Posted Thursday March 23rd, 2017, 2:41 pm
2nd – 5th April 2017 - George R Brown Convention Centre, Houston
Come by and see us at Booth #2016 in the exhibition hall and hear about our new unconventional workflows. We rapidly and cost effectively place mineralogy, TOC, RHOB and porosity into a high resolution stratigraphic framework around and between pads. This is done by cuttings analysis from each lateral well you drill.
We are presenting 3 Papers at the show. Click here to download the abstracts: AAPG2017 Abstracts
Posted Thursday March 24th, 2016, 9:29 am
Chemostrat have developed new products aimed squarely at improving success and reducing costs in unconventional plays. The products take elemental, mineralogical and TOC data acquired from cuttings samples in lateral wells and translate them into rock mechanics properties (YM,PR), gamma API values, sonic values (DTC, DTS) and porosity. These variables are key to understanding unconventional reservoirs and we can provide them quickly and cost effectively at the well-site or as hotshots in our laboratories.
The aim of our products is to impact drilling and completions by providing data that would otherwise require downhole logging, or simply not be available in a timeframe to impact decisions.
Portable mineral, TOC and elemental analysers form the basis for our shale play services, complimented by our unique lab-based chronostratigraphic 13Corg service. Our instruments are truly portable and require no more than desk-space and power. Data can be gathered real-time at the well head or as a post drill hotshot service with results available within days and prior to completions.
Our XRF-based elemental analysers are 100% non-destructive and require no cuttings preparation beyond a rig-site lith wash. This means our service fast and cost effective, but still provides high quality data.
Our IR-based mineral and TOC analysers require <1g of powdered sample and analysis takes c. 30seconds to produce mineralogy and TOC. This means our mineralogy and TOC service is unrivalled for speed and cost effectiveness.
Our lab-based 13Corg service provides chronostratigraphic information on a basin wide to lateral well scale from core and cuttings analysis that have TOC>0.5%. In unconventional plays the cost effective, rapid capability of this service means it is a better option for correlation than biostratigraphy.
* Elemental data (wt % major element oxides and ppm trace element concentrations)
* Mineral data (quartz, total carbonate (with indicative dolomite) illite-smectite, chlorite, kaolinite and pyrite)
* Total Organic Carbon (weight %TOC)
* Mineral facies, Youngs Modulus (YM), Poisson’s Ration (PR), Sonic shear and compressive (DTC, DTS), Gamma API values, matrix density and porosity for each sample analysed.
Posted Monday July 13th, 2015, 10:12 am
An independent, regional chemostratigraphic correlation has been constructed for the Cretaceous and Jurassic successions penetrated by offshore wells from across the Grand Banks area and includes key exploration wells from the: Orphan, Flemish Pass, Jeanne d’Arc and Carson basins, in addition to wells from the Outer Ridge Complex. Geochemical data have been collected via ICP instruments from a total of 28 wells, with a further 24 wells currently under investigation (data available from early September, 2015).
Cuttings samples were collected from base Tertiary through to TD, with a focus on the Jurassic and Cretaceous successions and includes the organic-rich source rock intervals of the Rankin Formation and the prolific, syn-rift sandstones of the Jeanne d’Arc, Fortune Bay, Hibernia and Avalon units. An independent chemostratigraphic correlation, comprising first, second and third-order chemostratigraphic divisions, was developed across the study area and integrated, where possible, with existing lithostratigraphic and biostratigraphic data, providing a high resolution stratigraphic framework with which to calibrate wireline and seismic based correlations. The chemostratigraphic correlation is based on up-sequence variations in key elements and elemental ratios reflecting changes in lithology, clay mineralogy, heavy mineral and feldspar assemblages and organic matter preservation. Furthermore, spatial variations in these mineral phases allows for inferences to be made regarding sediment input and organic preservation.
The elemental data used to produce the chemostratigraphic zonations and correlations have been further utilised to calculate mineralogy (ChemMin) and TOC over the well sections. The predicted mineralogy was calibrated against a sub-set of XRD data to provide a tailored and high-resolution mineralogical model across the entire Grand Banks area, utilising a fraction of the XRD analyses that would otherwise be required. The resultant mineralogical logs provide a strong visual summary of the bulk mineralogy across the analysed successions in each well, as well as providing a means of quickly assessing which minerals principally control the E-log responses. Although the geochemical data acquired is inorganic in nature, there are elements within the dataset that can be associated with organic material, for example U, Mo and Ni. Using the same principals developed for the mineral modelling described above, it was possible to estimate relative TOC abundance using elemental proxies, with this data being further supplemented and calibrated with acquired TOC data.
