Comparison of Methods for the Determination of the Pore System of a Potential German Gas Shale

Kaufhold, S.; Grathoff, G.; Halisch, M.; Plötze, M.; Kus, J.; Ufer, K.; Dohrmann, R.; Ladage, S.; Ostertag-Henning, Ch.

doi:10.1346/cms-wls-21-13

Cited by 1 publication

(2 citation statements)

References 41 publications

(51 reference statements)

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“…We here attribute this to the exsolution of gaseous hydrocarbons during the secondary thermal cracking of retained oil and conversion of oil to solid bitumen followed by thermal cracking of bitumen to form porous pyrobitumen . It has been shown previously that the different thermal maturity Posidonia samples are characterized by similar mineral compositions but different mineral abundance, which is caused by dissolution and precipitation of minerals as a function of thermal maturity . For instance, dissolution and illitisation of kaolinite can decrease micro- and mesopore volumes in the gas window maturity interval .…”

Section: Discussionmentioning

confidence: 85%

“…35 It has been shown previously that the different thermal maturity Posidonia samples are characterized by similar mineral compositions but different mineral abundance, which is caused by dissolution and precipitation of minerals as a function of thermal maturity. 88 For instance, dissolution and illitisation of kaolinite can decrease micro-and mesopore volumes in the gas window maturity interval. 48 In addition, the low micro-and mesoporosities of the two lowmaturity samples might be attributed to the cementation of coccolith canals and foraminifera cavities with calcite.…”

Section: Porosity Development In Organic-rich Mudrocks (Orms)mentioning

confidence: 99%

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Evolution of Pore Structure in Organic-Lean and Organic-Rich Mudrocks

Rezaeyan,

Kampman,

Pipich

et al. 2023

Energy Fuels

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The pore structure of mudrocks is a key characteristic to evaluate flow behavior through these rocks. Although significant advances have been made to resolve pore characteristics, porosity evolution, or pore connectivity, there is still insufficient knowledge linking porosity evolution to flow and transport in mudrocks. To better understand these links, we conducted very small-angle (VSANS) and small-angle neutron scattering (SANS) experiments on 13 sets of mudrocks from global locations, characterized by differences in composition, maturity, and depositional environment.Our results indicate that a homogeneous pore structure reflects a stable and low-energy depositional environment. Organic-lean mudrocks mainly contain pores <10 nm, which restricts flow and is beneficial for, e.g., caprock seal integrity. Increasing maturity as a result of increasing burial depth, and therefore, temperature leads to porosity evolution. In organic-rich mudrocks (ORMs), this happens through the generation of organic matter pores and pore preservation around diagenetically formed carbonates. ORMs mainly contain macropores (>50 nm), favoring production from, e.g., unconventional reservoirs. SANS-derived pore size distributions will help to better understand fluid imbibition and flow properties in mudrocks through comprehensive quantitative characterization of the nano-to micron scale pore network conduits and their relationships to burial diagenesis.

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Section: Discussionmentioning

confidence: 85%

Section: Porosity Development In Organic-rich Mudrocks (Orms)mentioning

confidence: 99%