--> ABSTRACT: Geological Interpretation of Combined Nuclear Magnetic Resonance and Formation Microelectrical Data to Reduce Risk, by J. W. Roestenburg; #91021 (2010)

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Geological Interpretation of Combined Nuclear Magnetic Resonance and Formation Microelectrical Data to Reduce Risk 

ROESTENBURG, JON W.

Offshore Western Australia is today an exciting "world class" hydrocarbon province with proven prospectivity and numerous challenges for continued oil and gas discoveries. The reservoirs range in age from Triassic-Mungaroo Formation (Ladinian) to Cretaceous-Windalia Sandstone (Aptian) and are dominated by siliclastic accumulations including fluvio-deltaic, nerito-paralic and turbiditic deposits. Many of these reservoirs are diachronous and show evidence of cyclicity and complex facies associations, thereby increasing exploration and exploitation risk. New formation measurements, innovative integration techniques and interpretation methodologies are used for rapid economic decision making and risk reduction.

On the Wonnich-1 discovery well, both nuclear magnetic resonance measurement and electrical borehole images are combined to enhance geological interpretation and understanding. Combinable Magnetic Resonance (CMR{TM}) data are used to give an indication of sorting, textural maturity and bedform evolution which is combined with Formation Micro Imaging (FMI{TM}) data, for geobody orientation, diagenesis and architecture. Using T[2] distribution data, pore size distributions are classed into unimodal and bimodal populations which are indicative of facies maturity and boundaries. Sedimentological analysis of current bedding gives an indication of flow regime and direction during deposition and, combined with derived permeability, show post-depositional diagenesis. In situ stress responses are derived directly from the borehole images to establish the relationship between past and present stress states. Further bedding plane analyses established the well's position on structure. 

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.