| PDF: | |
| Time: | 2007 |
| Journal: | Journal of Jilin University(Earth Science Edition) |
| Volumn: | 37 |
| Issue: | 6 |
| Pages: | 1074-1082 |
| Type: | Other |
| Author: | Huafeng Tang,Zhengshun Xu,Pujun Wang,Ping Shu,Yulong Huang,Weihua Bian |
Abstract: | According to eruptive scale illustrated by drilling lithology , facies characteristics and seismic data , early Cretaceous volcanic edifices of Yingcheng Formation in Xujiaweizi faulted depression,Songliao Basin were classified into pyroclastic volcanic edifice, lava volcanic edifice and compound volcanic edifice. The facies composition of pyroclastic volcanic edifice was listed as fellows: 9.3%for volcanic vent facies, 55.3%for explosive facies,29.2% for effusive facies, 1.4%for extrusive facies and 4.8%for volcanic sedimentary facies.The pyroclastic volcanic edifices is 0.5-1.5 km wide and 50-220m thick . The facies composition of lava volcanic edifice was 8.1% for volcanic vent facies, 23.4% for explosive facies, 62.6 %for effusive facies, 5.1%for extrusive facies, and 0.8 %for volcanic sedimentary facies. T he lava volcanic edifices is 1-2 km wide and 200 -300 m thick . The facies composition of compound volcanic edifice was 4. 9%for volcanic vent facies, 34. 4%for explosive facies , 56. 8%for effusive facies, 2.6% for extrusive facies and 1.3% for volcanic sedimentary facies. The compound volcanic edifices is 2-4km wide and 300-450m thick. The scale of reservoir flow unit is controlled by subfacies of volcanic edifices. So the scale of reservoir flowing unit is various for each volcanic edifice, pyroclastic volcanic edifice is 0. 3- 1.5km in width and less than 60m in thickness,lava volcanic edifice is 1-2km in width and less than 80m in thickness, compound volcanic edifice is 1.5-3.0 km in width and less than 100 m in thickness. So the distance of wells and hydraulic fracturing plan are different in each kind volcanic edifice during the development . |