RU2012152638A - Снижение артефактов при итерационной инверсии геофизических данных - Google Patents

Снижение артефактов при итерационной инверсии геофизических данных Download PDF

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RU2012152638A
RU2012152638A RU2012152638/28A RU2012152638A RU2012152638A RU 2012152638 A RU2012152638 A RU 2012152638A RU 2012152638/28 A RU2012152638/28 A RU 2012152638/28A RU 2012152638 A RU2012152638 A RU 2012152638A RU 2012152638 A RU2012152638 A RU 2012152638A
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approximation
iterative
model
inversion
physical properties
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Джером Р. Кребс
Сунвоонг ЛИ
Юнг Хо ЧА
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Эксонмобил Апстрим Рисерч Компани
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    • G06F30/20Design optimisation, verification or simulation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00Seismology; Seismic or acoustic prospecting or detecting
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V11/00Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
    • GPHYSICS
    • G01MEASURING; TESTING
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    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/002D [Two Dimensional] image generation
    • G06T11/003Reconstruction from projections, e.g. tomography
    • G06T11/006Inverse problem, transformation from projection-space into object-space, e.g. transform methods, back-projection, algebraic methods

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Abstract

1. Способ снижения артефактов в модели физических свойств геологической среды, вызванных приближением, отличающимся от кодирования источников, в итерационном компьютеризированном процессе инверсии геофизических данных, причем упомянутый способ включает в себя варьирование приближения в ходе выполнения итераций.2. Способ по п. 1, причем упомянутый способ включает в себя:(a) принятие модели физических свойств геологической среды, причем упомянутая модель обеспечивает значения, по меньшей мере, одного физического свойства в местоположениях по всей области геологической среды;(b) выбор итерационного процесса инверсии данных с шагом, в котором производится вычисление обновления модели физических свойств, что делает ее более совместимой с измеренными геофизическими данными, полученными в области геологической среды;(c) выполнение в упомянутом вычислении приближения, которое либо ускоряет выбранный итерационный процесс инверсии данных, способом, отличающимся от кодирования источников, либо работает с компромиссной точностью;(d) выполнение, используя компьютер, одного цикла выбранного итерационного процесса инверсии с упомянутым приближением и с использованием модели физических свойств;(e) выполнение, используя компьютер, следующего итерационного цикла инверсии, в котором делается выбор того, менять какой-либо аспект приближения, или не менять;(f) при необходимости, повторение (e), изменяя приближение в нескольких или во всех итерационных циклах, вплоть до последней итерации, в которой удовлетворяется критерий сходимости или достигается другое условие остановки; и(g) загрузку обновленной модели физических св�

Claims (15)

1. Способ снижения артефактов в модели физических свойств геологической среды, вызванных приближением, отличающимся от кодирования источников, в итерационном компьютеризированном процессе инверсии геофизических данных, причем упомянутый способ включает в себя варьирование приближения в ходе выполнения итераций.
2. Способ по п. 1, причем упомянутый способ включает в себя:
(a) принятие модели физических свойств геологической среды, причем упомянутая модель обеспечивает значения, по меньшей мере, одного физического свойства в местоположениях по всей области геологической среды;
(b) выбор итерационного процесса инверсии данных с шагом, в котором производится вычисление обновления модели физических свойств, что делает ее более совместимой с измеренными геофизическими данными, полученными в области геологической среды;
(c) выполнение в упомянутом вычислении приближения, которое либо ускоряет выбранный итерационный процесс инверсии данных, способом, отличающимся от кодирования источников, либо работает с компромиссной точностью;
(d) выполнение, используя компьютер, одного цикла выбранного итерационного процесса инверсии с упомянутым приближением и с использованием модели физических свойств;
(e) выполнение, используя компьютер, следующего итерационного цикла инверсии, в котором делается выбор того, менять какой-либо аспект приближения, или не менять;
(f) при необходимости, повторение (e), изменяя приближение в нескольких или во всех итерационных циклах, вплоть до последней итерации, в которой удовлетворяется критерий сходимости или достигается другое условие остановки; и
(g) загрузку обновленной модели физических свойств с последней итерации, или сохранение ее в памяти компьютера.
3. Способ по п. 2, в котором один или несколько типов артефактов в обновленной модели физических свойств геологической среды идентифицируются как вызванные приближением.
4. Способ по п. 3, в котором аспект приближения, изменяющийся в некоторых или во всех циклах итерации, выбирается для оказания влияния на артефакты одного или нескольких идентифицированных типов артефактов.
5. Способ по п. 4, в котором упомянутое влияние таково, что артефакты от одного приближения не складываются арифметически с артефактами от другого итерационного цикла, который использует приближение с измененным аспектом.
6. Способ по п. 2, в котором приближением является выбор подмножества измеренных геофизических данных для ввода в итерационный процесс инверсии, а измененным аспектом является другое выбранное подмножество.
7. Способ по п. 6, в котором каждое отличающееся подмножество выбирается случайным образом.
8. Способ по п. 1, в котором приближением является несовершенные поглощающие границы в моделировании синтетических данных в процессе итерационной инверсии.
9. Способ по п. 1, в котором приближением являются отражающие границы в моделировании синтетических данных в процессе итерационной инверсии.
10. Способ по п. 1, в котором приближением являются случайные граничные условия в моделировании синтетических данных в процессе итерационной инверсии.
11. Способ по п. 1, в котором приближением является пространственное изменение в размере ячейки сетки в моделирующем средстве конечных разностей в процессе итерационной инверсии.
12. Способ по п. 1, в котором приближением является пространственное изменение в точности оператора моделирования в процессе итерационной инверсии.
13. Способ по п. 1, в котором приближением является использование размера ячейки сетки в моделировании синтетических данных в процессе итерационной инверсии, причем размер ячейки сетки является слишком грубым для точного представления изменений в модели.
14. Способ по п. 1, в котором приближением является использование большого шага по времени в моделирующем средстве временной области в итерационном процессе инверсии, где "большой" определяется относительно других используемых шагов по времени.
15. Способ по п. 1, в котором итерационный, компьютеризованный процесс инверсии геофизических данных содержит вычисление градиентов функции стоимости, а приближение содержит использование менее точных условий поглощающих границ, чтобы сделать градиентные расчеты более точными.
RU2012152638/28A 2010-05-07 2011-03-14 Снижение артефактов при итерационной инверсии геофизических данных RU2573174C2 (ru)

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