc dinh khi ddi vdi dudng cong do Karota khi... vd ddng

thdi dung cdc phucmg phdp ndy dexde dinh dp rdng ndt ne cho dd carbonate.

TUkhda:L6 102 -106, beSdng Hong.

1. Gidi thieu

Ld 102 -106 thudc b l tram tich Sdng Hong, phia Ble

them lye dja Viet Nam dUoc hinh thanh td dja hao dang

keo tach ed hUdng Tay Ble - Ddng Nam dupe khdng che

d hai canh bIng cac diit gly trUdt thuan ngang (Nguyen

Manh Huyen va nnk, 2007). SU va cham eUa 2 mIng Ddng

Duong va A - Au d giai doan Eocene - Oligocene sdm la

khdi dau ciia boat ddng diift gay d khu vyc, sau dd la hoat

ddng van xoSn theo chieu kim ddng hd va keo tach. Be

tram tich trl i qua mot Ijch sd phat triln td Paleogene den

nay vdi nhilu pha nen ep, tach gian, nghich dIo, bao mdn

elt xen va liin chim nhiet. Be Sdng Hdng cd nhilu don vj

cau true, tuy nhien d Ld 102 - 106 dUpc chia lam 3 khu vUc

chinh (Hinh 1):

Khu \i\lc Tay Nam (nlm d phia Tay Nam cCia duft

gly song Chly va thude them ddn nghieng Thanh Nghe)

vdi cac phUc hdp da biln chat tudi Proterozoie, tram tich

carbonate v l tram tfch lye nguy#n

tudi Mesozdic vdi chilu day tram tich

xap xi 2.000m.

Trung Trung tam (nlm d glCfa

diit gly Sdng Ld va Sdng Chly) bj Inh

hudng rat manh bdi hoat ddng kiln

tao nghjeh dSo trong sudt thdi ky

Miocene, tham chf Ien tdi Pliocene;

Viing Ddng Ble (nlm d phia

Ddng B^c ciia ddt gay Sdng Ld)

duoc chia tic h thanh 2 phan thI m

Ha Long v^ khu •vuc Bach Long Vi.

Them Ha Long la them d l mdng tudi

Paleozoic dUdc phd tr^n bdi tram

tich Cenozoie cd chilu day ~2.000m va cd cac dja hao

hep dpc theo dCft gay Sdng Ld cd the tdn tai dia hinh d l

vdl chdn viii bin trong. Ddi Bach Long VT bj Inh hudng

bdi hoat ddng kiln tao nghjeh dIo trong sudt thdi ky

Oligocene den Miocene sdm tao nen cac dja hao hep

bin trong.

Trong khu \i\ic Ld 102 -106 da khoan 9 gieng, trong

dd mot gieng cd phat hien khi d eau tao Thai Binh eho

lUu luong kha tdt trong tram tich cat ket Miocene giCfa;

phat hien dau, condensate, khf trong da mdng nut n l

carbonate trUdc Cenozoie d cau tao Ham Rdng.

2. Nghien cuTu he thong nuft nk b^ng cac phi/ang phdp

dja vat ly gieng khoan

2.1. Ddc diem cda dd mong carbonate ndt ni

Dp rdng trong da carbonate dupe chia lam 2 loai la dp

rong nguyen sinh va dp rong thd sinh.

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Hinh 1. Phdn viing khu vuc nghiin cilu cuo Ld 102 -106