Quantitative prediction method for different-scale fractures of low-permeability reservoir under constraint of rock mechanical layer

Abstract

The invention belongs to the field of oil exploration, and particularly relates to a quantitative prediction method for different-scale fractures of a low-permeability reservoir under constraint of a rock mechanics layer, which comprises the following steps: establishing a single-well fracture development mode, establishing a well-connected fracture development mode, dividing fracture scales, performing a rock mechanics experiment, performing mechanical parameter logging interpretation and dynamic-static correction, dividing various levels of rock mechanical layer structures, establishing a three-dimensional geomechanical model, determining a key fracture forming period, performing three-dimensional ancient stress field simulation, deducing and establishing a soft and hard interbed rock multi-stage fracture criterion and a fracture parameter mechanical characterization model, and performing quantitative prediction on fractures of different scales of a low-permeability reservoir, and finally verifying the reliability of a crack quantitative prediction result through well point actual measurement data. According to the method, the multi-scale fracture parameters of the sand-mudstone interbed type low-permeability reservoir can be accurately obtained and quantitatively represented, the method is suitable for fracture quantitative prediction work of any stratified structure reservoir, and the risk and cost of exploration and development are reduced.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a method for quantitatively predicting fractures of different scales in low-permeability reservoirs under the constraints of rock mechanical layers. Background technique [0002] In recent years, with the world's increasing demand for oil and gas energy and the continuous deepening of oil and gas exploration, global oil and gas exploration has gradually changed from conventional to unconventional, from shallow to deep and even ultra-deep, and low-permeability and ultra-low-permeability reservoirs have been widely accepted. Pay attention to and continuously make breakthroughs, among which the fracture prediction of different scales has become one of the current research hotspots. In low-permeability reservoirs, structural fractures are the key factors to improve reservoir physical properties and increase oil and gas productivity. Accurate descriptio...

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Problems solved by technology

The key problem is that the complex fracture mechanism of this composite rock mass is still unclear, and a reasonable strength and mechanical model has not been established to solve the characterization of fracture "quality" (crack generation, expansion) and "quantity" (crack scale, number) question

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