Deep-reading electromagnetic data acquisition method

US8812237B2 · kind B2 · utility

Assignees

• SCHLUMBERGER TECHNOLOGY CORPORATION · US
• SAUDI ARABIAN OIL COMPANY · SA

Inventors

• Michael J. Wilt · Walnut Creek, US
• Alberto Marsala · Bergamo, IT
• Steve F. Crary · Al Khobar, SA
• Saleh B. Al-Ruwaili · Dhahran, SA
• Tarek M. Habashy · Burlington, US
• Shouxiang Mark Ma · Dhahran, SA

Key dates

• Filing date: Feb 5, 2009
• Grant date: Aug 19, 2014
• Expiry date: Nov 21, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/30
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of measuring a parameter characteristic of a rock formation is provided, the method including the steps of obtaining crosswell electromagnetic signals between two wells and using an inversion of said signals to investigate or delineate the presence of a resistivity anomaly, such as brine in a low resistivity background, wherein the resistivity anomaly is assumed to be distributed as one or more bodies characterized by a limited number of geometrical parameters and the inversion is used to determine said geometrical parameters. The method can also be applied to determine the trajectory of an in-fill well to be drilled.