Petroleum geology of Carboniferous volcanic weathered crust in northern Xinjiang, China
Bibliographic record
Abstract
Research Article| June 01, 2015 Petroleum geology of Carboniferous volcanic weathered crust in northern Xinjiang, China Lianhua Hou; Lianhua Hou PetroChina Research Institute of Petroleum, Exploration & Development, Beijing, China Search for other works by this author on: GSW Google Scholar Chun Yang; Chun Yang 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Search for other works by this author on: GSW Google Scholar Fan Yang; Fan Yang 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Search for other works by this author on: GSW Google Scholar Xia Lou; Xia Lou 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Search for other works by this author on: GSW Google Scholar Yanzhao Wei Yanzhao Wei 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Search for other works by this author on: GSW Google Scholar Author and Article Information Lianhua Hou PetroChina Research Institute of Petroleum, Exploration & Development, Beijing, China Chun Yang 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Fan Yang 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Xia Lou 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Yanzhao Wei 20 Xuyuan Road, Beijing 100083, P.R. China, Jinghong Wang Publisher: Canadian Society of Petroleum Geologists Received: 15 Jun 2014 Accepted: 11 May 2015 First Online: 12 Jul 2017 Online Issn: 2368-0261 Print Issn: 0007-4802 © the Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2015) 63 (2): 171–191. https://doi.org/10.2113/gscpgbull.63.2.171 Article history Received: 15 Jun 2014 Accepted: 11 May 2015 First Online: 12 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Lianhua Hou, Chun Yang, Fan Yang, Xia Lou, Yanzhao Wei; Petroleum geology of Carboniferous volcanic weathered crust in northern Xinjiang, China. Bulletin of Canadian Petroleum Geology 2015;; 63 (2): 171–191. doi: https://doi.org/10.2113/gscpgbull.63.2.171 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Previous studies on volcanic rock reservoirs were focused on lithology, lithofacies and fractures. Primary processes may lead to high porosity and permeability, and secondary processes tend to decrease primary porosity. However, this is not the case in northern Xinjiang, where Carboniferous volcanic rocks covered an area of 378×103 km2 dominated by intermediate-basic rocks of low porosity. At the end of the Carboniferous, these rocks were uplifted, underwent denudation and weathering, and then formed a weathered crust. All types of volcanic rocks might form favorable reservoirs after long-term weathering. The reservoir properties of the crust were controlled by weathering degree and fault development. Four types of reservoir porosity developed: dissolutional pore, pore-fracture, fracture and fracture-cave. Dissolutional pores and fractures are the main reservoir spaces. Under the influence of fractures and an enhanced fracture dissolution environment, the volcanic reservoirs have improved physical properties in deeper burial settings. The depth range of effective reservoirs under the unconformity, either close to, or far from fracture zones, is between 1100 m and 550 m, with maximum porosities of 32% and 24%, respectively. Hydrocarbons have accumulated close to the effective source rock zone due to strong heterogeneities of the volcanic reservoir. The overlying Carboniferous mudstone formed effective caprock. The current structural highs and slope zone coincided well with the paleogeomorphology and form traps for hydrocarbons. Faults and fractures control hydrocarbon enrichment. This is contrary to the view that the Carboniferous is simply impermeable basement in this region, and not capable of hydrocarbon generation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".