Shale gas horizontal well bedding fracture evaluation method based on array induction logging information

Abstract

The invention relates to a shale gas horizontal well bedding fracture evaluation method based on array induction logging information. Array induction electrical resistivity data of the horizontal section of a horizontal well in a work area with a longitudinal resolution being A and an investigation depth being B are collected, and fracturing section information of the horizontal section of the horizontal well in the work area is collected; the total number of sections of fracturing sections of the horizontal section of the horizontal well and the initial depth and the end depth of the ith section are collected; the array induction logging data are filtered, dynamic standard array induction electrical resistivity data are obtained, a model MARBD=MARB-MARBF is used, array induction electrical resistivity dynamic deviation data MARBD are calculated, the model is used for calculating array induction electrical resistivity dynamic deviation standard deviation sigma of the i section,and results of bedding fracture development of the horizontal section of the shale gas horizontal well are output. According to the shale gas horizontal well bedding fracture evaluation method, eightwells are applied, results show that the actual total sand adding amount of a single well is higher, and the gas production rate is higher in wells with more developed shale gas horizontal well bedding fractures based on array induction logging information evaluation.

Description

technical field [0001] The technical field of the present invention is shale gas exploration and development, in particular to a method for evaluating bedding fractures of shale gas horizontal wells based on array induction logging data. Background technique [0002] The exploration and development of shale gas has brought a new pattern to global energy. At present, the development of shale gas is mostly based on oil-based mud long horizontal well staged fracturing technology. The fracturing process of shale gas reservoirs uses fracturing trucks to squeeze liquids with high pressure, large displacement and a certain viscosity into shale gas reservoirs. After many fractures are pressed out in the shale gas layer, proppant (such as quartz sand, etc.) is added to fill the fractures to improve the permeability of the gas layer and increase the gas production. When the bedding fractures in horizontal wells develop, the strata are more likely to be opened, and the fractures forme...

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Problems solved by technology

[0003] The traditional method for evaluating the development degree of bedding fractures in horizontal shale gas wells mainly uses cores from vertical wells. Coring in horizontal shale gas wells is risky and costly. Evaluation of bedding fractures in shale gas horizontal wells directly through cores

Domestic shale gas horizontal wells are mainly drilled with oil-based mud drilling fluid, which makes it impossible to measure the ordinary micro-resistivity imaging logging. Schlumberger’s oil-based micro-resistivity imaging logging is expensive, so shale gas The evaluation of bedding fractures by micro-resistivity imaging logging data in horizontal wells has the disadvantages of less data and high cost

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