Shale oil adsorption capacity and movable capacity evaluation model as well as establishment and application method thereof

Abstract

The invention belongs to the field of shale oil occurrence and shale oil quantitative evaluation, and in particular relates to a shale oil adsorption capacity and movable capacity evaluation model as well as an establishment and application method thereof. Based on a capillary condensation theory, the shale oil adsorption capacity and movable capacity evaluation model is established under laboratory conditions, thus a shale oil adsorption capacity which is as shown in the description, a movable capacity Qc=(betaV2-kdS2hn)p2, a total occurrence amount Qt=Qa+Qc, and the respective percentage of the adsorption capacity and the movable capacity can be quantitatively calculated; the model application method is established under reservoir conditions, a hydrocarbon adsorption capacity and the total occurrence amount are expressed into a function of porosity and apparent density; the hydrocarbon adsorption capacity, the movable capacity and the percentages of the hydrocarbon adsorption capacity and the movable capacity are evaluated according to distribution of the porosity and oil saturation evaluated by well-log data in the longitudinal direction of a shale reservoir; and the method is simple, convenient and easy to operate, high in accuracy, strong in operability and practicability and convenient for geological popularization and application.

Description

technical field

[0001] The invention belongs to the field of shale oil occurrence and its quantitative evaluation, and in particular relates to an evaluation model of shale oil adsorption amount and movable amount and its establishment and application method. Background technique

[0002] With the continuous consumption of conventional oil and gas resources and the increasing energy demand of countries all over the world, unconventional oil and gas has become the focus of oil and gas exploration all over the world, and its position in the energy structure is becoming more and more important. There are abundant shale oil resources in lacustrine mud shale reservoirs in my country, and shale oil is expected to become another important alternative energy source after shale gas in the future. Shale oil (a mixture of various hydrocarbons) mainly exists in the pores and fractures of shale reservoirs in the adsorbed and free states, and its fluidity is affected by many factors. How...

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