Method and device for reconstruction of fracture network based on microseismic

Abstract

The invention discloses a fracturing fracture net rebuilding method and device based on microearthquake, and belongs to the technical field of oil exploitation. The fracturing fracture net rebuilding method comprises the following steps that data of a microearthquake monitoring point is primarily processed in the hydraulic fracturing process; fracture starting points of each fracture section are respectively used as starting points, and iteration rebuilding is performed to obtain a fracturing fracture net N of each fracture section; the seepage rate k of each fracturing fracture section in the fracturing fracture net N is calculated; the fracturing fracture nets N of all fracturing sections are merged; a discrete fracture network model is built; the production value simulation is performed; the obtained production value simulation value and the practical production value are subjected to production historical fitting; the accumulated distribution function of pressure values of all points of an oil deposit is solved; the inflection points of the function are used as the boundary pressure of the reservoir transformation volume, and a contour map is drawn; the shape and the range of the reservoir transformation volume generated by the current fracturing are obtained. The method and the device provided by the invention have the advantages that the shape and the range of the reservoir transformation volume can be accurately and objectively calculated; the information obtained through microearthquake can be remained to the maximum degree.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a microseismic-based fracture network reconstruction method and device. Background technique [0002] Due to the characteristics of low porosity and ultra-low permeability, shale gas reservoirs show low or no productivity in conventional gas testing in development, so it is difficult to achieve efficient development of shale gas reservoirs by conventional gas reservoir development methods. Therefore, horizontal well completion technology and multi-stage hydraulic fracturing technology are widely used in the development process of shale gas reservoirs. In the process of hydraulic fracturing, the natural fractures of the reservoir may be re-opened and interlaced with artificial fractures to form a complex fracture network. The area where the fracture network develops is called the stimulated reservoir volume (Stimulated Reservoir Volume, SRV), and its size and seepage char...

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Problems solved by technology

This method can quickly obtain a fracturing fracture grid that can be used for reservoir numerical simulation, but the structure of the grid is subject to the subjective influence of the researcher: choose different numbers and positions of main fractures, completely different net

Secondly, fracturing in shale gas development belongs to volume fracturing, and the entire stimulated reservoir volume is communicated by micro-fracture systems, while this method simplifies the fracturing results into a sparse main fracture network, which is different from the existing reservoir stimulated volume theory does not match

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