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Abstract
The pore structure of shale gas reservoirs has strong heterogeneity, and the flow mechanism in multiscale media is complex. The fracture network of hydraulic fracturing is significantly affected by reservoir in situ stress, rock mechanical properties, and natural fracture distribution. At present, there is no efficient and accurate inversion method for fracture networks. Accurately describing fracture network morphology and flow capacity distribution of induced fracture is an important basis for production analysis, fracturing evaluation, and production plan. This article focuses on the hot issues of shale gas development, from three aspects: flow parameter characterization method of organic/inorganic matter, multiscale mass transfer simulation of shale gas reservoir, and inversion method of fracture network morphology and flow capacity, to introduce relevant research progress in detail. At the same time, the advantages and shortcomings of current related researches are compared and analyzed. Based on this, the key scientific problems existing on flow mechanisms and inversion method of fracture network in shale gas reservoirs are proposed, which can provide guidance for further research.
Highlights
Stable economic growth has led to an increase in demand for oil and gas, and conventional oil and gas resources have been unable to meet the large energy demand
On the basis of revealing the influence of the micropore structure of shale gas reservoirs on gas storage and migration capabilities, this paper proposes a new research idea for the flow characterization and morphology inversion method of induced fracture network
The mesh refinement method based on embedded discrete fracture model (EDFM) or discrete fracture model (DFM) can describe fracture network morphology accurately; it cannot reflect the flow difference between organic and inorganic shale
Summary
Stable economic growth has led to an increase in demand for oil and gas, and conventional oil and gas resources have been unable to meet the large energy demand. Due to the unusually complex spatial structure of matrix/natural fractures in shale gas reservoir and the large difference in fluid flow between different-scale media, it is more difficult to obtain the flow capacity of various induced fractures through dynamic fitting. Based on the investigation and analysis of inversion methods of induced fracture network, this paper proposes a new idea of fracture characterization based on the combination of fracture propagation calculation and multiscale flow simulation. On the basis of revealing the influence of the micropore structure of shale gas reservoirs on gas storage and migration capabilities, this paper proposes a new research idea for the flow characterization and morphology inversion method of induced fracture network. We will explore the research progress of inversion methods of induced fracture network of shale gas reservoirs
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