Method and system for predicting natural fracture distribution patterns in tight low-permeability reservoirs

Abstract

The present invention proposes a method and system for predicting the distribution pattern of natural fractures in tight low-permeability reservoirs, wherein the method includes: establishing a conceptual model of natural fracture distribution patterns; using core data and logging data to finely dissect the reservoir configuration According to the interpretation of seismic data, the distribution data of the local structure of faults and folds can be identified and obtained; the natural fractures can be identified according to the core data and logging data, and the relative rock mechanical properties of the interlayer interface can be obtained by analysis. The thickness pairs limit the range of longitudinal extension of fractures; using the conceptual model of natural fracture distribution pattern as a macro constraint, the prediction results of the distribution pattern of natural fractures between wells are obtained. The method and system can better predict the location of natural fractures, and can better describe the distribution pattern of natural fractures, provide geological basis for oil and gas exploration and development in tight and low permeability reservoirs, thereby reducing the risk of oil and gas exploration and development in tight and low permeability reservoirs cost.

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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