Noras Nusantara collects, processes, analyze and interprets data related to the earth‟s surface and the soils and rocks beneath to provides advices based on the results to clients.
Our approach is straightforward, the best people, combined with the innovative application of leading edge ideas and technology. Noras Nusantara provides a wide range of services covering oil & gas, mining, water exploration services and also geotechnical investigation, survey and environment assessment services
Our oil & gas division provides services and products covering geological & surface geophysical (non-seismic) field survey, aerial survey, subsurface data analysis & interpretation, and surface geochemical exploration program for both onshore and offshore.Our consultants have proven track records and experiences of related services those bring added value, risk reduction and valuable insight to both exploration and development of oil & gas project, assisting our clients to meet their objectives.
Surface Geological Mapping & Sampling
Geological mapping is a cost-effective exploration tool and a project-generative process that delivers tangible benefits to all exploration programs. A good geological map not only provides focus to an exploration program, it also clearly communicates the economic potential of a project to stakeholders.
Structural mapping to define the architectural of rock
Detailed measuring section and stratigraphic analysis
Petroleum system identification
Provide guidance for seismic interpretation
Expertise in analytical support to solve specific issues (e.q. Petrography, alteration, fluid inclusions, porosity and permeability, gas contain, etc.)
Surface Geophysical Survey
Our company offers land based geophysical surveying and mapping solutions consist of :
Those methods are complimentary to seismic and useful for resolving complex geologic settings, better interpretation of existing data and improved imaging. It provides a low cost method of adding independent geophysics constraints to seismic processing techniques such as PSDM.
The geophysical data support;
cost-effective way to rapidly increase knowledge of sub-surface geology
linking areas of seismic and well coverage for regional picture
effective solution in areas with difficult exploration logistics
early stage assessment of project viability
Passive Seismic Tomography
Passive Seismic Tomography (PST) is a technique developed in the early 80s by K. Aki and students at MIT to image the subsurface of the earth. PST is similar to a CAT scan of the human body, but instead of using X-rays, we use the elastic waves generated by microearthquakes as our energy source. Microearthquakes occur anywhere in the earth where the background stress field has been perturbed even to a small degree such that data from a producing zone can be imaged from the surface using a well-designed seismic network.
PST products can be used for:
Define geological structures at depth
Locate possible hydrocarbon traps
Locate zones of low Vp/Vs indicating higher fluid filled regions like hydrothermal fluid (geothermal), hydrocarbon (oil and gas)
Reprocess 2D seismic lines for true depth
Critical aspects of our PST Technique :
We use an Eikonal Equation solver via Finite Difference calculations – VERY IMPORTANT to use a good ray tracing modeling software in PST.
PST is finding best fit velocities along the ray path from earthquake to receiver, and if ray tracing is wrong, then your model will be wrong!
Resolution tests are very important. Can your data resolve the structures in the target area and to what detail.
ISTI‟s Finite Difference ray tracer is the best approach to modeling complex velocity environments. We are inverting for velocity by looking at sensitivity/deviations along the ray path and if that is not modeled correctly using a good method, you will miss important details. Ray paths from stations (triangles) to earthquake (red dot). Note how rays bend in center along structure caused by fault.
Benefits PST surveys are:
Low impact on environment, stations have small footprint.
Stations can be solar powered in appropriate environments.
Easier to deploy because less permission is needed since PST stations are cable-less.
Able to cover a large area in detail
Able to go places where conventional seismic lines cannot (e.g. Mountains, region with difficult topography, region with surface weathered limestone etc.)
Less expensive than 2D – 3D conventional active seismic, smaller crew and fewer station deployments.
Have no societal impact since source of energy is passive
Able identify potential seismic hazards beneath target area.
Energy source is stronger and beneath the network, so PST can penetrate layers which are difficult for active seismic projects.
Anomalous Vp/Vs targets can be discovered and highlighted by PST.
