A review of the exploration potential of the Paleocene Lower Tanjung formation in the South Barito basin
Bibliographic record
Abstract
Abstract The Barito Basin, located in southern Kalimantan, consists of approximately 5000 meters of Cretaceous and Tertiary clastics with subordinate carbonates deposited in a passive margin setting. Middle to Late Miocene compression set up the present basin architecture. The basin is structurally subdivided by the Line: to the North a highly deformed zone dominated by reverse faulted anticlines; to the South a virtually 'undistrubed' sedimentary package gently dipping into the axis of the asymmetrical basin trough. The largest discovery in the basin to date is the Tanjung Field. The main productive sand is a basal transgressive unit, dated here as Lower Paleocene. About 800 MM bbls of oil (in place) have so far been discovered. The existing discoveries are restricted to the inverted area north of the Line. This study focused on the tectonically undisturbed southern part of the Barito Basin (South Barito Basin). The sequence stratigraphic model for the Tanjung Formation presented in this paper shows an alternative to the conventional stratigraphy, incorporating older Paleogene and Cretaceous sediments in the Lower Tanjung Formation (previously assigned to the Lower Eocene). The primary reservoir in the South Barito Basin is the basal transgressive sand of sequence-4 (63 Ma) which is equivalent to the Z860 sandstone in the Tanjung Field. The principal source rocks are coals and coaly claystone, containing Type III kerogens. Intraformational claystones associated with the maximum flooding surfaces of sequence-4 (Supersequence-2) act as the effective seal within the Tanjung Field and are also expected to provide the vertical seals in the study area.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.005 | 0.005 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".