Dense low-permeability reservoir natural fracture distribution pattern prediction method and system

Abstract

The invention provides a dense low-permeability reservoir natural fracture distribution pattern prediction method and system, and the method comprises the steps: building a natural fracture distribution pattern conceptual model; carrying out fine dissection on the reservoir configuration by utilizing rock core data and logging data to obtain distribution data of the interlayer interface; accordingto the explanation of the seismic data, identifying and obtaining distribution data of local structures of faults and wrinkles; identifying the natural fractures according to the rock core data and the logging data, and analyzing to obtain the range of limiting longitudinal extension of the fractures by the mechanical property and thickness of the interlayer interface relative to the rock; and obtaining a prediction result of the natural fracture inter-well distribution pattern by taking the natural fracture distribution pattern conceptual model as a macroscopic constraint. According to the method and the system, the position of the natural fracture can be well predicted, the distribution pattern of the natural fracture can be well described, and a geological basis is provided for oil-gasexploration and development of the compact low-permeability reservoir, so that the risk cost of oil-gas exploration and development of the compact low-permeability reservoir is reduced.

Description

technical field [0001] The invention relates to the field of reservoir geology research, in particular to a method and system for predicting the distribution patterns of natural fractures in tight and low-permeability reservoirs. Background technique [0002] Tight and low-permeability reservoirs have huge oil and gas resources, but the reservoir matrix has poor physical properties, strong heterogeneity, and natural fractures commonly develop, making exploration and development difficult. Natural fractures are important reservoir spaces and seepage channels in tight low-permeability reservoirs, which affect the accumulation, enrichment, single well productivity and development effect of reservoir oil and gas. Exploration and development provide geological basis. [0003] Predicting the distribution of natural fractures is a difficult and hot issue in the study of reservoir fractures. At present, the methods for predicting the distribution of natural fractures at home and ab...

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Problems solved by technology

[0003] Predicting the distribution of natural fractures is a difficult and hot issue in the study of reservoir fractures. At present, the methods for predicting the distribution of natural fractures at home and abroad mainly include the reservoir geomechanics method and the prediction method based on pre-stack and post-stack seismic attributes. These prediction methods mainly predict The development zone of natural fractures, clearly where there are fractures, where there are no fractures, and the relative strength of fracture development, but for the distribution pattern of natural fractures in the reservoir, these methods are difficult to predict, so it is difficult to finely describe the distribution of natural fractures

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