For tight oil horizontal completion, optimization of reservoir modeling and fracture design relies highly on correct understanding of the relationship between production and reservoir characteristics. Due to reservoir heterogeneous properties, it is also challenging to understand the relevant correspondence between the production and petrophysical and petromechanical stage characteristics. Understanding stage contributions during initial and short to medium term production is the first and important step to reveal such a relationship.

This article describes an effort in using chemical tracers to evaluate initial oil and water productions in a horizontal multi-stage fracture well. Determining an exact contribution per stage of oil and water in initial production is achieved here for the first time. This quantitative understanding of how each stage has contributed to the comingle production in initial production provides increased understanding of the correlation between stage production and reservoir characteristics.

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