Logging analysis method and system for rapidly evaluating shale adsorption gas energy

Abstract

The invention discloses a logging analysis method and system for rapidly evaluating shale adsorbed gas energy. The logging analysis method comprises the steps that S1, the clay content Ci in shale to be analyzed is calculated; S2, a kerogen thermal evolution degree value K and an organic carbon content value TOC are extracted; S3, the rock density rho of hydrocarbon source rock and the thickness value H of gas generation rock are extracted; and S4, according to a formula Age = Ci * rho * H * (K + 1) TOC / 104, an adsorption gas energy index Age is calculated and the adsorption gas energy index Age is output. According to the logging analysis method and system for rapidly evaluating the shale adsorption gas energy, by fully considering the adsorption capacity of adsorbed gas adsorbents, namely clay minerals and kerogen, the content of the clay minerals, the abundance of organic matters in the kerogen, the hydrocarbon generation thickness, the thermal evolution coefficient of the hydrocarbon source rock and the density of the hydrocarbon source rock are analyzed by applying real-time logging parameters, and a logging field calculation method for the shale adsorbed gas energy is established. The analysis distance can be adjusted or encrypted according to on-site geological conditions, long well sections and continuous analysis can be achieved, the defects that in an existing detection method, samples are greatly limited, the number of analysis points is small, the distance is short, and the measurement period is long and expensive are overcome, and compared with measured data, the logging analysis method and system for rapidly evaluating the shale adsorption gas energy is good in coincidence and high in consistency.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to a mud logging analysis method and system for quickly evaluating the energy of shale adsorbed gas. Background technique [0002] As an unconventional natural gas resource, shale gas is not only a potential alternative energy source for conventional natural gas, but also a clean and environmentally friendly energy source. Shale gas has a high content of adsorbed gas, which makes it different from conventional oil and gas layers, and its particularity requires a special evaluation method for mud logging. [0003] The occurrence state and gas composition of shale gas are quite different from those of conventional natural gas, including free gas in natural fractures and pores, adsorbed gas on kerogen and clay surfaces, and gas in kerogen and bitumen. Dissolved gas that exists in a dissolved state in a substance. The two contents of free gas and adsorbed...

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Problems solved by technology

[0007] The embodiment of the present application provides a logging analysis method and system for quickly evaluating the energy of shale adsorbed gas, which can continuously calculate the well sections that need to be analyzed, and can realize rapid calculation and analysis during drilling, and overcome the limitations of existing detection methods. The existing samples are limited, the analysis points are few, the interval is short, and the measurement cycle is long and expensive.

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