Noras Nusantara collaborate with worldwide experience seismic and software company in USA namely Instrumental Software Technologies (ISTI) to help us with the deployment and data monitoring services. All the field work will be conducted by Noras Nusantara and supervised by ISTI. Data processing and monitoring will be held in ISTI‟s office in USA. Data interpretation, geology and geophysical model will be handle by Noras Nusantara and ISTI.
Surface Geochemical Exploration
Noras Nusantara has capability to conduct Surface Geochemical Exploration (SGE) at both onshore and offshore. We collaborate with international recognized surface geochemical exploration services companies those have proven and demonstrated method to deliver valuable geochemical insight to your exploration program.
Onshore Surface Geochemical Survey
Onshore surface geochemistry is a low-cost effective method for screening large exploration areas, prospect ranking, and development drilling in order to reduce exploration risk, localize seismic survey area and validate high-grade seismic anomalies,
“Do structures contain hydrocarbons or water ?”.
The analytical results combined with other geological and geophysical data can be a guideline to determine potential area in exploration and development of petroleum resources program.
Clients repeatedly use our geochemical and geophysical methods to:
Evaluate large areas to determine where to acquire leases, shoot seismic or drill
Determine if seismic anomalies contain oil, gas or water
Map reservoir trends (e.g. fluvial channels) for exploration or development drilling
Identify by-passed or deeper production
Define structural trends (e.g. faults and folds) to focus exploration
We collaborate with worldwide experience geochemical survey company in USA namely Geochemical Insight to help us with the high quality analytical services. All the sample will be conducted by Noras Nusantara and shipped to Geochemical Insight for analytical services. After completion of laboratory analysis our geoscientist conduct data analysis, interpretation and reporting of result.
Solid-phase Microextraction Method (HSPME, C5 to C20 range)
Synchronous Scan Fluorescence (SSF, C6 – C24 range)
Acid Extractable and ICP-ES-MS analysis
HTTD Soil Gas Hydrocarbons (C6 – C20) by GC/MS
Fixed Gas (He, H2, N2, Ar, Ne, O2, CO2, CO, H2S) by GC/MicroTCD
Biomarker and Isotope Analysis
Other geochemical analysis related to hydrocarbon sources.
Offshore Surface Geochemical Survey
Marine seabed surface geochemical exploration (SGE) surveys are based on the historical observation that upward migrated petroleum from deep source rocks and reservoirs can be analytically detected in near- surface sediments and conclusions can be used to help evaluate a prospective petroleum system. The interpretation of survey results is aided by robust and consistent analytical procedures over time, resulting in a growing knowledge by the geochemists of historical and geographic background levels of the analytes in petroleum play.
Marine seabed surface geochemical exploration (SGE) surveys typically consists of a set of sequential steps, as outlined below.
Core Site Selection
Seismic and/or multibeam surveys of the area of interest are used to select coring locations based on surface expression of faults, hardgrounds, mud volcanos, and other seabed features associated with upward migration of hydrocarbons.
Core Sample Acquisition
USBL-navigated piston coring is used to collect the precisely located core samples. Piston coring offers several advantages over gravity coring: greater penetration depths, better core recovery, and higher quality (less disturbed) samples. Using piston coring to sample depths up to 6 meters significantly reduces intracore variability due to bioturbation, loss by diffusion of gases, and mixing of natural hydrocarbon seepage or pollution in the top meter of sea floor sediments with deeper sections of the core
Core Sample Screening Analysis
Separate core section provided from every core are analyzed for headspace gases (C1-C5 plus CO2), total scanning fluorescence (measure of aromatic hydrocarbon content) and C15+Gas Chromatography (measure of aliphatic hydrocarbon content) to screen those samples for the presence of migrated thermogenic hydrocarbons.
Selected Sample Advance Analysis
Selected sample candidates that show promise based on one of the screening techniques are further analyzed for saturate and aromatic biological markers as well as for the stable carbon isotopic compositions of light hydrocarbon gas components.
