**Exhibit 31.2**

Certification of ChiefFinancial Officer

Pursuant to Rule13a-14(a) of theSecurities Exchange Act of 1934

 

I, Daniel C. Sibley,certify that:

 

1.               I have reviewedthis annual report on Form 10-K of Reef Global Energy IV, L.P. for the fiscalyear ended December 31, 2006;

 

2.               Based on myknowledge, this annual report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.               Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this report;

 

4.               The registrant’sother certifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) for the registrant and have:

 

a)              Designed such disclosure controls andprocedures, 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)             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

 

c)              Disclosed in thisreport any change in the registrant's internal control over financial reportingthat occurred during the registrant's fourth fiscal quarter that has materiallyaffected, or is reasonably likely to materially affect, the registrant'sinternal control over financial reporting.

 

5.               The registrant’sother certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of registrant’s board of directors (or personsperforming the equivalent functions):

 

a)              All significantdeficiencies and material weaknesses in the design or operation of internalcontrol over financial reporting which are reasonably likely to adverselyaffect the registrant’s ability to record, process, summarize and reportfinancial information; and

 

b)             Any fraud, whether ornot material, that involves management or other employees who have asignificant role in the registrant’s internal control over financial reporting.

 
| Date: April 17, 2007 |   | /s/ Daniel C. Sibley              |
|----------------------|--------|-----------------------------------|
|                 |   | Daniel C. Sibley                  |
|                 |   | Chief Financial Officer           |
|                 |   | Reef Oil & Gas Partners, L.P. |

 

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