Topic
Core plug
About: Core plug is a research topic. Over the lifetime, 113 publications have been published within this topic receiving 1059 citations.
Papers published on a yearly basis
Papers
TL;DR: In this paper, the authors used 3D models reconstructed from large rock specimens and found that the key control on reservoir quality is the connectivity and continuity of the sandstone and mudstone layers, which is the dominant control on the transition between productive (pay) and nonproductive (nonpay) heterolithic facies.
Abstract: Tidal sandstone reservoirs contain significant intervals of hydrocarbon-bearing heterolithic facies, characterized by the presence of tide-generated sedimentary structures such as flaser, wavy, and lenticular bedding (millimeter to centimeter sand-mud alternations). We have characterized the reservoir properties (sandstone connectivity, effective permeability, and displacement efficiency) of these facies using three-dimensional (3-D) models reconstructed directly from large rock specimens. The models are significantly larger than a core plug, but smaller than a typical reservoir model grid block. We find that the key control on reservoir quality is the connectivity and continuity of the sandstone and mudstone layers. If the sandstone layers form a connected network, they are likely to be productive even at low values of net-to-gross (about 0.30.5). This may explain why the productivity of low net-to-gross, heterolithic tidal sandstones is commonly underestimated or overlooked. Connectivity is the dominant control on the transition between productive (pay) and nonproductive (nonpay) heterolithic facies. However, connectivity is difficult to characterize because core plugs sampled from the subsurface are too small to capture connectivity, whereas two-dimensional outcrop measurements can significantly underestimate the true 3-D value. Our results suggest that core-plug measurements of permeability and displacement efficiency are unlikely to yield representative values at the scale of a reservoir model grid block because the connectivity and continuity of sandstone and mudstone layers varies significantly with length scale.
109 citations
TL;DR: In this article, a flow-through extraction method was proposed to extract core plugs while preserving the pore system of the sample, which can be used to characterize the composition of residual petroleums obtained from reservoir rock samples.
90 citations
TL;DR: In this article, a near-well-bore model of the lower part of the Jurassic Tilje Formation in the Heidrun Field is constructed to illustrate the application of these results to formation evaluation studies.
Abstract: Heterolithic lithofacies in the Jurassic Tilje Formation, offshore mid-Norway, consist of three components – sand, silt and mud intercalated at the centimetre scale – and are generally difficult to characterize petrophysically with core and wireline data. A near-wellbore model of the lower part of the Tilje Formation in the Heidrun Field is constructed to illustrate the application of these results to formation evaluation studies. The sedimentological model is developed by detailed parameterization of a cored well interval and the petrophysical properties are based on core plug data, taking into account sampling bias and length scale. The variation in petrophysical properties as a function of sample volume is examined by calculating the representative elementary volume. The sensitivity of the representative permeability values to the contrast between the three components is studied and gives a better understanding of the flow behaviour of this system. These results are used to rescale the core plug data to a representative value and thereby quantify the uncertainty associated with the wireline-based estimates of porosity and horizontal permeability and to give an improved estimate of the kv/kh ratio.
79 citations
TL;DR: In this paper, a method of fracture and vug characterization and automatic classification of rock type in a naturally fractured vuggy carbonate reservoir using X-ray computed tomography (CT) was presented.
60 citations
TL;DR: Gold-tube pyrolysis experiments were conducted on miniature core plugs and powdered rock from a bitumen-rich sample of Eagle Ford Shale to investigate the role of rock fabric in gas generation and expulsion during thermal maturation as discussed by the authors.
36 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2022 | 1 |
| 2021 | 3 |
| 2020 | 6 |
| 2019 | 11 |
| 2018 | 7 |
| 2017 | 11 |