These more detailed analyses can usually confirm the presence of migrated petroleum and are also often used to match hydrocarbons in the sediment extract with a specific produced oil and/or source rock, yielding information about age, maturity, depositional environment, and quality
The end product of an SGE survey is a listing of the acquired cores that display evidence of upward migrated thermogenic hydrocarbons
Our services covering :
Multibeam, backscatter and water column survey
Piston coring, seabed sample acquisition
Geochemical laboratory analysis, screening analysis and advance analysis
Interpretation and Reporting
To perform this survey we collaborate with worldwide experience offshore Surface Geochemical Exploration company in Texas, USA namely TDI Brooks to help us with the high quality seabedcore equipment, sample handling QA/QC, laboratory analysis and reporting & interpretation. We also collaborate with local shipping and multibeam equipment provider BPPT to support the vessel for the survey.
Noras Nusantara believe that properly planned and applied of aerial survey, can be a very efficient tool for directing an preliminary oil and gas exploration campaign. Aerial surveys were decided upon and initiated considerably later than the start of the geologic field work. In an unmapped or inadequately mapped area, an aerial survey has two aims:
Firstly to supply the topographic base for geologic mapping and geophysical surveys;
Secondly to supply a coherent structural picture to serve as a guide for the movements of geologic field parties engaged in stratigraphic studies and structural mapping
Noras Nusantara has capability to conduct aerial survey through drone survey by using LIDAR or aerial photography (orthomosaic) technology to produce 2D maps and also 3D digital elevation models then delivers a comprehensive interpretation of near-surface geology that increases confidence in modeling deeper geology.
Subsurface Data Analysis, Modeling and Interpretation
Noras nusantara provide full-spectrum, independent petroleum exploration consultancy related to subsurface data analysis, interpretation and modeling spanning geology, geophysics, petrophysics and geomodeling. Our geoscientist are able to perform :
Subsurface Data QA/QC
Well Log Correlation & Analysis
Seismic Interpretation and Subsurface Mapping
Facies analysis and mapping
Sedimentology and sequence stratigraphy
Petrophysical Analysis & Formation Evaluation
Petroleum system analysis
Prospect review and evaluation
We combined our strong understanding in geological concept, field-based knowledge (outcrop analogue model), industrial best practices and modern sophisticated software technology while conduct analysis & interpretation of subsurface data to deliver reliable and good quality result.
Noras Nusantara provides an integrated basin evaluation includes geohistory analysis, sedimentary environment modeling, basin modeling, and prospect evaluation.
Geohistory analysis will cover general regional tectonic review and structural reconstruction using palinspatic approach.
Sedimentary environment modeling in relation with geological structure evolution will be evaluated to build gross depositional environment model to provide better understanding of key petroleum system elements: source rock presence, trap, reservoir, and seal.
Basin modeling provides a comprehensive evaluation of the source rock presence, source rock properties, maturity and charge migration through time from kitchen to defined leads and prospects. It will also cover the modeling of compaction, pressure, heat flow and petroleum generation.
Our Basin Modeling approach including 1D, 2D and 3D Basin Modeling.
1D basin modeling analysis are used to estimate the thermal history and maturity timing, present day maturity, and compositional kinetics and simple expulsion concept to assess the nature of petroleum charge. 2D basin modeling analysis either in map or cross-section, can be used to reconstruct oil and gas generation, migration and accumulation along a cross section. 3D basin modeling comprises the evaluation of basin history, maturity of source rock, determining the effective petroleum kitchen, and modeling of the migration from the kitchen to the existing trap through time. It also includes calculation of potential hydrocarbon yield generated from the kitchen by using existing fields as calibration.
The result of geohistory analysis, sedimentary environment modeling and basin modeling will be utilized for the prospect maturation analysis to provide better lead and prospect inventory.