| PDF: | |
| Time: | 2016 |
| Journal: | Journal of Jilin University (Earth Science Edition) |
| Volumn: | 46 |
| Issue: | 4 |
| Pages: | 1056-1070 |
| Type: | Other |
| Author: | Pujun Wang,Yangyang Jiao,Kaikai Yang,Zengbao Zhang,Weihua Bian |
Abstract: | Rock\\\'s classification has long been an intriguing task for geologists all over the world. With the development of volcanic reservoir exploration, volcanic classification buried in petroliferous basins has become increasingly needed work recently. Based on comprehensive summarization of the available classification scenarios of volcanic rocks, we proposed a so called structure-composition-origin volcanic classification for the Junggar basin focusing on the volcanic reservoir evaluation and exploration. The related data base includes 3 outcrops of 4.2 km accumulative thickness and 21 wells of 474 m volcanic core sections. Geochemical data and thin sections work have been done on these samples. 8 categories and 45 types are classified for the volcanogenic successions. Volcanic lavas, breccia-bearing lavas, pyroclastic rocks, sedimentary pyroclastic rocks, pyroclastic-bearing sedimentary rocks, hypabyssal rocks and subvolcanic rocks, and platonic rocks are described in detail. Paleozoic volcanic rocks interested have generally been suffered from alterations which can change the petrochemical compositions, and affect the result of the chemical classification using the TAS diagram. Methods were provided for the precise naming of the altered volcanic rocks in the paper. Correlations have been well established between volcanic lithology and reservoir features in the basin. The results would be useful for similar basins concerning volcanic classification and reservoir evaluation and exploration. |