Jenis Mineral Lempung Endapan Kuarter Pantai Semarang Jawa Tengah dan Potensinya sebagai Lumpur Pemboran

Authors

  • Sugeng Widada Geological Engineering, Universitas Pembangunan Nasional "Veteran" Yogyakarta
  • Hanna Afifah Geological Engineering, Universitas Pembangunan Nasional "Veteran" Yogyakarta
  • Salatun Said Geological Engineering, Universitas Pembangunan Nasional "Veteran" Yogyakarta
  • Hendaryono Hendaryono Geological Engineering, Universitas Pembangunan Nasional "Veteran" Yogyakarta

DOI:

https://doi.org/10.30588/jo.v3i1.488

Keywords:

endapan kuater pantai semarang, mineral lempung, komposisi mineralogi, lumpur bor, quaternary deposit of semarang coast, clay minerals, texture, mineralogy compositions

Abstract

Penelitian ini bertujuan untuk mengetahui karakteristik litologi endapan Kuater Pantai Semarang yang meliputi komposisi mineralogi, distribusi serta potensinya sebagai bahan lumpur bor. Komposisi mineralogi ditentukan dengan menggunakan scanning electron microscope (SEM). Untuk mengetahui potensi sebagai lumpur bor ditentukan berdasarkan uji rheology dan filtration loss. Dari hasil analisis menunjukkan sedimen Kuater Pantai Semarang didominasi oleh endapan lempung dengan sedikit lanau pasiran yang terbentuk oleh proses pengendapan secara suspensi. Secara mineralogis, jenis mineral lempung yang dijumpai di daerah telitian sangat bervariasi. Dari analisis SEM menunjukkan jenis mineral lempung yang dijumpai antara lain kaolinit, illit dan campuran montmorilonit- illit. Berdasarkan hasil uji rheology menunjukkan pembacaan deal reading 600 RPM nilai yang dominan = 4, harga viskositas plastis = 1, nilai yield point = 2 dan nilai gel strength 10 menit = 1. Berdasarkan uji filtration loss menunjukkan volume air yang keluar rata-rata 188 ml, tebal kerak lumpur rata-rata 0,65 cm dan pH = 8. Berdasarkan uji rheology dan filtration loss dapat disimpulkan bahwa mineral lempung di daerah telitian tidak memenuhi kualifikasi untuk dipergunakan sebagai lumpur pemboran.

The objectives of this study are to identify lithological characteristics of the Quaternary Sediments in the Semarang Coast including mineralogical composition, distribution and its potency as drilling mud. Mineralogical composition is determined using scanning electron microscope (SEM). The potency as drilling mud is identified based on rheology and filtration loss tests. Based on this study shows that this sediment is predominantly composed of clay-size material with minor sandy silt-size grain deposited by suspension process. Mineralogically, there are some clay mineral type in the study area based on SEM analysis, they are kaolinite, illite and mixed montomorillonite-illite.Based on rheology test showed that the value of deal reading 600 RPM = 4, plastic viscosity = 1, yield point = 1 and gel strength at 10 minute = 1. Based on filtration loss showed the average volume expelled water = 188 ml, the average thickness of mud cake = 0.65 cm and pH = 8. Based on rheology and filtration loss tests can be concluded that clay sediment in the study area can not be used as mud drilling material.

References

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Hana Afifah, 2005. Analisis Mineral Lempung Pantai Kodya Semarang Untuk Lumpur Pemboran, Laporan Skripsi, Universitas Pembangunan Nasional "Veteran" Yogyakarta.

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Lummus, J.L . and Azzaz, J.J., 1986. Drilling Fluids Optimation, A Practical Field Approach, Penn-Well Publishing Co.

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Published

2019-06-21

How to Cite

Widada, S., Afifah, H., Said, S., & Hendaryono, H. (2019). Jenis Mineral Lempung Endapan Kuarter Pantai Semarang Jawa Tengah dan Potensinya sebagai Lumpur Pemboran. Jurnal Offshore: Oil, Production Facilities and Renewable Energy, 3(1), 1–10. https://doi.org/10.30588/jo.v3i1.488

Issue

Vol. 3 No. 1 (2019): Jurnal Offshore : Oil, Production Facilities and Renewable Energy

Section

Articles

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