SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Corrigan Mark (Last) (First) (Middle) 153 EAST 53RD STREET 57TH FLOOR (Street) NEW YORK NY 10022-4624 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 04/01/2006	3. Issuer Name and Ticker or Trading Symbol SCHLUMBERGER LTD /NV/ [ SLB ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Vice President	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	5,987	D
Common Stock	1,061	I	SL Int'l P/S Plan

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(1)	07/16/2013	Common Stock	8,078	46.02	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(2)	04/21/2009	Common Stock	2,005	55.619	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(3)	04/17/2012	Common Stock	2,092	55.745	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(4)	01/19/2015	Common Stock	18,460	64.91	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(5)	07/21/2014	Common Stock	18,468	65.235	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(6)	04/15/2008	Common Stock	1,099	71.315	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(7)	10/19/2010	Common Stock	2,399	82.282	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(8)	10/21/2007	Common Stock	5,495	82.348	D
Employee Stock Option (right to buy) w/ tandem Tx w/h right	(9)	01/18/2016	Common Stock	29,079	108.47	D
Incentive Stock Option (right to buy)	(1)	07/16/2013	Common Stock	1,922	46.02	D
Incentive Stock Option (right to buy)	(2)	04/21/2009	Common Stock	8,984	55.619	D
Incentive Stock Option (right to buy)	(3)	04/17/2012	Common Stock	2,908	55.745	D
Incentive Stock Option (right to buy)	(4)	01/19/2015	Common Stock	1,540	64.91	D
Incentive Stock Option (right to buy)	(5)	07/21/2014	Common Stock	1,532	65.235	D
Incentive Stock Option (right to buy)	(7)	10/19/2010	Common Stock	601	82.282	D
Incentive Stock Option (right to buy)	(9)	01/18/2016	Common Stock	921	108.47	D

Explanation of Responses:

1. This option becomes exercisable in four equal annual installments beginning July 16, 2004.

2. Exercisable in five equal annual installments beginning April 21, 2000.

3. Exercisable in five equal annual installments beginning April 17,2003.

4. This option becomes exercisable in four equal annual installments beginning January 19, 2006.

5. This option becomes exercisable in four equal annual installments beginning July 21, 2005

6. The options became exercisable in five equal annual installments on April 15, 1999.

7. Exercisable in five equal annual installments beginning October 19, 2001.

8. The option becomes exercisable in five equal annual installments beginning October 21, 1998.

9. This option becomes exercisable in four equal annual installments beginning January 18, 2007.

	By: /s/Janet B. Glassmacher Attorney-in-Fact For: Mark Corrigan	04/05/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

                       SCHLUMBERGER LIMITED

                         POWER OF ATTORNEY

The undersigned in his capacity as a director or officer or both
of Schlumberger Limited, a Netherlands Antilles corporation (the "Company"),
does hereby appoint Janet B. Glassmacher, Lynda M. Quagliara and Ellen Summer,
and each of them severally, his true and lawful attorney-in fact with power
to act with or without the other and with full power of substitution and
resubstitution, to execute for him and in his name, place and stead, in his
capacity as a director or officer or both of the Company, a statement of
beneficial ownership on Form 3, Form 4, Form 5 or Form 144, and to file the
same or cause the same to be filed with the Securities and Exchange
Commission.  This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4, 5 and 144.


March  23 , 2006                     /s/ Mark Corrigan
                                      Mark Corrigan