**Exhibit 31.1**

 

Certification ofPrincipal Executive Officer

Pursuant to 15U.S.C. Section 7241, as Adopted

Pursuant to Section 302of theSarbanes-Oxley Act of 2002

 

I, Michael J. Mauceli,certify that:

 

1)              I have reviewed this Quarterly Report on Form 10-Qfor the fiscal quarter ended March 31, 2009, of Reef Global Energy IV,L.P. (the “Registrant”);

 

2)              Based on my knowledge, this report doesnot contain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this report;

 

3)              Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the Registrant as of, and for, the periods presented in thisreport;

 

4)              The Registrant’s other certifying officerand I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))for the Registrant and we have:

 

a)              Designed such disclosure controlsand procedures, or caused such disclosure controls and procedures to be designedunder our supervision, to ensure that material information relating to theRegistrant, including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which thisreport is being prepared;

 

b)             Designed such internal control overfinancial reporting, or caused such internal control over financial reportingto be designed under our supervision, to provide reasonable assurance regardingthe reliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generally acceptedaccounting principals;

 

c)              Evaluated the effectiveness of theRegistrant’s disclosure controls and procedures and presented in this reportour conclusions about the effectiveness of the disclosure controls andprocedures, as of the end of the period covered by this report based on suchevaluation; and

 

d)             Disclosed in this report any changein the Registrant’s internal control over financial reporting that occurredduring the Registrant’s most recent fiscal quarter (the Registrant’s fourthfiscal quarter in the case of an annual report) that has materially affected,or is reasonably likely to materially affect, the Registrant’s internal controlover financial reporting; and

 

5)              The Registrant’s other certifying officerand I have disclosed, based on our most recent evaluation of internal controlover financial reporting, to the Registrant’s auditors and the audit committeeof the Registrant’s board of directors (or persons performing the equivalentfunctions):

 

a)              All significant deficiencies andmaterial weaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affect theRegistrant’s ability to record, process, summarize and report financialinformation; and

 

b)             Any fraud, whether or not material,that involves management or other employees who have a significant role in theRegistrant’s internal control over financial reporting.

 
| Date: May 14, 2009 | By: Reef Oil &  Gas Partners, L.P.    |
|-------------------------|------------------------------------------------|
|                    | Managing General  Partner                      |
|                    |                                           |
|                    | By: Reef Oil &  Gas Partners, GP, LLC |
|                    |                                           |
|                    | By:                                            | /s/ Michael J. Mauceli |
|                    | Michael J. Mauceli                             |
|                    | Manager and Member                             |
|                    | *(principal executive officer)*                |

 

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