In addition to the extensive Grand Banks dataset, geochemical data have been acquired from the nearby Hopedale and Saglek basins (offshore Labrador) and Scotian Margin (including the Scotian Shelf and Scotian Slope) with a total of 24 wells being analysed to date.
Wells can be purchased individually or as area parcels. The data and interpretations are presented in a GIS-based data package which includes raw data (.xls, .csv), tabulated tops, key figures, chemical maps and study report – AVAILABLE NOW. Further details on the study can be found here.
Posted Tuesday May 26th, 2015, 2:35 pm
A robust regional chemostratigraphic correlation has been constructed for the Namurian to Westphalian successions penetrated by onshore wells within the Gainsborough Trough, Edale Basin, East Midlands Shelf, Humber Basin, Askern-Spital High, Cleveland Basin, Bowland and Blacon Basin. A total of 36 wells from the UK onshore Carboniferous have been analysed with full ICP data, XRD, TOC, δ13Corg stable isotope analysis and palynological data. However due to limited sample volume some wells have had elemental data acquired by a calibrated handheld XRF, while a calibrated FTIR has been used to determine whole rock mineralogy.
This study focuses on the informally named ‘Bowland-Hodder unit’, typically, a high gamma ray interval located above Dinantian aged strata. This succession consists of silty claystones and siltstones that are distributed across northern England. Sandstones are localised and are thought to be associated with the progradation of deltaic systems from the North East. High calcareous lithologies are associated with the occurrence of the carbonate platforms, and the calcareous turbidite deposits derived from them. The study intervals have been subdivided into a series of chemostratigraphic sequences, and packages, on the changes in key elements and ratios based on lithology, heavy minerals, organic matter and clay minerals/feldspars. A high resolution stratigraphic framework that can used to calibrate wireline and seismic based correlations.
The elemental data used to erect the chemostratigraphic zonation and correlation have been used to predict the mineralogy (ChemMin) of all the analysed samples, allowing the construction of the mineralogical logs. The predicted mineralogy is calibrated against the sub set of XRD mineralogical data. This approach is advantageous as it converts the elemental data into minerals proportions, which are easily understood by geologists. In addition, mineralogical logs can be used to calibrate mineralogical models established by petrophysicists from E-log responses; as well as providing a relative brittleness index (ChemRBI). Using ChemMin mineralogical logs can be rapidly acquired from geochemical datasets from large numbers of samples and wells. Unlike XRD, which can vary from contractors, are typically time consuming and expensive. The logs provide a strong visual summary of the bulk mineralogy of the analysed successions in each well, as well as providing a means of quickly assessing which minerals principally control the E-log responses.
Redox conditions have also been determined using inorganic elemental datasets and TOC data. U, Mo, Cr, Co, Ni, Cu and S, Zn are potentially useful for highlighting variations in redox conditions (Tribovillard et al. 2006) as they are more soluble under oxidising conditions and less soluble under reducing conditions.
Chemostrat have already used the chemostratigraphic zonation from this study to provide offset well control for a wellsite chemostratigraphy deployment in the Bowland play.
Posted Thursday May 7th, 2015, 12:28 pm
Chemostrat has built an unrivalled reputation for providing and interpreting the highest quality laboratory data over the past quarter of a century.
We have worked in most basins around the world, providing elemental, mineralogical, isotopic and organic geochemical data and interpreting those data to deliver meaningful stratigraphic correlations. We have also carried out numerous studies in many North American shale plays, implementing not only high-resolution stratigraphic analysis, but a full array of Shale Solutions. With our wellsite services we are bringing this experience to wellsite as well as using state-of-the art instrumentation to provide inorganic whole rock geochemical data, mineralogical data and magnetic susceptibility data.
Our elemental data are collected using small compact XRF instruments that require minimal sample preparation (no heavy cumbersome pellet press required), yet yield data of a quality similar to that of larger instruments in a matter of minutes.
Our mineralogical data are collected using highly portable Fourier transform infrared (FTIR) instruments which determines bulk mineralogy and TOC indication from small samples in minutes. Magnetic susceptibility data provides detection of magnetic minerals to aid in the identification of sequence stratigraphic boundaries.
According to John Martin, Director for Chemostrat wellsite, “The new wellsite website will provide an informative user experience for our clients. As an integral part of our ambitious growth plans for the next three years, we recognised that we needed to develop a brand in line with the aspirations of the company. We needed a strong, new identity that communicates the message that we offer far more than chemostratigraphy to clients worldwide. Simplified site navigation and enhanced search capability” John continued “make it quick and easy for the visitor to find the appropriate service to suit their needs.”