|Title||Effect of reservoir characteristics on the productivity and production forecasting of the Montney shale gas in Canada|
|Author||Kim, G; Lee, H; Chen, Z H; Athichanagorn, S; Shin, H|
|Source||Journal of Petroleum Science & Engineering vol. 182, 106276, 2019., https://doi.org/10.1016/j.petrol.2019.106276|
|Alt Series||Natural Resources Canada, Contribution Series 20200241|
|Media||paper; on-line; digital|
|Province||British Columbia; Alberta|
|Subjects||fossil fuels; Science and Technology; shales; gas; productivity; reservoirs; Montney Formation; Triassic|
|Illustrations||Venn diagrams; tables; plots; graphs|
|Released||2016 07 18|
|Abstract||Shale gas is a typical unconventional gas trapped in a tight shale formation, which is considered as a source as well as reservoir rock. Therefore, the productivity of shale gas is closely related to
the reservoir parameters making it very important to understand the characteristics of shale reservoirs. In this study, the production data of Montney shale was analyzed and the impact of the reservoir characteristics on the productivity was
quantified. The reservoir characteristics can be divided into the reservoir quality (RQ) and completion quality (CQ) parameters. The productivity of shale gas, which is defined as the production decline variables, such as the peak monthly rate (PMR),
the initial decline rate, and the decline exponent, was compared with the RQ and CQ. Among the CQ parameters, the brittleness index (BI) was found to affect the overall decline trend in production and had a qualitative correlation with the initial
decline rate and decline exponent. Moreover, among the RQ, the total organic carbon (TOC) is closely related to the PMR and the amount of organic carbon (S1) already generated as hydrocarbon is strongly correlated with the initial decline rate and
the decline exponent, especially in the transient linear flow regime. Therefore, it is possible to quantify the effects of the organic carbon contents on the productivity of shale gas and estimate the production in the transient linear flow regime.
|Summary||(Plain Language Summary, not published)|
This research delved into shale gas, a special type of natural gas found in dense shale rock formations. The main goal was to understand how certain
factors affect the productivity of shale gas, which is essential for the energy industry. They used data from Montney shale to figure this out.
The factors that impact shale gas productivity were divided into two groups: reservoir quality (RQ) and
completion quality (CQ). They looked at measures like peak monthly rate (PMR), initial decline rate, and decline exponent to assess productivity.
The findings revealed some crucial relationships. Among CQ factors, something called the brittleness
index (BI) was linked to the overall decline in gas production. It also showed a connection with how fast gas production declines initially. Among RQ factors, the total organic carbon (TOC) was tied to the PMR. The amount of organic carbon (S1)
already transformed into hydrocarbons was strongly connected to the initial decline rate and how the production declines over time, especially in the early stages.
Understanding these relationships can help predict shale gas productivity and how
it changes over time. This is important for the energy industry as shale gas is a significant source of energy globally.