Impact of CO2 influx on sandstone reservoir quality: A case study of the Quantou Formation, southern Songliao Basin, China
Bibliographic record
Abstract
ABSTRACT The CO2-gas reservoirs have been recorded in many petroliferous basins worldwide. However, the impact of deep inorganic CO2 influx on reservoir quality has received little attention. Here, a new set of mineralogical and geochemical data collected from the Lower Cretaceous Quantou Formation sandstones in the southern Songliao Basin are presented to address this issue. The sandstones were broadly subdivided into two zones based on their mineralogical compositions: (1) a normal zone with higher porosity (average 13.7%) and permeability (average 3.27 md) that is located >10 km from the Gudian fault (composed of ferrocalcite, ankerite, quartz, mixed-layer illite/smectite (I/S), kaolinite, illite, and chlorite); and (2) a dawsonite-bearing zone with relatively poor reservoir quality (average 10.1% and 0.4 md) adjacent to the Gudian fault (consisting of dawsonite, ankerite, quartz, I/S, and illite). The carbon sources for dawsonite and ankerite in the dawsonite-bearing zone (δ13C = −5.7‰ to −0.8‰ and δ18O = −20.6‰ to −17.1‰, and Sr = 0.710216–0.712472) are mostly a mix of mantle magmatic CO2 and crustal CO2, with a small amount of organic CO2, which is the opposite of that for the ferrocalcite and ankerite in the normal zone (δ13C = −10.5‰ to −2.3‰, δ18O = −19.3‰ to −14.9‰, and Sr = 0.712060–0.714030). Observations of the dawsonite-bearing zone demonstrate higher contents of carbonate and quartz cements, specific clay mineral types (mixed-layer I/S with Reichweite order of R = 3 and illite), and poor reservoir quality and oil productivity due to the influx of deep inorganic CO2 dating to circa 65–44 Ma.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".