Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Tinnin, Beau; Hildred, Gemma; Martinez, Nahysa

doi:10.1190/urtec2013-123

Cited by 7 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years XRF, specifically its ability to differentiate numerous major and minor elements, has been used as a chemostratigraphic tool to predict TOC, paleoredox conditions, and overall stratigraphic "sweet spots" attributed to well deliverability (Rowe et al, 2009, Tinnin et al, 2013, Hashmy et al, 2012, Harbor, 2011. Under a similar methodology employed by Tinnin et al (2013), key redox sensitive trace elements were correlated against core and log derived reservoir parameters including: TOC, porosity, mineralogy, gas chemistry (gas wetness), and SRA outputs (HI,OI,S1, S1/TOC, and S2).…”

Section: Reservoir Characterizationmentioning

confidence: 99%

“…Under a similar methodology employed by Tinnin et al (2013), key redox sensitive trace elements were correlated against core and log derived reservoir parameters including: TOC, porosity, mineralogy, gas chemistry (gas wetness), and SRA outputs (HI,OI,S1, S1/TOC, and S2). Overall enrichment of V, Ni, Mo, and Zn are observed in the upper section of the Lower Eagle Ford, with Cu and Cr enrichment in the lower section of the Lower Eagle Ford (Figure 6).…”

Section: Reservoir Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

New Findings in Expected Ultimate Field Recoveries: Implications of Staggered Lateral Downspacing in the Eagle Ford Shale

Grossi¹,

Neumann²,

Lalehrokh³

2015

Unconventional Resources Technology Conference

View full text Add to dashboard Cite

The Eagle Ford Shale has emerged as one of the premier unconventional resources in North America. Explosive development has propelled the play to current volumes of 1700 Mbbls/day of oil and 7 bcf/day gas (EIA, March 2015). Despite this incredible achievement many operators are wanting more; utilizing innovative development strategies to enhance overall field recoveries. This strategy seems to be warranted given expected recoveries are typically low for an immense ultimate technically recoverable resource of 17 Tcf gas and 4.2 Bbbls oil (EIA, 2014). From these metrics it is clear to see that optimizing recovery can have dramatic and profound impacts; a conservative 5% recovery increase would yield an additional 1Tcf gas and 200 MMbbls oil.A systematic approach and associated findings in implementing optimized recovery methods by the use of multizone (staggered; chevron well pattern configuration) downspacing within the Eagle Ford development area will be presented. The approach will be outlined through the use of numerous datasets including: the review of public production data, published analogue data, decline curve analysis, reservoir modeling, wireline log datasets, buried array microseismic, and geochemical datasets. Current well results, including raw production volumes and rate transient analysis outputs, will be shown to be supporting predicted and modeled results.This study will bring forward new findings in the effectiveness of current hydraulic fracturing techniques in regards to reservoir drainage limits, expected ultimate field recoveries, and the implications to staggered downspacing. The success of current staggered tests is expected to have a significant impact on future drilling inventory and subsequent asset value, with potential field recoveries being increased by 4 to 7 times current field averages.

show abstract

Section: Reservoir Characterizationmentioning

confidence: 99%

Section: Reservoir Characterizationmentioning

confidence: 99%

New Findings in Expected Ultimate Field Recoveries: Implications of Staggered Lateral Downspacing in the Eagle Ford Shale

Grossi¹,

Neumann²,

Lalehrokh³

2015

Unconventional Resources Technology Conference

View full text Add to dashboard Cite

show abstract

“…In fluvial settings, the elemental data are typically used to recognize changes in paleoclimate (Pearce et al 2005, changes in sedimentary facies, and changes in sediment provenance (Ehrenberg and Siring 1992, Armstrong-Altrin et al 2004, Pe-Piper et al 2008, Hildred et al 2010, Ramkumar et al 2011. In shale resource plays, the elemental data are commonly used to recognize terrigenous material influx and content (Algeo et al 2004, Soua 2010, ver Straeten et al 2011, Whalen et al 2015 and as a proxy for bottom water conditions during deposition (Tribovillard et al 2006, Rowe et al 2012, Tinnin et al 2013). These changes are then used to build a stratigraphic framework and provide stratigraphic correlations.…”

Section: Introductionmentioning

confidence: 99%

Using Elemental Chemostratigraphy on Mid–Late Frasnian Platform-Top Successions from the Lennard Shelf Outcrops, Canning Basin, Western Australia

Ratcliffe¹,

Playton²,

Montgomery³

et al. 2017

New Advances in Devonian Carbonates: Outcrop Analogs, Reservoirs, and Chronostratigraphy

