November 12, 2020 “Luncheon” Webinar- Andres Chavarria

11/12/2020 @ 12:00 pm – 1:00 pm

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Date(s) - 11/12/2020
12:00 pm - 1:00 pm

Via Webinar


November 12, 2020 DGS Luncheon Webinar

Multiwell Fiber Optic Acquisition for Fracture Network Analysis

J. Andres Chavarria, Oilfield Services Technical Director, OptaSense, Los Angeles, CA


Analysis of fracture networks with fiber optic in unconventional reservoirs has traditionally been conducted with a single monitoring fiber. This fiber can be located within monitor or treatment wells and different measurements can be taken based on the vantage point. Increasingly the need to better understand the formation of fractures and their effect on production has led to fiber deployments that include more than one fiber for far or near/far field monitoring. Here we discuss some of the challenges and opportunities present while sensing with multiple fibers.

Joint analysis of multi fiber strain and microseismic data reveals that the low frequency DAS data responds to the locally generated fracture network. The DAS microseismic response on the other hand includes activity away from the stage zone and likely relates to changes in pore pressure and stress conditions in the surrounding rocks neighboring the treatment stage.

The joint analysis of the strain and microseismic data from a multifiber system further reveals that the stress shadow delineated by the strain front can provide the framework for understanding microseismic events generated within it.

Strain fronts from fiber optic provide a direct diagnostic of the geometry of the fracture zone that is been treated by the injection process. Real time assessments of fracture geometries without the need for inversion have led to wide adoption of the technology. Increased sensitivity and capability to record strain and microseismic simultaneously has led to reductions in acquisition costs from additional instrumentation. Here we show how multiple fibers can enhance 3D microseismic mapping while providing actionable completions data from the strain monitoring.

Andres Chavarria is OptaSense’s Oilfield Services Technical Director. His current focus is the use of distributed sensing fiber optic data for engineering and geoscience applications.  

He has a background on borehole seismology (MS and VSP) and was previously the Geophysical Processing Manager at OptaSense, SR2020 and Paulsson. He has conducted work in other areas of geophysics including mining and groundwater. He holds an Engineering Degree on Geophysics from the National University of Mexico and a PhD Degree on Geophysics from Duke University.


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