Abstract
Investigation has been performed on natural fractures within carbonate formation in a block in Shunbei Oilfield. Classification has been done over natural fractures in the block. Patterns of distribution of natural fractures within the carbonate reservoir formation have been identified. Principal results include: 1) seismic data and sedimentation information along with history of tectonic movement have been used to analyze natural fractures. 2) It is found that natural fractures withinT74-T76 carbonate reservoir formation are generated by tectonic movement of middle Caledonian I and II periods, and are mainly through fractures/faults with strike-slip characteristics. 3) 3D finite element model was built for this block with seismic data. Numerical calculations of 3D Continuum Damage Mechanics were performed. Results of numerical forward modeling has given out the 3D distribution of natural fractures which are represented by the localization band of damage variables under loading of tectonic movement of middle Caledonian period.
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