Geowulf is a geological service company with over 30 years experience in petroleum geology, in both operational and well site geology as well as laboratory work. During this time over a thousand wells (or sections thereof) have been evaluated.
We specialize in:
High-resolution Optical Microscopy for Evaluation of Reservoirs
H.O.M.E.R is our new routine which enables the study of rock samples with an optical microscope at magnifications in the mid range of scanning electron microscopes. The results form the basis of understanding petrography and petrophysical properties. The objective is to fill in gaps left by traditional analyses and to solve remaining problems concerning reservoir characteristics.
Routine drill cuttings analyses
Traditional optical microscopy for stratigraphic purposes is used to solve doubtful stratigraphies and correlations.
Re-processing of historical well data makes historical data accessible and comparable with present day formats, thus enabling correlation with new wells.
High quality geological drafting is used in the support of geological studies and for reporting to government or partners.
HIGH RESOLUTION OPTICAL MICROSCOPY FOR THE EVALUATION OF RESERVOIRS
Present day stereo microscope technology enablees magnifications that previously were not available. Resolutions obtained can be compared to those of the mid range of scanning electron microscopy (SEM). After careful calibration against the results of more traditional analyses like SEM and XRD, we developed this new routine. With the Zeiss V20 we reach optical magnifications of up to 345 times with further digital zoom. Details down to 5 – 10μ can be easily recognized.
Using our new H.O.M.E.R. routine we produce an optically accurate 3D picture of the sample, in overview and in detail. Another advantage is that it can be used in a semi quantitative manner.
Main applications are the identification and semi-quantification of:
— macroporosity and microporosity
— connected and isolated macroporosity
— authigenic cements and diagenetic sequence
— residual oil and its relationship with diagenesis, especially in the case of a transitional Oil Water Contact.
Core samples should preferably originate from the locality of the plugs. The petrography can than be directly compared with the poroperm data. Additionally, the petrography found is compared with log derived parameters. Cuttings samples can also be used but then greater uncertainties have to be accepted.
EXAMPLES OF H.O.M.E.R IN PRACTICE
- homer 1
ROUTINE DRILL CUTTINGS ANALYSES
Routine re-study of the drill cuttings in relationship to the logs will reveal details that have been overlooked initially. Over time, most of the geological descriptions have been taken from the original mud log. These descriptions however are not produced as input for further study but for operational purposes and prior to the wireline logs. In the case of fast drilling there often is insufficient time to make an accurate description and crew changes may result in inconsistent reporting.
A detailed lithological breakdown which is related to the wireline logs, will result in meaningful and correlatable stratigraphic units and boundaries.
Our services include
— processing and study of drill cuttings samples
— identification of petrophysical features, for example explanation of ‘strange’ peaks
— recognition and distribution of minerals that influence wireline log measurements, for example glauconite or mica
— hidden lithologies behind poor quality Gamma Ray through casing
— detailed graphic representation related to the wireline logs
— correlation between wells
— recognition of faults
RE-PROCESSING OF HISTORICAL WELL DATA
The first exploration wells in an area are often those most used as a reference.
Re-processing and re-evaluating the available data matches them with later wells and facilitates correlation.
Prior to the drilling of a new well it is especially important to have a good set of off-set well logs.
Our services include
— construction of composite well logs displaying all geological and technical data
— construction of correlation panels at any desired scale and at any level
— re-study of cuttings and core samples if necessary
— high quality geological drafting
— the incorporation of all available data, such as handwritten bio-stratigraphical dating, blue prints of old logs, and drillers’ information
GEOWULFLaboratories, the Netherlands
04050205 Chamber of Commerce, the Hague
PO box 6
2270 AA Voorburg
Geowulf is owned by Chris de Klerk and Pauline de Bruijn