US 2021/0062645 A1 · ANISOTROPY MODEL GUIDED FRACTURE PROPERTIES EXTRACTION FROM VSP DATA

Abstract

A DAS VSP technique is used to determine the induced fracture height and fracture density of an induced fracture region. The DAS VSP technique obtains pre-hydraulic fracturing DAS VSP survey time-lapse data to establish a baseline reference for the direct acoustic wave travel time. The DAS VSP technique obtains one or more time-lapse data corresponding to the subsequent monitor surveys conducted after each hydraulic fracturing stage along the well. Forward modeling is used to determine a theoretical acoustic wave travel time difference. The forward modeling uses seismic anisotropy to describe the behavior of seismic waves traveling through the induced fracture regions. An inversion scheme is then used to invert for the induced fracture height and the fracture density using the forward modeling. The two extracted induced fracture characteristics may then be used to determine optimal hydraulic fracturing parameters.

Claims20

Dependent claims

A method comprising:

determining a first travel time difference based on distributed acoustic sensing vertical seismic profile data collected before and after a well stimulation operation in a well with optical fiber;
determining a second travel time difference based on forward modeling for the well;
and
determining a fracture height and fracture density with inversion based on a time lapse difference between the first and second travel time differences.

1 more element

A system comprising:

a processor;
and
a machine-readable medium having instructions stored thereon that are executable by the processor to cause the system to,
determine a first travel time difference based on distributed acoustic sensing vertical seismic profile data collected before and after a well stimulation operation in a well with optical fiber,
determine a second travel time difference based on forward modeling for a well, and
determine a fracture height and fracture density with inversion based on a time lapse difference between the first and second travel time differences.

3 more elements

Dependencies are inferred from the claim text.

Anisotropy model guided fracture properties extraction from vsp data

Life of this patent

Anisotropy model guided fracture properties extraction from vsp data

Life of this patent

Abstract

Claims20