Abstract
The successful production of unconventional resources such as shale gas is highly dependent on its two reservoir properties, organic matter and rock brittleness. High resolution spatially characterization of these two unconventional reservoir properties needs surface reflection seismic data. However, to delineate these two parameters on seismic scale is a challenging task because poor correlation is observed between these parameters and elastic properties of the rock. To encounter this adversity in current study we proposed effective attributes method in which organic shale reservoir properties are divided into their hard and soft elastic response. From the analysis of worldwide laboratory dataset, we find that hard and soft components have shown us much better linear correlation with P- and S- wave impedance. The proposed effective attributes, helped us to reduce the gap between unconventional reservoir properties and seismic characteristics. These attributes are the main controlling factor for rock elastic properties and exhibit information about hydrocarbon generation capacity and rock brittleness. A well data example from Sembar shale has also shown successful results for proposed effective attributes methodology. These attributes application on inverted P-wave impedance seismic data of employed organic shale reservoir have shown productive results to quantify its unconventional prospect on seismic scale. The approach used in this study can be confidently employed to assess unconventional reservoir potential in other parts of the world.
Highlights
Organic shale has been habitually regarded as the source rock in conventional petroleum system
We propose a concept to separately link the soft and hard components of organic shales with elastic properties to directly to characterize it on seismic scale
We proposed various effective attributes by integration of different strong and weak components to their respective P-and S-wave impedance
Summary
Organic shale has been habitually regarded as the source rock in conventional petroleum system. Still one of the main challenge for geophysicists is to remotely locate unconventional resources on seismic data because there exists a gap to directly link elastic parameters and organic shales reservoir properties. This gap exists due to heterogeneous nature of shales, mineralogical composition and hydrocarbon maturity level[1,10,15,16,17,18,19]. We propose a concept to separately link the soft and hard components of organic shales with elastic properties to directly to characterize it on seismic scale This approach is favorable to simplify complex factors and can help to relate relevant elastic properties to reservoir parameters
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