B. Kriegshäuser¹, O. Fanini¹, S. Forgang¹, P. Gupta², R. Mollison¹, J. van Popta³, L. Yu¹
(1) Baker Atlas, Houston, TX
(2) Roorkee University, Roorkee
(3) Shell EP Technology, The Hague

Abstract: Increased net pay in finely laminated low resistivity reservoirs using multi-component induction logging tool data

Productive low resistivity reservoirs are encountered frequently in hydrocarbon exploration. Proper identification and characterization of these reservoirs is essential to recover their reserves. An example of such a reservoir is a finely laminated sand/shale sequence found, for example, in turbidite environments, of which the sand laminae contain hydrocarbons. Conventional induction logging tools with transmitter and receiver orientation parallel to the borehole axis provide a resistivity, which is biased towards the low resistivity of the shales. A multicomponent transmitter-receiver configuration provides direct measurements of both horizontal and vertical resistivity which together much better reflect the hydrocarbon bearing sand laminae. Under the sponsorship of Shell EP Technology, Baker Atlas developed and tested a logging tool that utilizes this technology. Field tests confirmed the strong capability of this new induction tool to detect and characterize laminated productive zones in low resistivity intervals. The horizontal and vertical resistivity data provided by the tool are used to evaluate the net sand fraction and the sand laminae resistivity. The estimated hydrocarbon saturations derived with the new induction tool data are substantially higher than those based on conventional induction tool data. The higher oil saturations derived from the multi-component induction tool were confirmed with saturation estimates based on core capillary pressure data.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana