[ABSTRAK
Proses migrasi menggunakan domain sudut memberikan hasil pencitraan bawahpermukaan yang lebih baik dibandingkan dengan menggunakan metode Kirchoffkonvensional yang dilakukan dalam domain offset. Migrasi ini dilakukan dalamkawasan kedalaman yang memperhatikan variasi kecepatan secara lateralsehingga memberikan gambaran bawah permukaan yang lebih baik. CommonReflection Angle Migration (CRAM) Prestack Depth Migration (PSDM), migrasikedalaman dalam domain sudut, mampu memetakan titik reflektor bawahpermukaan yang berada dalam struktur geologi bawah permukaan yang cukupkompleks, salah satunya adalah untuk memetakan ketidakmenerusan objek bawahpermukaan dan imaging serta analisis struktur di bawah permukaan yangkompleks. Secara umum, metode CRAM dapat mengatasi kasus mutiarrivalconflicts, dengan menggunakan prinsip ray tracing dan multiray path yangmampu memetakan setiap titik bawah permukaan dari sinar yang datang dariberbagai arah menuju ke permukaan. CRAM dapat memetakan lapisan atau objekbawah permukaan yang kompleks, bersifat target oriented, dan menghasilkan trueamplitude angle gather. Disamping itu, metode ini dapat mengurangi efek artifactyang banyak terjadi pada metode migrasi menggunakan Kirchoff. Pada penelitianini dilakukan pemfokusan pada daerah sekitar patahan dengan perubahankecepatan yang cukup signifikan. Dilakukan variasi terhadap parameter CRAM,yaitu: Shooting angle, Aperture Migrasi, Dip ApertureFactor Migration,danKMAH index, untuk mendapatkan hasil pencitraan bawah permukaan yang palingbaik.
ABSTRACT
The migration process uses the angle domain provides subsurface imaging resultswere better compared to using conventional Kirchoff method which performed inthe offset domain. This migration apply in angle domainwith lateral velocityvariationto provide better imaging. Common Reflection Angle Migration(CRAM) prestack Depth Migration (PSDM) able to map the subsurface withincomplex geological structure, one of them is used foruncontinuityevents. Mappingthe subsurface and imaging as well as analysis of complex subsurface structures.In general, CRAM method overcome the conflicts mutiarrival case, using theprinciple of ray tracing and multiray path capable to image every point below thesurface of the raycomes from various directions towards the surface. CRAM canmap the subsurface layers or complex objects, target oriented, and produce trueamplitude angle gather. In addition, this method can reduce the artifact effectsthan Kirchoff method. In this research, focusing on the area around the fracturewith significant changes in velocity. This research proposed to perform a variationof the CRAM parameters may affected to obtain better imaging, such as:ShootingAngle, MigrationAperture, Dip Migration Aperture Factor, and KMAH index, The migration process uses the angle domain provides subsurface imaging resultswere better compared to using conventional Kirchoff method which performed inthe offset domain. This migration apply in angle domainwith lateral velocityvariationto provide better imaging. Common Reflection Angle Migration(CRAM) prestack Depth Migration (PSDM) able to map the subsurface withincomplex geological structure, one of them is used foruncontinuityevents. Mappingthe subsurface and imaging as well as analysis of complex subsurface structures.In general, CRAM method overcome the conflicts mutiarrival case, using theprinciple of ray tracing and multiray path capable to image every point below thesurface of the raycomes from various directions towards the surface. CRAM canmap the subsurface layers or complex objects, target oriented, and produce trueamplitude angle gather. In addition, this method can reduce the artifact effectsthan Kirchoff method. In this research, focusing on the area around the fracturewith significant changes in velocity. This research proposed to perform a variationof the CRAM parameters may affected to obtain better imaging, such as:ShootingAngle, MigrationAperture, Dip Migration Aperture Factor, and KMAH index] |
T43848-Amelina.pdf :: Unduh