Well logging prediction method of shale gas horizontal well single well production capacity

Abstract

The invention provides a well logging prediction method of shale gas horizontal well single well production capacity. The method comprises the steps of firstly conducting well logging of interval transit time, density and neutron porosity in a drilled horizontal well, and recording the penetrating depth of a horizontal well section and the corresponding vertical depth; then using formation density well logging and compensated neutron well logging information to calculate formation brittle mineral content; utilizing the three well logging curves of the interval transit time, the density and the neutron porosity which reflect formation porosity in the well to calculate the formation porosity; utilizing a method of inverting reservoir permeability through stoneley wave attenuation to solve formation permeability; utilizing an organic carbon content experiment measurement value a stone sample taken in a formation and density well logging to establish a relation to obtain a calculation formula of organic carbon content; utilizing the formation organic carbon content to calculate to obtain formation gas saturation; finally according to the formation brittle mineral content, the formation porosity, the formation permeability and the formation gas saturation to calculate to obtain the daily production capacity of single well shale gas.

Description

technical field [0001] The invention relates to the technical field of exploration and development of unconventional natural gas reservoirs, in particular to an in-well detection technology for initial production when drilling and producing gas reservoirs in the horizontal direction, and in particular to a logging prediction method for single-well productivity of a shale gas horizontal well. Background technique [0002] Productivity prediction is a very important link in oil and gas exploration and development. It is a comprehensive evaluation index for reservoir quality, reservoir fluid properties and oil and gas production capacity, and it is also one of the most important indicators. Shale gas reservoirs are characterized by ultra-low porosity and permeability; and part of the gas is adsorbed on the surface of reservoir rock particles and exists in the reservoir in an adsorbed state. Therefore, large-scale fracturing is required before shale gas wells are put into product...

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Problems solved by technology

Since shale gas reservoirs are more complex than conventional gas reservoirs, and shale gas reservoirs in different regions also have their own regional characteristics, the evaluation of shale gas reservoirs in China is mostly in the stage of exploration and development. In the analysis of shale gas production capacity The analytical method and the numerical simulation method are more applied to theoretical research, and are not practical in actual production applications

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