GasFact™ data logging service helps operator confirm prognosed stratigraphy using isotopic data in real time.Download PDF
Confirm stratigraphy of complex subsalt formation in real time
Gulf of Mexico
An operator requested Halliburton Sperry Drilling provide GasFact™ data logging services for real-time well prognosis in the Gulf of Mexico (GOM) using stable carbon isotope ratio analysis. While exiting the base of salt, displaced cretaceous carbonates with a thermo-genetically mature carbon isotope signature were positioned over younger Miocene sandstones with an immature biogenic carbon isotope signature. These formations were followed by a shaly section with wet stringers and then the thermogenic mature reservoir. The Surface Data Logging (SDL) team recommended an isotopic gas analyzer paired with a flowline constant volume extractor (CVE), in combination with standard total hydrocarbon analysis (THA) and C1-C5 gas chromatography.
Reducing uncertainty in real time is necessary for potential hazard identification during drilling and reservoir characterization. The challenge in this case was to determine fluid origin while drilling through the following complex sections:
Data quality assurance was another concern, particularly when identifying drill-bit metamorphism, which can help optimize drilling activity and constrain gas data quality. The generation of ethylene and propylene gas caused by drill-bit metamorphism indicates high-temperature-induced cracking of drilling and formation fluid, which can affect the natural gas signature of formation fluid and make accurate analysis and interpretation difficult.
Global GasFact service support was provided for real-time, accurate carbon isotope data analysis of methane, ethane, and propane. The SDL team provided necessary hands-on procedural steps related to the CVE and GasFact analyzers at the wellsite. The operator’s petrophysics team provided a well prognosis.The GasFact service used the Baseline 8900 Gas Chromatograph (GC), Baseline 9000 Total Hydrocarbon Analyzers (THAs), and Compact Science Systems’ IsoLogger Mass Spectrometer (GC-C-IRMS) at the rigsite to provide analysis of a flowline gas-in-mud sample.The SDL team members monitored the GC for the presence of extra gas peaks between ethane and propane (ethylene peak) and between propane and isobutane (propylene peak) for drill-bit metamorphism identification.
The GasFact service-generated data analysis successfully identified different fluid type origins during the transition from older displaced Cretaceous carbonate overlying the younger Miocene formation—a thermogenic to biogenic signature—confirming the operator’s well prognosis expectations.
GasFact gas analysis service from Halliburton Sperry Drilling is a surface data logging service that combines the capabilities of the constant volume and temperature gas extraction
Drill Fact gives precise drilling measurements for enhanced decision-making and drilling performance.
Expand geological and petrophysical knowledge with Halliburton LithoFact® Advanced Cuttings Analysis Service.
Ready to take the next step?