| PDF: | |
| Time: | 2006 |
| Journal: | Journal of Jilin University(Earth Science Edition) |
| Volumn: | 36 |
| Issue: | 5 |
| Pages: | 805-812 |
| Type: | Other |
| Author: | Pujun Wang,Heyong Wu,Yanming Pang,Guangtian Men,Yanguang Ren,Wanzhu Liu,Weihua Bian |
Abstract: | Facies sequence of volcanic rocks is predominantly controlled by lithotypes in the Songliao Basin. Acidic eruption cycles generally begin with explosive facies and end with extrusive facies. Andesitic/basaltic eruption cycles usually begin with effusive facies and end with volcanogenitic sedimentary facies. Interbeded acidic-intermediate-basic volcanic eruption cycles have complex facies sequence ge-nerally from effusive facies through explosive facies to volcanogenitic sedimentary facies. Weathered crust and sedimentary intercalation are indicative of volcanic intervals. Extrusive and volcanogenitic sedimentary facies are the end-members of an eruption cycle. Facies model described here has been effectively used in seismo-reservoir interpretation in the gas field of volcanic rocks of the Songliao Basin. Only four of the 15 volcanic sub-facies can form high-quality volcanic reservoirs, which include volcanic neck, pyroclastic-bearing lava flow, upper effusive and inner extrusive sub-facies. Well understanding about volcanic facies can make gas exploration easier and more effective: volcanic reservoir exploration → effective reservoir finding → focusing on seismic analytic interpretation of the best four types of volcanic sub-facies which can become potential good reservoirs. |