Single-well moment tensor inversion of tensile microseismic events

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F16%3A00463429" target="_blank" >RIV/67985530:_____/16:00463429 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1190/geo2016-0186.1" target="_blank" >http://dx.doi.org/10.1190/geo2016-0186.1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1190/geo2016-0186.1" target="_blank" >10.1190/geo2016-0186.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Single-well moment tensor inversion of tensile microseismic events

Popis výsledku v původním jazyce

Microseismic data acquired in a single observation well parallel to the axis of rotational symmetry of surrounding rocks - typically, in a vertical well drilled through a horizontally layered isotropic or vertically transversely isotropic formation - cannot be uniquely inverted for six independent components comprising the full seismic moment tensor. To constrain the inversion for such a survey geometry and medium symmetry, one might assume certain physical properties of seismic sources, the properties relating otherwise independent moment components to each other, regularizing moment tensor inversion, and helping reduce its ambiguity. Our paper examines one possibility of this kind: the assumption of a tensile fracture, rupturing the focal region along a plane of its greatest weakness. Mathematical formulation of inversion of single-well microseismic records for the parameters of tensile fractures reveals that the true solution, always recoverable from properly acquired data, might be accompanied by two spurious solutions. The analysis of those solutions leads to a criterion that, although not perfect, makes it possible to select the correct solution for the majority of elastic models. After being tested on synthetic, our methodology is applied to a field data set recorded with multiple vertical downhole arrays, demonstrating that the results of dual-well moment tensor inversion can be replicated with single-well data.

Název v anglickém jazyce

Single-well moment tensor inversion of tensile microseismic events

Popis výsledku anglicky

Microseismic data acquired in a single observation well parallel to the axis of rotational symmetry of surrounding rocks - typically, in a vertical well drilled through a horizontally layered isotropic or vertically transversely isotropic formation - cannot be uniquely inverted for six independent components comprising the full seismic moment tensor. To constrain the inversion for such a survey geometry and medium symmetry, one might assume certain physical properties of seismic sources, the properties relating otherwise independent moment components to each other, regularizing moment tensor inversion, and helping reduce its ambiguity. Our paper examines one possibility of this kind: the assumption of a tensile fracture, rupturing the focal region along a plane of its greatest weakness. Mathematical formulation of inversion of single-well microseismic records for the parameters of tensile fractures reveals that the true solution, always recoverable from properly acquired data, might be accompanied by two spurious solutions. The analysis of those solutions leads to a criterion that, although not perfect, makes it possible to select the correct solution for the majority of elastic models. After being tested on synthetic, our methodology is applied to a field data set recorded with multiple vertical downhole arrays, demonstrating that the results of dual-well moment tensor inversion can be replicated with single-well data.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DC - Seismologie, vulkanologie a struktura Země

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysics

ISSN

0016-8033

e-ISSN

—

Svazek periodika

81

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

"KS219"-"KS229"

Kód UT WoS článku

000392926400067

EID výsledku v databázi Scopus

2-s2.0-84997328029