Geological Services

PT. Geoservices offers geological services covering a wide range of geological investigative survey at various map scales and well site geologist, in accordance with the geology and mining exploration objectives.

The objectives of geological mapping are to determine the location, attitude, and extend of the coal bearing strata, if not of the coal seams themselves, and the relation of these beds to other rock units in the area. Field mapping can also be used to reveal the nature and location of any igneous intrusions, faults, or other features that may affect seam continuity and mining condition.

Field geological mapping may cover general geological data, or may extend to detail structural, stratigraphic, lithologic, and mineralogical/petrological information. This data can also be used in drilling applications (e.g., pore pressure determination, rock strength calculations, and borehole stability analysis) and in geophysical applications (e.g., time-to-depth, seismic correlation, synthetic seismogram, and AVO analysis). The geological investigation and research start with an initial geological reconnaissance stage and extend to the most advanced stage of mineral, fuel and solid fuel resources/reserves exploration study.

Field work may include measurement of stratigraphic section and sedimentologic features, tectonic structures, and sampling (by pitting or augering if necessary) of rocks or other material for a variety of purposes: biostratigraphy, sedimentology, hard-rock and sedimentary petrography, petroleum or mineral geochemistry, geophysical properties, coal testing, geohydrology and geotechnics.

Our geologists have worked extensively in the resource industry with both small and large mining companies. We offer a strong background in natural resources such as metallic mineral, industrial mineral, coal and coal bed methane, and oil and gas exploration projects.  Project work has included detailed diamond drilling, surface and underground mapping, project research, data assessment, ore deposit modeling and resource estimation, and assessment of large scale open pit mining plans.  Our professional team has extensive experience with Surpac block modeling of Resources and Reserves, including specific experience with data validation, quality assurance and quality control, and technical reporting to Directorate General Mining of Public, Department of Mining and Energy standards.

Our Client:

PT. Broken Hill Pty. Indonesia, PN. Aneka Tambang, PT. Wall Mines, PT Sea Land Mining, PT. Dariskan Co., PT. Koba Tin, PT. Agnew Pty. Ltd., Ocean – Land Mining Ltd., PT. Gienco Ltd., PT. Wijaya Kusuma, PT. Tambang Timah, PT. Alcona Minerals of Indonesia, PT. Tambang Timah, CV. Berkat, PT. Wall Mines, A.A.R. Ltd., CV. Berkat, Arcadia Mineral  Ltd. Australia, PT. Berkat Indah Agung, PT. Semen Sulut Indah, PT. Kuyung Puring, Dominion Gold Indonesia, Gunung Lagadar, PT. Batubah Uya Mining, PT. Beis Tambangulang Mining, PT. Bumi Harum Sejahtera, PT. Indo Mining Karya Buana, PT. Indo Mining Karya Buana, Sampoerna Group, PT. Putra Bhakti Paramuda, PT. Sino Prosper Indocarbon, PT. Mentari Nusantara, PT. Megah Citra Utama, PT. Chandra Agung Inti Makmur, PT. Usaha Setia Bersama, PT. Pertamindo Utama, PT. Usaha Setia Bersama, PT. Yamabhumi Palaka, PT. Weco Dito Pratama, PT. Trieka Usaha Makmur, PT. Inter Cakrawala Tirta Indah, PT. Angglia Raksapati, PT. Inter Cakrawala Tirta Indah, PT. Modern Resources, PT. Celebes Hijau Pratama, PT. Sumber Tirta Persada, PT. Modern Resources, Alex Stewart (Malaysia) Sdn. Bhd., PT. Celebes Hijau Pratama, PT. Milenia Artha Prima, PT. Celebes Hijau Pratama, PT. Abimata Anugrah Abadi, PT. Tegar Alam Perkasa Konsultan, PT. Tambang Sungai Suir, PT. Hago Igur Energy, PT. Dua Rajawali Pro Energy, PT. Posco Resources Indonesia, Asia Mangan Group, PT. Zamin Indonesia, PT. Cahaya Duta Fajar, PT. Geomap Penajam, PT. Borneo Indobara, JPower, PT. Tekno Orbit Persada (TOP), United Telecom (Ltd.), Jade Commodities and Resources Pte. Ltd., PT. Adani Global, PT. Tambang Nusantara Perdana, PT. Indo Rak Resources (IRR), PT. Riau Bara Harum (RBH), Univest Limited, PT. Tamtama Perkasa, PT. Batubara Energy Indonesia, PT. Bangun Energy Indonesia, PT. Lamindo Inter Multikon, Conoco Indonesia, PT. Utah Indonesia, Amoco Indonesia, PT. Union Texas, PT. Union Texas, Pertamina, Conoco, British Petroleum, Repsol Exploration JOB., Conoco Warim, JOB Repsol Exploration, Union Texas Indonesia, Amoseas Indonesia, Canadian Oxy, Pertamina, PT. Arco Indonesia, Kufpec (Indonesia) Limited, PT. Merah, Chevron Indonesia Ventures, Chevron Indonesia Pacific, Chevron Indonesia Ventures LTD, PT. Solinter, Ditjend. Industri Kimia, CV. Makmur Jaya, Ditjend. Industri Kimia Dasar, PT. Distinct Indonesia Cement, PT. Bintang Puranesia, CV. Makmur Jaya, CV. Makmur Jaya, PT. Sement Sulut Indah, NV. Tijono Trading  Co., Pusat Pengembangan Tambang dan Mineral, Bandung, PT. Kayu Lapis Indonesia, PT. Semen Sulut Indah, PT. Dwi Capri Raya, PT. Semen Sugih Harapan, PT. Semen Sulut Indah, Ingold, Canarc, Dariskan, Analisa, Newmont, Dominion Gold, Riotinto, Koba Tin, Toyo Menka, Kaisha, the Teweti Group, Placer Development, Asthon Mercubuana Mining, Mugi Wira Pratama, Sungai Tembesi Minerals, Kota Besi Minerals, Sejahtera Mineral Indonesia, Tambang Tewah Perkasa, Berkat, Batubah Uya Mining, Beis Tambang-Ulang Mining, Natarang Mining, etc

