Structure Mapping at Trap Spring Oilfield, Nevada, Using Controlled-source Magnetotellurics
This article gives a particularly good description of the CSAMT method, a type of CSEM surveying in which the transmitter is placed far field from the receiver. At the time of this article, this field practice was necessary to simplify the mathematics involved in modeling the data but is no longer necessary with modern inversion software. Thus the method predominantly known as “CSEM” by the petroleum industry is referred to as “CSAMT” in early research and today the terms are interchangeable.
The advantages of using CSEM geophysics exploration techniques for oil-field reconnaissance revealed in this Zonge case study are as relevant today as they were in the 1980s. It was then that Zonge first began recommending an integrated, stepped methodology combining EM with seismic investigations.
Scott Urquhart, president and managing geophysicist, Zonge International
48th Meeting of the European Association of Exploration Geophysicists 1986; First Break, 1987; Vol. 5; pp. 403-418.
Norman R. Carlson*, Larry J. Hughes, Zonge Engineering & Research Organization, Inc., Tucson, Arizona, U.S.A.
Paper – [pdf] O&G_CSAMT_Oilfield-FirstBreak1987
CSAMT has a penetration of about 2 km in typical petroliferous environments. CSAMT does not replace seismic but functions in three specific roles: (1) as a reconnaissance tool to help focus seismic coverage, or to help avoid “no-record” zones; (2) to assist in static corrections and in interactive seismic interpretation; and (3) as a primary tool in certain environments