EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this registration statement of our report dated February 25, 1997, included in the Core Laboratories N.V. Form 10-K for the year ended December 31, 1996 and to all references to our Firm included in this registration statement. /s/ARTHUR ANDERSEN LLP ARTHUR ANDERSEN LLP Houston, Texas December 29, 1997