[ABSTRAK
Lapangan Y memiliki permasalahan kepasiran saat memproduksi hidrokarbon danhal ini mengakibatkan penurunan effesiensi pompa secara drastis. Permasalahankepasiran dapat diatasi dengan beberapa cara, seperti mekanikal (sand cat, gravelpack), kimia (Sand Aid) dan cara perforasi selektif (seleksi perforasi interval danperforasi berarah). Pemecahan permasalahan kepasiran dengan cara mekanik dankimia memerlukan biaya yang mahal. Pada tesis ini dilakukan pemecahanpermasalahan kepasiran dengan cara perforasi selektif ke arah tegasan horizontalmaksimum dan menghasilkan penurunan produksi pasir yang hampir sama dengancara mekanikal dan kimia serta dapat menekan biaya. Pada study ini digunakan 3 datalog image dan atribut seismik 3D untuk menentukan arah tegasan horizontalmaksimum.Pada 3 data log image dilakukan interpretasi arah rekahan, breakout, dan inducedfracture. Dari tiga data log image, dapat dilihat bahwa rekahan insitu stress memilikiarah tegasan horizontal maksimum yang hampir sama dengan tektonik stress. Arahtegasan horizontal maksimum yang dihasilkan log image adalah N 040o E ? N 220oE. Arah perforasi dapat dilakukan ke arah N 040o E ? N 220o E secara lokal areasekitar sumur yang memiliki data log image. Untuk melihat penyebaran arah rekahanlapangan Y dilakukan analisis atribut seismik. Metode analisis atribut seismik yangdigunakan adalah variance, ant track dan curvature. Metode atribut seismik variancedan ant track yang dianalogikan pola rekahan memiliki arah yang sama denganrekahan log image yaitu N 055o E ? N 095o E dan pola tidak berubah dari Utarahingga Selatan Lapangan Y, namun pola atribut curvature tidak memilikikecendrungan yang sama dengan arah lipatan hasil analisis rekahan log image.Karena kesamaan arah umum rekahan log image dengan kecendrungan rekahan padaatribut variance dan ant track, maka tegasan horizontal maksimum dari analisis logimage dapat digunakan dalam menentukan perforasi berarah sumur-sumur diLapangan Y yaitu N 040o E ? N 220o E.

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ABSTRACT

Y field has sanding problems when producing hydrocarbons and as it results in a

drastic efficiency decrease in pump. Sanding problems can be solved in several ways,

such as mechanical (sand cat, gravel pack), chemical (Sand Aid) and selective

perforation way (perforation interval selection and oriented perforation). Sanding

problems solved by means of mechanical and chemical but it costly. This thesis has

done by using selectively perforating in the direction of maximum horizontal stress to

solves the sanding problems and the result make production of sand decreased that is

almost the same as the mechanical and chemical way to reduce the cost. In this study

used 3 images data log and 3D seismic attributes to determine the direction of

maximum horizontal stress.

At 3 image log data has interpretated the direction of fracture, breakout and induced

fracture. At three image log data, the insitu stress fracture have a horizontal

maximum stress direction which direction same to tectonic stress. The direction of

horizontal maximum stress from image data was N 040o E - N 220o E. The orient

perforation can be used towards N 040o E - N 220o E which applied the local area

around the image data only. To know fractures direction deployment in Y field by

using seismic attribute analysis. Seismic attribute analysis method was used variance,

ant track and curvature. Method of seismic attribute variance and ant tracks were

analogued to the pattern of fractures in the same direction with a fracture log image

was N 055o E - N 095o E and the pattern has not changed from the North to the South

Y Field, but the pattern attribute curvature did not similar to the folds image log

fracture analyst. Due to the similarity direction of the image log fracture with the

attribute variance and ant track, so that the maximum horizontal stress of the image

log analysis can be used in determining the perforation directional in the Y Field that

was N 040o E - N 220o E., Y field has sanding problems when producing hydrocarbons and as it results in a

drastic efficiency decrease in pump. Sanding problems can be solved in several ways,

such as mechanical (sand cat, gravel pack), chemical (Sand Aid) and selective

perforation way (perforation interval selection and oriented perforation). Sanding

problems solved by means of mechanical and chemical but it costly. This thesis has

done by using selectively perforating in the direction of maximum horizontal stress to

solves the sanding problems and the result make production of sand decreased that is

almost the same as the mechanical and chemical way to reduce the cost. In this study

used 3 images data log and 3D seismic attributes to determine the direction of

maximum horizontal stress.

At 3 image log data has interpretated the direction of fracture, breakout and induced

fracture. At three image log data, the insitu stress fracture have a horizontal

maximum stress direction which direction same to tectonic stress. The direction of

horizontal maximum stress from image data was N 040o E - N 220o E. The orient

perforation can be used towards N 040o E - N 220o E which applied the local area

around the image data only. To know fractures direction deployment in Y field by

using seismic attribute analysis. Seismic attribute analysis method was used variance,

ant track and curvature. Method of seismic attribute variance and ant tracks were

analogued to the pattern of fractures in the same direction with a fracture log image

was N 055o E - N 095o E and the pattern has not changed from the North to the South

Y Field, but the pattern attribute curvature did not similar to the folds image log

fracture analyst. Due to the similarity direction of the image log fracture with the

attribute variance and ant track, so that the maximum horizontal stress of the image

log analysis can be used in determining the perforation directional in the Y Field that

was N 040o E - N 220o E.]