Petrophysical Analysis of Well Logs for Reservoir Evaluation: A case study of Khartoum Basin, Block 9

Abstract

Abstract

Khartoum basin ” Oil

Field is an onshore field located of the 14 30 N at north and of 15 53 S , at

south mainly between the Blue Nile and white Nile of the central of Sudan , which at began to

develop in the late Jurassic

-

Early Cretaceous .

The general purpose of we

ll log analysis is to convert the raw log data into estimated quantities

of oil, gas and water in a formation of the study area, In this study, the objectives of using

the gamma ray (GR), resistivity, neutron (PHIN) and density (PHID) log

s includes the

determination of lithology units, to identify reservoir.

Core porosity and permeability measurements are done , used flow zones index (FZI) and

reservoir quality index (RQI) method to define Hasan

-

1 and Gazira

-

1 reservoir well .

That has

similar hydraulic properties. The method uses a modified version of the Carman

-

Cozen equation

and the mean hydraulic radius concept.

(GR) log which measures natural radioactivity in formations , was used in the

identification of sand

/shale lithology in the study area, Estimating VSHALE from GR linear,

produces an overestimation of the VSH , corrections linear VSH=f(IGR), Larionov for tertiary

rocks or young rocks, Larionov for older rocks, or even Stieber and Clavier to determine

pay

zone. the zones of interest (Swagir formation) were defined in terms of zones with effect

porosity (low GR and high porosity).

Which estimates

from density

and neutron

logs.

Resistivity logs were evaluated to determine a cut

-

off value for

the determination of net pay. By

using average porosity values determined from

well log

neutron

-

density effective porosity

calculations for each facies, the true

resistivity values

needed in order to produce hydrocarbons

with water

saturation.

The Rt valu

es determined from Pickett

plot analysis

were selected as the

cut

-

off values to determine the net pay interval. The pay thickness of the

Swagir reservoir

ranges

from 25 feet

-

40 feet

Lithology

correlation of equivalent strata across the four wells

was done using the

gamma ray logy and resistivity logs to know their lateral and vertical extent.

The log analysis performed in this study shows that the reservoir Swagir and Abu

J

in sand

formation of Khartoum basin field contain

significant accumulations of hydrocarbon

.

IV

الخلاصة

تمدَ ٘رٖ اٌدزاس

ة

ٔتبئج تحٍيً ِجّٛع

ة

ِنٓ اٌصانبئا اٌجيٛزيصئبئين

ة

ٚاٌبتسٚزيصئبئين

ة

، ِنٓ اعن

ة

لبِنب

GR

،)

إٌيٛتسْٚ

PHIN

)، ٚاٌىثبز

ة

(PHID)

، ٚإٌفبذئن

ة

، ٚاٌّسنبِي

ة

ٚتشنب اٌسنٛائً، زنو نٛخ اٌصسمنَٛ ِس ن

9

، اٌٛال يٓ إٌيً الاشزق ٚإٌيً الا يض يٓ خطو

63

47

عّبلا

، ٚ

48

86

جٕٛ ب.

ٚاٌنر ندف زنو اٌتطنٛز

زو فٚاخس اٌ اس اٌجٛزاسو اٌو دائٗ اٌ اس اٌطببعيس

ٚاجس اٌتحٍيً ٌتمييُ ٚتحدئد اٌّىبِٓ اٌٙيدزٚوس ٛٔي

ة

، ٚدزاسٗ خابئا اٌّىّنٓ

اسنتٕبدا اٌنو يبٔنبل اٌسنجً

ِٓ اٌبئس ٌٍّٕبمك اٌّتٛل زيٙب تٛاجد اٌنٕف وبٌطبمنبل اٌّسنبِي

ة

اٚ اٌطبمنبل اٌسٍِين

ة

)، ٚزنو ٘نرٖ اٌدزاسن

ة

تنُ

تحدئد اٌّسبِية ٚاٌتشنب ، تمينيُ اٌ ةلنة نيٓ اٌّسنبِية ٚإٌفبذئنة، ٌٍت نسح عٍن سنحٕة ٚ خانبئا اٌّىّنٓ ي

Hasan

-

1

Gazira

-

1

. بستصداَ

مسئ

مة

FZI

اٌتو ٘و فوثس دلة

ٍتٕبؤ ٌصانبئا اٌّىّنٓ

ٚ ند

اٌ

تندزك

اٌٙيدزٌٚيىية.

ِٚٓ اٌٛسبئً ٚاٌتمٕيبل اٌتو استصدِت زو ٘رٖ اٌدزاس

ة

Techlo Software

) ٌتمدئس اٌطبمبل اٌطيٕين

ة

بستصداَ اع

ة

لبِب

GR

) اٌنر ئمنيا إٌشنبلإ ااعن بعو اٌطبي نو زنو اٌتىٛئٕنبل اٌطبمينٗ، ٚ

حسنبة اٌّؤعنس

اٌصطو

Linear

) ٚ٘را ٘نٛ اٌشنبئ . ٚرينس خطنو ٚئنستب ّنس اٌطبمنبل

Larionov,Stipber,Clavier

)

ٌٍ اس اٌطببعيس ٚ

Larionov

) ٌ اس الدَ ِنٓ ذٌنه

تشنىيً

Swagir

)

سنجٍت

GR

ِٕصفضن

ِٚسنبِية

عبٌية

اٌتو اخرل

ِٓ اٌىثبزة ٚإٌيٛتسْٚ

.

تنُ تمينيُ سنجةل اٌّمبِٚننة ٌتحدئند اٌميّنة إٌٙبئينة ٌت

منندئس أتبجينٗ اٌصنصاْ

. بسنتصداَ لننيُ اٌّسنبِية

اٌف بٌنة

ٌىننً

سحٕة

ِنٓ سنجً إٌينٛتسْٚ

اٌىثبزنة

ٚاعن ٗ لبِنب

، ٚلنيُ اٌّمبِٚنة اٌحميمينة اٌةشِنة أتنبي اٌٙيندزٚوس ٛٔبل

ِمبزٔٗ

ِ تشب اٌّيبٖ

بسنتصداَ مسئمنة

يىينت.

جند اْ

سنّه اٌصنصاْ

Swagir

ئتنساٚ

ِنٓ

58

لندَ

-

73

لدَ

.

وّننب تننُ ائضننب اسننتصداَ اٌتحٍننيةل اٌاصسئ

ة

،اٌّسننبِي

ة

)

بسننتصداَ فعنن ة جبِننب ٚسننجةل اٌّمبِٚننة

سزنن

ة

الازتببمبل اٌطبمي

ة

اٌتو تتشبزن زو ٔفا اٌسحٕ

ة

لاز ٗ ا بز

(Al demogratia

-

1, Gazira

-

1, Hasan

-

1

and Sudan

-

6)

، ٚاٌٙنندح

ِننٓ ٚزاذ ذٌننه ٘ننٛ ِ سزنن

ة

اِننبوٓ اٌتجّ ننبل إٌفطينن

ة

ٚتساويبٙننب ٚالاسننتفبد

ِٕٙننب

ٚويفي

ة

استمةٌٙب.

ِٓ ٔتبئج ٘رٖ اٌدزاسة تبيٓ فْ اٌصصاْ

اٌسٍِو

Swagir

Abujin

ئحتٛ عٍ تساوّبل ِٓ إٌف ٚاٌغبش