Subrahmanyam Pachineelam

• Upstream oil and gas domain consultant and Product Owner with Tata Consultancy for TotalEnergies, France.
• Responsible for the scientific development and maintenance of clients' in-house petrophysical and reservoir modeling software applications.
• Involved in developing machine learning (ML) models, focusing on capturing multiscale, textural-driven permeability predictions of carbonate reservoirs from high-resolution ultrasonic borehole image logs.
• Product ownership and Agile project delivery involve understanding the vision and objectives of the application, as well as business requirements in consultation with users and stakeholders, in order to deliver tailored solutions to support digital transformation initiatives.

As a Senior Petrophysicist, I deliver advanced petrophysical evaluations across clastic, tight, and unconventional reservoirs. Expertise in integrating multi-scale datasets from high-resolution core measurements to advanced logging suites (sonic scanners, NMR, FMI image logs) to deliver rock typing, facies modeling, saturation height models, and reservoir property calibration for static and dynamic modeling.

Key technical competencies include:

• Log data acquisition planning, QC, and real-time monitoring.
• Advanced formation evaluation and multi-well reservoir studies to characterize reservoir properties and support field development planning.
• Core–log integration, SHM, and permeability modeling.
• NMR, image, and sonic data processing (STC method for P&S waves).
• Plan and execute RCA and SCAL programs with full integration into petrophysical and geomechanical models for accurate reservoir characterization.
• Build and execute hydraulic fracture and geomechanical models to analyze fracture growth, well/cluster spacing, drainage height, and FDIs.
• Cased-hole log evaluation (e.g., Cement Bond Logs, RSTs, PLTs) is conducted to assess well integrity, fluid saturation, and production behavior.
• Identify and implement production enhancement opportunities in mature fields to maximize recovery.
• Demonstrated leadership and mentoring in multidisciplinary technical teams.
• Manage stakeholder relationships with joint venture partners and regulatory authorities to ensure compliance and project alignment.

• Focused on wellsite geological operations in various onshore and offshore assets
• Focal point for pre-drill, real-time pore pressure prediction of HPHT exploratory wells in challenging drilling environments.
• Collaborated with the subsurface team and built Mechanical Earth Models (MEM) to assess formation stress anisotropy and wellbore stability models (WBS), which help evaluate drilling feasibility and potential risks in complex environments.
• Auditing, calibration, and checking the MWD/LWD, geosteering, mud logging, and wireline tools prior to operation.
• Real-time monitoring of geological and drilling parameters, and interpretation
• Mitigation of risk and improvement of safety and operational performance during the various open hole, cased hole, conventional coring, and MDT sampling operations.

• Expertise in oil and gas exploration, focusing on sedimentary basin evolution, tectonic history, depositional settings, and stratigraphic sequences to contextualize exploration prospects effectively.
• Ability to assess exploration risks and uncertainties, adept at addressing challenges in seismic interpretation, employing creative problem-solving approaches, ensuring accuracy and reliability in geological assessment.
• Ensure compliance with regulatory requirements and environmental regulations governing exploration activities, including obtaining permits and approvals.
• Planning and coordinating exploration programs, including defining exploration priorities, releasing drilling locations, staking, and drilling.
• Experienced in diverse basins worldwide: Cambay and KG (India), Jeza-Qamar (Yemen), Basilam (Indonesia), Sudalpur and Kasba (Bangladesh), Gasha and Shelli (Russia), etc.

• Monitor and analyze drilling data, including cuttings, mud logs, and gas readings, in real time to identify lithology changes, formation tops, and potential hydrocarbon shows.
• Detect and evaluate hydrocarbon shows during drilling operations, including gas kicks, oil stains, and fluorescence, to assess reservoir quality and potential production zones.
• Communicate geological findings, drilling updates, and wellsite activities to multidisciplinary teams, including drilling engineers and the subsurface team, to support decision-making processes.
• Provide geological input to optimize drilling parameters, including well trajectory, casing design, and drilling fluid properties, to minimize drilling risks and maximize well productivity.
• Identify and mitigate geological risks associated with drilling operations, such as wellbore stability issues, pore pressure anomalies, and formation damage, to ensure safe and efficient drilling.