Prawira, Gregorio Adri (2020) Integrasi Metode Laminated Sand Shale Analysis dan Dipmeter untuk Analisa Porositas, Saturasi Air dan Arah Lapisan Reservoir Sumur Eksplorasi di Lapangan Migas “B”. Other thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
03411540000020-Undergraduate_Thesis.pdf Download (3MB) | Preview |
Abstract
Thin bed reservoir adalah jenis reservoir yang memiliki laminasi lapisan pasir-serpih dengan ketebalan 0.5 ft dan arah perlapisan tertentu. Alat logging umumnya mempunyai resolusi 0.7-2 ft sehingga lapisan pasir tersebut tidak terdeteksi mengakibatkan nilai porositas terlalu rendah dan saturasi air lebih tinggi dari nilai sebenarnya. Oleh karena itu digunakan metode Laminated Sand Shale Analysis untuk mendeteksi porositas dan saturasi air lapisan pasir serta analisa dipmeter untuk mengetahui arah perlapisan thin bed reservoir. Penelitian dilakukan dengan analisis resistivitas vertikal-horisontal untuk mengetahui indikasi laminasi tipis pasir-serpih dan output-nya resistivitas pasir sebenarnya. Setelah itu dilakukan analisis Thomas-Steiber untuk mendapatkan volume laminasi serpih dan porositas clean sand. Kalkulasi saturasi air menggunakan metode Waxman-Smith yang dipengaruhi nilai Qv dan resistivitas pasir sebenarnya. Arah perlapisan diketahui dengan korelasi log respon mikroresistivitas kaki 1, 2, 3, 4 dan log azimuth kaki 1 dipmeter di zona indikasi laminasi. Korelasi tersebut menghasilkan azimuth lapisan dan dip. Hasil analisis LSSA menunjukkan sumur BGD, LGD dan NBD terdeteksi thin bed reservoir di kedalaman 2290 ft, 4250 ft, dan 4498-4516 ft. Metode LSSA juga terbukti dapat meningkatkan nilai porositas dan menurunkan nilai saturasi air di laminasi pasir-serpih. Hasil analisis juga menunjukkan bahwa besar separasi Rv >Rh tidak menentukan besar volume laminasi serpih. Hasil analisis dipmeter menunjukkan bahwa arah reservoir dominan Timur – Timur Laut dengan dip semakin dalam semakin miring namun setiap zona terdapat tren dip mendatar ke bawah. Ketidakaturan pada hasil interpretasi arah perlapisan dan dip dapat disebabkan karena persebaran structural shale.
=================================================================================================================================
Thin bed reservoir is a type of reservoir that has a sand-shale laminated layer with a thickness of 0.5 ft and a certain layer direction. Logging equipment generally has a 0.7-2 ft resolution so that the sand layer cannot be detected, resulted in lower porosity value and higher water saturation value than the actual value. Therefore, the Laminated Sand Shale Analysis method is used to detect porosity and water saturation of sand layer and dipmeter analysis to determine the direction of thin bed reservoir layer. This study was conducted with vertical-horizontal resistivity analysis to indicate thin sand-shale lamination and the actual sand resistivity output. After that, Thomas-Steiber analysis is carried out to obtain laminated shale volume and clean sand porosity. The water saturation calculation uses Waxman-Smith method which is affected by Qv value and the actual sand resistivity. The direction of the laminated layer is known by correlating microresistivity response log pad 1, 2, 3, 4 and azimuth log of pad 1 dipmeter in the indicated laminated zone. These correlations produce azimuth of laminated layers and dip. LSSA analysis detected thin bed reservoir in BGD, LGD and NBD wells in depth 2290 ft, 4250 ft, and 4498-4516 ft. LSSA method has been proven to increase porosity and decrease water saturation in laminated sand-shale. The analysis also shows that value of Rv>Rh separation does not determine the volume size of laminated shale. The dipmeter analysis show that the dominant azimuth of thin bed reservoir is East-North East with dip is more tilted at deeper zone, but each zone has a flattened downward dip. Irregularities in the bed azimuth and dip interpretation can be caused by the structural shale distribution.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSGf 550 Pra i-1 2020 |
| Uncontrolled Keywords: | Dipmeter, Laminated, Resistivitas, Thin Bed Reservoir |
| Subjects: | Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Gregorio Adri Prawira |
| Date Deposited: | 05 Dec 2024 05:20 |
| Last Modified: | 05 Dec 2024 05:20 |
| URI: | http://repository.its.ac.id/id/eprint/74134 |
Actions (login required)
 |
View Item |