PT. Geoservices has provided a quality service to the coal and minerals industry since 1971, including:

Mineral Exploration

PT GEOSERVICES has been involved in exploration for various metallic minerals, such as gold, base metals, tin, nickel, aluminum, manganese and iron. These projects initially involved regional and at a later stage detailed geochemical sampling, outcrop sampling and drilling. Concurrent with these activities geological mapping on a regional as well as a detailed scale, to cover the client’s entire Contract of Work Area, was carried out. At the time most areas outside Java were not yet systematically mapped.

GEOSERVICES well-equipped petrography laboratory provides full rock and mineral identification support to the field mapping teams and to drilling activities. The preparation of high quality thin-sections of all kind of lithologies, including vacuum impregnation prior to sectioning, and the preparation of polished blocks for the study of opaque minerals and coals, is routinely carried out. Colour photomicrographs of thin-sections and polished blocks can be provided.

Mineral Laboratory: Cikarang

Coal Exploration

GEOSERVICES together with CIC, from Australia, are capable of maturing a good coal prospect from its initial exploration stage, to delineation of quality and quantity, into a feasibility study.

We can provide the services of our own excellent and fully equipped coal-laboratory facilities in Bandung, Serang on Site, Paiton, Mojokerto on Site, Tanjung Redeb, Balikpapan, Palembang, Samarinda, Samarinda II, Banjarbaru, Padang, and Sangatta; in addition we have access to coal testing laboratory facilities in Australia

Petroleum Exploration

Participation in various stages of hydrocarbon exploration by GEOSERVICES started in 1977 in eastern Indonesia. In addition to offering the services of Indonesian geologists, from our own staff as well as those from professional associates, we are also in a position to recruit overseas specialists to meet our Clients’ requirements.

Geothermal Exploration

Next in importance as an energy source to oil, gas, and coal, is geothermal energy. GEOSERVICES participated in Pertamina’s geothermal exploration program from 1977 to 1996. Various studies by Pertamina, in which GEOSERVICES participated, included specific geological and geochemical mapping and evaluation, remote sensing studies, integrated with various types of geophysical exploration, “Petrex” fingerprint studies, well-siting, non-condensables, gas & steam/ hot-water monitoring, well and production testing, together with piping/valve maintenance.

Cement Raw Materials and Other Industrial Mineral Exploration

Demand for industrial minerals has shown tremendous yearly increases. This is especially the case for raw materials (limestone, clay and silica) for cement production, aggregate materials (mostly volcanic rock), sand, ornamental stone (marble and granite), feldspar, kaolinite, bentonite, zeolite, phosphate, various kinds of clay, etc.

Even though most of the demand for these kinds of services is on Java, especially West Java, other parts of Indonesia have been investigated. We have provided services to clients throughout the archipelago, from Aceh (the northernmost province of Sumatra), to West Sumatra, South Sumatra, West Kalimantan, South Kalimantan, Sulawesi and West Papua.

Wellsite geologist

Wellsite geologists study rock cuttings and core (mineral, core , CBM, oil and gas wells) to determine what rock formations are being drilled into and how drilling should proceed. They identify critical strata from core samples and rock-cutting data and build up knowledge of the structure being drilled.

They are experienced geologists, deciding when specialised tests should be carried out and, ultimately, when to stop drilling. They send reports and logs of completed drilling to the operations geologist and offer geological advice to oil company representatives. They also incorporate health and safety requirements in daily geological operations.

Wellsite geologists also liaise with drilling engineers, petroleum engineers and mudloggers during the course of projects.

Typical work activities

The work is based entirely on-site and usually involves the following:

  • Evaluating offset data before the start of drilling;
  • Analysing, evaluating and describing formations while drilling, using cuttings, gas, FEMWD (formation evaluation measurement while drilling) and wireline data;
  • Comparing data gathered during drilling with predictions made at the exploration stage;
  • Advising on drilling hazards and drilling bit optimisation;
  • Taking full responsibility for making decisions about suspending or continuing drilling;
  • Advising operations personnel on-site and in the operations office;
  • Supervising mudlogging, FEMWD and wireline services personnel and monitoring quality control in relation to these services;
  • Keeping detailed records, writing reports, completing daily, weekly and post-well reporting logs and sending these to appropriate departments;
  • Maintaining up-to-date knowledge of MWD (measuring while drilling) tools, such as gamma and resistivity;
  • Communicating regularly with onshore operations offices.

Who We Are

Founded in 1971 to offer services to the mining industry, PT Geoservices (Ltd) evolved into a fully integrated exploration services company. Employing more than 600 people, some of which are expert in specialized fields from a number of foreign countries, the company is offering in mapping surveys, geology, geophysics, downhole measurements, borehole drilling, laboratories analysis, and cargo superintending for quantity and quality.

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Our Location

Officesmall  Jl. Minangkabau Barat No.34 Jakarta Selatan 12970
Phonesmall  (+62 21) 830 5555, 831 8989
Faxsmall  (+62 21) 831 1454

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