Quantitative evaluation method for fracture development strength of single well of tight sandstone reservoir

Abstract

The invention provides a quantitative evaluation method for fracture development strength of a single well of a tight sandstone reservoir, and the method is characterized by comprising the following steps of 1) determining a fracture identification characteristic parameter of the single well of the reservoir; 2) determining a fracture comprehensive indication parameter of the single well to be evaluated according to the fracture identification characteristic parameter of the single well of the reservoir, and quantitatively identifying the fracture layer of the single well to be evaluated according to the fracture comprehensive indication parameter of the single well; and 3) determining a fracture development strength index of the single well to be evaluated, and quantitatively evaluating the fracture development strength of the single well to be evaluated according to the fracture development strength index of the single well. The quantitative evaluation method provided by the invention can accurately identify the fracture development interval of the single well to be tested by using the conventional logging data, and can quickly quantitatively evaluate the fracture development strength of the single well to be tested at the same time with high accuracy.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating fracture development strength of a single well in a tight sandstone reservoir, belonging to the field of well logging technology. Background technique [0002] Tight oil and gas, as an unconventional oil and gas resource, is one of the research hotspots in the petroleum industry. Due to the characteristics of low porosity and low permeability of tight sandstone reservoirs, it is difficult to effectively develop them. The development of fractures has an important impact on the productivity of tight sandstone reservoirs. Fractures can not only be used as oil and gas storage spaces, but also important oil and gas seepage channels. [0003] At present, there are two main types of quantitative characterization methods for the strength of fracture development in tight sandstone reservoirs in a single well, namely core indication method and well logging indication method. Quantitative evaluati...

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Problems solved by technology

However, the core and imaging logging fracture strength evaluation technology is only suitable for evaluating the fracture development strength of a single well with cored or imaging logging data, and the existing probability model in the conventional logging fracture strength evaluation technology can only do However, it is impossible to make a quantitative evaluation. The quantitative evaluation of the fracture development strength by the fracture opening degree has a large error, which cannot truly reflect the fracture development of a single well.

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