c i

February 1985

RKER.85.035GEOCHEMICAL INVESTIGATION OF CRUDE

OIL SAMPLES FROM WELL 6H07/9-1NORWAY

byF.M.van der Veen and J . Posthuma

This CONFIDENTIAL report is made available subject to the condition that the recipient willneither use or disclose the contents except as agreed in writing with the sponsoring party.

Copyright is vested in Shell Internationale Research Mij. B.V., The Hague.

KONINKLIJKE/SHELL EXPLORATIE EN PRODUKTIE LABORATORIUM

RIJSWIJK, THE NETHERLANDS(Shell Research B.V.)

u\

February 1985

RKER.85.035GEOCHEMICAL INVESTIGATION OF CRUDE

OIL SAMPLES FROM WELL 6407/9-1NORWAY

byF.M.van der Veen and J . Posthuma

Inves t !ga t i on:9.5.5142

This CONFIDENTIAL report is made available subject to the condition that the recipient willneither use or disclose the contents except as agreed in writing with the sponsoring party.

Neither the whole nor any part of this document may be reproduced, stored in any retrievalsystem or transmitted in any form or by any means (electronic, mechanical, reprographic,recording or otherwise) without the prior written consent of the copyright owner.

Neither Royal Dutch Petroleum Company nor The "SHELL" Transport and TradingCompany p.I.e. nor any company of the Royal Dutch/Shell Group will accept any liability forloss or damage originating from the use of the information contained therein.

Although SHELL companies have their own separate identities the expressions "SHELL" and"GROUP" are used for convenience to refer to companies of the Royal Dutch/Shell Group ingeneral, or to one or more such companies as the context may require. -

Copyright is vested in Shell Internationale Research Mij. B.V.. The Hague.

KONINKLIJKE/SHELL EXPLORATIE EN PRODUKT1E LABORATORIUM

RIJSWIJK, THE NETHERLANDS(Shell Research 8.V.)

lrl * mm

CONTENTS

1 . in t roduct i on 22. Conclusions 2

Table 1 Geochemica l d a t a of c rude o i l s

Figures 1-4 Gas chromatograms of saturatedhydrocarbons

5 C7 distributions of crude oil6 C15 and C30 ringdistributions7 Sterane and triterpane fragmentograms

ftKER 85.035

- 2 - CONFIDENTIAL

GEOCHEMICAL INVESTIGATION OF CRUDE OIL SAMPLES FROMWELL 6 4 0 7 / 9 - 1 , NORWAY

To invest igate the general character of acrude oil sample from well 6407/9-1(rftsample,1600M)the API has been determined and thesaturated fract ion of this sample(0MC 3359) has beenanalysed as requested in telex for 090804 of 9.8.84. Acomplete geochemical analyses has been carried out on aPT sample from the interval 1631 -1637M(OMC 3367) whichhas been sent l a t e r ( fo r 120906 of 12.9.84).

The resu l t s of the geochemical analyses aregiven in Table 1 and Figures 1-7.

The gas chrornatograms of the whole crude and ofthe saturated hydrocarbons show a gap between C10 andC15 while the crude has a high percentage of l ightfraction (<120C). This is rather unusual and i t cannotbe excluded that we are dealing here with a mixture ofa condensate and an o i l .

Assuming that the l ight and heavy fractions havethe same or igin , the complete oil analysis carried outon the PT sample indicates the following:-the C7 d i s t r ibu t ion indicate that th is sample has

not been bac ter ia l ly degraded,- i t has been expelled from a mature source rock

containing s t ruc ture less organic matter which is ofbac ter ia l ly reworked phytoplanktonic origin,

- the C7 d i s t r ibu t ion and the pristane n-C17 alkaner a t i o suggest a t e r r e s t r i a l influx to the organicmatter .

RKER 85.035

- 3 - CONFIDENTIAL

Table- 1 GEOCHEMICAL DATA OF CRUDE OILS

APIs p e c i f i c g rav i ty%v. b o i l . 120 deg C% sulphur

ppra V as metalsppm Ni as metals

Pristane/PhytanePri stane/n-C17Phytane/n-Ci8

C7-distributionC7-alkane

n-C7raonobranchedpolybranched

C7-alk/naphthenen-C7naphthenesbranched alkanes

C7-alk/napht/aromn-C7naphthenesaromati cs

C15-distri bution1-ring2-ring3-ring

C30-distributi on3-ring4-ring5-ring

C29 VR/E (DOM)

% asphal tenes

^saturatesJaromatics^heterocora pounds

<5 13C o / o o

- not determined

OIL SAMPLES WELL 6407/9"1,NOR WAY1635M(RFT) 1631-1637M(PT)OMC 3359

41 .20.8193

2.11 .00.5

OMC 336742. 2

0.814817.60.3

2.21 .00.6

49101 1

205822

40564

384220

254629

0.76(64)

622414

-28.6

RKER 85.035

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DPS CHROMPTCGRPM SR1URP1ED HTCRGCPRS3NS

FIG. 1. NCRWRT 6407/9-1 1635 M CMC 3359

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DR5 CHRGMRIOGRRM CF SfilURRTED HTDRCCfiR5SNS

FIG, 3, NORWflT 6 4 0 7 / 9 - 1 . 1 S3 i - 1 S37 M, GHC. 3367

IR \S> c P - ^ & K? .«- u 3 t J s

o o o o o o o o o2R

o o o

LflNDPLANT-DFRIVEO CRUDES NITH SUBSTRNTIfU RES IN CONTRIBUTION TO SOURCE MPT TERCRUDFS OF MIXED ORIGINCRUDES DFR1VED FROM SOM flND/OR RLGflt MRT TER

LE Gl-'NDQ - NGRWflT. 6 4 0 7 / 9 - 1 . 1631-1637 M,OMC.33G7

1680

3.6-1

MID røKS rHfifniATOGRAM DATA: SER8955 #1ENHANCED (366 IN 0T)

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