Job title: Operations/ Wellsite Geologist

Reporting to: Subsurface Manager

Job Family: Subsurface (SS)

Location: Field based position

Job Ref No. PD/SS/OPWG/2026

Job Summary

Provide on-site geological support and supervision during drilling, coring, logging, and well operations, ensuring accurate formation evaluation, real-time lithological interpretation, and effective sample management. Deliver timely geological inputs to support safe and efficient well construction, reservoir characterization, and accurate subsurface data capture.

Key Responsibilities

• Provide company representation and wellsite geological supervision during drilling, coring, sampling, and logging operations, acting as the primary technical representative for geological activities on site.
• Perform real-time lithological and stratigraphic interpretation of cuttings, cores, and LWD/wireline logs to identify formation tops, reservoir targets, fluid contacts, and hydrocarbon shows.
• Advise drilling and logging teams on sampling strategies, coring intervals, logging programs, logging runs, and mitigation of hole condition challenges such as washouts and gas shows.
• Collect, label, preserve, track, and manage core, sidewall, and mud samples, ensuring chain of custody, quality control, and timely transfer to laboratories.
• Record, validate, and quality-control geological observations, mud log data, gas shows, and wellsite measurements, and prepare accurate wellsite geological reports, pick lists, and handover notes.
• Interface with petrophysics, reservoir, geophysics, and drilling teams to integrate core and log data, calibrate interpretations, and update subsurface geological models.
• Maintain data quality and metadata completeness for all geological datasets, ensuring timely submission to corporate subsurface data management systems.
• Provide geological input to operational decisions including drill/hold/casing points, landing zone recommendations, well trajectory adjustments, and coring or sidewall sampling decisions based on real-time observations.
• Participate in pre-job planning, HAZID/HAZOP studies, and pre-spud meetings by identifying geological hazards and recommending appropriate mitigation measures.
• Ensure compliance with HSE standards and permit-to-work requirements during geological operations, including safe handling of samples and logging tools, and conduct toolbox talks where required.
• Train and mentor junior field geology personnel and provide guidance to rig crews on sampling techniques, geological recognition, and reporting standards.
• Capture lessons learned and contribute to post-job geological summaries, formation evaluation reports, and continuous improvement initiatives.

Qualifications

• Degree in Geology, Earth Sciences, or a related discipline.
• Minimum of 5 years' relevant experience in wellsite or operations geology, with prior field experience in drilling, coring, and logging operations highly desirable.

Technical Skills & Knowledge

• Strong practical skills in core and cuttings description, stratigraphic interpretation, and basic sedimentology.
• Competence in interpreting LWD/wireline logs, mud logging data, and basic petrophysical outputs, with the ability to integrate multiple geological data sources.
• Proficiency in wellsite reporting systems, sample tracking processes, subsurface software (e.g., Petrel and other wellsite platforms), and good geological data management practices.
• Knowledge of sample handling, core preservation, laboratory testing requirements, and geological metadata standards.
• Sound understanding of drilling operations, rig terminology, casing programs, and basic well control principles.

Behavioural & Interpersonal Skills

• Strong observational skills, attention to detail, and a methodical approach to data recording and quality control.
• Clear and effective communicator, able to liaise with drilling crews, petrophysics and reservoir teams, and present concise wellsite updates to multidisciplinary stakeholders.
• Decisive and composed under pressure, with sound operational judgement and the ability to support critical wellsite decisions.
  • Team player, adaptable to shift work and remote living; culturally aware and able to work in multi‑disciplinary teams.

Experience & Conditions

• Proven experience working on wellsites or in operations geology roles in onshore or offshore environments.
• Willingness to work rotational shifts in remote camps, including extended hours during critical operations.
• Ability to perform physical tasks associated with sampling and core handling in field conditions.

Performance Indicators

• Accuracy and timeliness of wellsite geological picks, reports and sample delivery.
• Quality and completeness of geological data and metadata submitted to subsurface systems.
• Contribution to reduced drilling risk through timely geological input (corrected landing depths, casing decisions).
• Effectiveness of geological input in reducing drilling risk and informing casing/landing decisions.
• Number and impact of formation evaluation issues identified and resolved at site.
• Compliance with HSE procedures and incident/near‑miss rates related to geological activities.

Desirable

• Field geology, core description courses or logging‑while‑drilling experience.
• Familiarity with formation testing, geochemical sampling protocols, and the fundamentals of Cement Bond Log/Variable Density Log (CBL/VDL) interpretation.
• Familiarity with geochemical/formation testing sampling protocols and CBL/VDL basics.

Experience in integrated operations or real‑time data