How much do you know about the principles of hydrocarbon generation and expulsion modeling?
Shenjia Hydraulics
Release Date:
2023-02-09
The field of hydrocarbon generation and expulsion simulation holds great promise, as it delivers numerous benefits to enterprises during application, making it highly favored by clients. To help you gain a deeper understanding, we will now explain the underlying principles of this simulation technique, with the hope of providing valuable insights to a wider audience.
The field of hydrocarbon generation and expulsion simulation holds great promise, as it delivers numerous benefits to enterprises during application, making it highly favored by clients. To help you gain a deeper understanding, we will now explain the underlying principles of this simulation technique, with the hope of providing valuable insights to a wider audience.
Today, many people still lack a basic understanding of the fundamentals of hydrocarbon generation and expulsion simulation. As manufacturers, it is therefore our responsibility to provide a brief explanation. In essence, generation and expulsion simulations employ advanced calibration techniques to measure core porosity, permeability, and porosity under confining pressure conditions. During operation, core samples are loaded into the sampler, geometric parameters for each core and the required confining‑pressure data are entered into the software, and testing can begin. The system automatically advances the core into the core holder, applies radial and axial pressures to simulate formation overburden, initiates permeability prediction, and automatically selects either helium or nitrogen for permeability measurement. It then proceeds to measure porosity and permeability. Following this, radial and axial pressures are released; once testing is complete, radial vacuum is applied, and a line printer automatically outputs real‑time measurement results. In practice, when the gas pressure distribution along the sample length has stabilized, the pressure at any point along the sample varies only with displacement, not with time. Alternatively, a specified pressure may be imposed at the sample inlet, and after the inlet and outlet pressures have reached steady state, permeability is calculated using the appropriate formula.
In addition, when conducting a hydrocarbon generation and expulsion simulation, it is important to note that this method is not suitable for measuring low-permeability samples that do not obey Darcy’s law, nor even for medium- or high-permeability samples. At low permeabilities, the time required for pressure stabilization is longer, resulting in slower measurement rates. Furthermore, a pressurized gas reservoir is connected at the sample inlet; at the start of the measurement, the reservoir is linked to the sample entry point, and the pressure change over time is recorded. Under these conditions, you will observe that the gas pressure distribution along the sample length varies with both position and time. The sample’s permeability can be calculated—without waiting for pressure equilibrium—based on the pressure changes in the gas reservoir over time and the relevant parameters. This approach is applicable across a wide range of permeability values, particularly for low-permeability samples, and offers relatively rapid measurements. In summary, hydrocarbon generation and expulsion simulations enable experiments on the generation of soluble organic matter, solid kerogen‑derived hydrocarbons, and pyrolytic gases; they can also simulate the diagenetic evolution of source rocks. Moreover, such simulations allow for the quantitative recovery of both solid and liquid products. Here, we are a reputable manufacturer; if you’re interested in ordering this product, feel free to visit us and make your selection. We are confident you will not be disappointed. Our prices are reasonable, and our quality is guaranteed. In addition, we offer a diverse range of product types, ensuring there is always one that suits your needs. We warmly welcome you to browse and purchase.
The above article has introduced some relevant information about the principles of hydrocarbon generation and expulsion modeling. If you weren’t familiar with it before, now’s a good time to take a look. In the next installment, we’ll cover more related topics—don’t forget to tune in!
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