Integrated approach to studying of secondary porosity in carbonates using special well logging data

Tuesday, 09 December 2014 Read 5238 times
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Different geophysical methods and processing techniques are used for studying of pore space in carbonate rocks, but system analysis necessitates for an integrated approach to the study of rock properties. One of the most efficient suites of specialized logging methods to study reservoirs with the mixed-type porosity is a joint analysis of data from the micro-imager, cross-dipole acoustic logging and also the formation tester.

An image generated from multiple micro-resistivity curves allows determining structural dip angles and azimuths, identifying vuggy intervals and fractures that are classified per type with the calculation of parameters, such as dip angle, strike azimuth, and aperture. This information is supplemented with the parameters of horizontal stress, such as anisotropy coefficient and azimuth determined with the properties of flexural waves combined with the information on permeable intervals from Stoneley wave properties, and also analysis of Stoneley wave reflections from interfaces of open fractures. Measuring formation pressure with the formation tester enables to identify hydrodynamic connection between reservoirs both vertically and laterally, to perform monitoring of depletion and determine local mobility from direct measurement data.

The results of the joint analysis of the geophysical method suite above are one of input parameters for the geological and hydrodynamic models, which allow evaluating their correlation with the field data (well operation parameters, results of seismic studies, analysis of well interference testing and tracer tests). Further iteration processing to select the best input parameters for the model with the adjustment of analysis methods of various tests contributes to the enhancement of models as the field is studied. Joint analysis of specialized logging suite data and field information with the help of the simulation model enables the interpreter to predict the presence of non-conductive disturbances in the reservoir body, predominant filtration directions, location of zones with higher reservoir properties, and also the presence of locally isolated features within a body previously believed to be uniform. These hydrodynamic models show the water breakthrough dynamics and the formation pressure drop rate. Currently, these simulation models are used to monitor the development status and to plan intervention and development strategy.

About the Author

Artem Syrmolotov - руководитель направления по интерпретации данных специальных методов геофизических исследований скважин. Окончил РГУНГ имени И.М. Губкина как горный инженер по специальности «Геофизические исследования скважин». Основными интересами являются комплексный анализ данных микроимиджеров, кросс-дипольного акустического метода и гидродинамического пластоиспытателя в совокупности с данными анализа комплекса стандартных методов ГИС.

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