View full text Add to dashboard Cite

High-resolution chronostratigraphic correlation using elemental chemostratigraphy in platform carbonates is typically difficult to achieve. Here, elemental chemostratigraphy is used to correlate between two platform-top, carbonate-dominated field sections from the narrow Lennard Shelf that existed on the NE margin of the Canning Basin, Western Australia, during the mid-late Frasnian. The correlation, constrained by magnetic polarity reversals and physical ground truthing, is based on recognition of distinctive cyclical ''stacking patterns'' defined by changes in concentrations of the trace element zirconium (Zr). Zr concentrations are controlled by the amount of the heavy mineral zircon in the sediments, which is derived from a terrigenous source and is diagenetically very stable. The stacking patterns in the lower part of the study sections display gradually upward-increasing values of Zr to a maximum, followed by an almost immediate fall to a minimum. In the upper part of the study interval, the cycles are more symmetrical, with both gradually increasing and decreasing portions. The point at which the change in Zr stacking pattern occurs in the two sections is synchronous and occurs in association with a supersequence maximum flooding surface. The correlation based on maximum and minimum Zr values throughout the two sections is demonstrated to be chronostratigraphic by comparison with correlations based upon paleomagnetism and physical ground truthing.When element ratios commonly used as provenance and paleoclimate proxies are plotted, the variations between closely spaced samples are greater than any systematic variations throughout the study intervals. Therefore, no isochemical chemozones can be defined, implying that during deposition of the study intervals, there were no long-lived changes in sediment provenance or paleoclimate that the elemental chemistry can detect.The work presented here shows that the standard approach of defining isochemical chemozones for chemostratigraphic correlation is not always appropriate. However, an approach using cyclical changes in elemental variables for chemostratigraphic correlation between two closely spaced sections is chronostratigraphically valid. The greater challenge is in application of the same approach to more widely spaced sections, potentially in different facies of a carbonate setting.

show abstract

Regional assessment of the Eagle Ford Group of South Texas, USA: Insights from lithology, pore volume, water saturation, organic richness, and productivity correlations

et al. 2016

View full text Add to dashboard Cite

A comprehensive regional investigation of the Eagle Ford Shale linking productivity to porosity-thickness (PHIH), lithology ([Formula: see text]), pore volume (PHIT), organic matter (TOC), and water-saturation ([Formula: see text]) variations has not been presented to date. Therefore, isopach maps across the Eagle Ford Shale play west of the San Marcos Arch were constructed using thickness and log-calculated attributes such as TOC, [Formula: see text], [Formula: see text], and porosity to identify sweet spots and spatial distribution of these geologic characteristics that influence productivity in shale plays. The Upper Cretaceous Eagle Ford Shale in South Texas is an organic-rich, calcareous mudrock deposited during a second-order transgression of global sea level on a carbonate-dominated shelf updip from the older Sligo and Edwards (Stuart City) reef margins. Lithology and organic-matter deposition were controlled by fluvial input from the Woodbine delta in the northeast, upwelling along the Cretaceous shelf edge, and volcanic and clastic input from distant Laramide events to the north and west. Local oxygen minimum events along the South Texas margin contributed to the preservation of this organic-rich source rock related to the Cenomanian/Turonian global organic anoxic event (OAE2). Paleogeographic and deep-seated tectonic elements controlled the variations of lithology, amount and distribution of organic matter, and facies that have a profound impact on production quality. Petrophysical modeling was conducted to calculate total organic carbon, water saturation, lithology, and porosity of the Eagle Ford Group. Thickness maps, as well as PHIH maps, show multiple sweet spots across the study area. Components of the database were used as variables in kriging, and multivariate statistical analyses evaluated the impact of these variables on productivity. For example, TOC and clay volume ([Formula: see text]) show an inverse relationship that is related to production. Mapping petrophysical parameters across a play serves as a tool to predict geologic drivers of productivity across the Eagle Ford taking the geologic heterogeneity into account.

show abstract

Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Cited by 7 publications

References 5 publications

New Findings in Expected Ultimate Field Recoveries: Implications of Staggered Lateral Downspacing in the Eagle Ford Shale

New Findings in Expected Ultimate Field Recoveries: Implications of Staggered Lateral Downspacing in the Eagle Ford Shale

Using Elemental Chemostratigraphy on Mid–Late Frasnian Platform-Top Successions from the Lennard Shelf Outcrops, Canning Basin, Western Australia

Regional assessment of the Eagle Ford Group of South Texas, USA: Insights from lithology, pore volume, water saturation, organic richness, and productivity correlations

Contact Info

Product

Resources

About