APPLICATON OF GEOPHYSICAL WELL LOGGING TECHNOLOGY IN EXPLORATION OF GAS HYDRATE
Notice bibliographique
Résumé
Gas hydrate is a potential huge energy. The developed countries, such as United State, Japan and Russia, has done lots of researches in this area to detect the existence of gas hydrate and evaluate the reserves of it. Geophisical well logging has played a important role in the detection and evaluation of gas hydrate and along with the increase of wells drilling for explore the gas hydrate, more and more stress has been laid on well logging. Based on the present situation of poor research in this field in our country, this paper summarizes the application of geophysical well logging technology in the exploration of gas hydrate. Firstly, the techniques of qualitative identification and quantitative evaluation of porosity and saturation in the gas hydrate bearing reservoir by conventional well logging data are discussed detailedly. For the qualitative identification, on the log in a gas hydrate zone ,there is a relatively higher electricalresistivity deflection than that in a water saturated zone, a relatively lower SP deflection in gas hydrate bearing zone than that in free gas zone. And the caliper log in gas hydrate zone shows a characteristic with oversized borehole for the reason of gashydrate decomposition. There is a decrease in acoustic transit time in comparision to that in the water or free gas bearing horizon. In the neutron porosity and density log, they shows a slight increase and decrease respectively. For the quantitative evaluation, the porosity in the gas hydrate bearing reservoir can be determined from core analysis, density log, neutron porosity log and resistivity log, but the porosity from core ananlysis and resistivity log is more accurate than that from other two methods for the bad borehole condition. The saturation of gas hydrate can be calculated using standard Archie equation and a quicklook Archie analysis method.Secondly, carbon/oxygen spectral logging is a good method to quantitatively evaluate gas hydrate saturation. Two interpretation models of carbon/oxygen spectral logging for the gas hydrate bearing reservoir are presented. The first one is gas hydrate carbon/oxygen reservoir model,from which the ratio of between different elements and then the gas hydrate saturation can be derived.The second one is the complex carbon/oxygen reservoir model,in which the effects of borehole fluid and carbon in shale are considered.Thirdly,image logging responses at the gas hydrate bearing interval are introduced.During leg 164 of the Ocean Drilling Program, The FMS were used and produced a high resolution resistivity image, from which the existence of gas hydrate was proved. In addition, the FMI image was achieved in the Mackenzie delta of Canada ,from which the occurrence of gas hydrate also was inferred.Based on above summarization, the research strategy in this area for our country are presented.In view of the present situation, our country should cultivate young scholars in this field, and fund for the research in this area. In the aspect of technology, our country should enhance the research on the theory and experiment of every well logging responses, especially about calibration of bad borehole condition.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».