| PDF: | |
| Time: | 2010 |
| Journal: | Natural Gas Industry |
| Volumn: | 30 |
| Issue: | 3 |
| Pages: | 35-39 |
| Type: | Other |
| Author: | Huafeng Tang,Weihua Bian,Pujun Wang,Chuanjin Jiang,Ying wang |
Abstract: | The volcanic rocks in the first member of the Yingcheng Formation in Xingcheng area, Songliao Basin, can be divided into three eruption cycles, including lower, middle and upper cycles. In the first member of the Yingcheng Formation, 98% of the industrial gas flow is obtained in the upper cycle. Therefore, the upper cycle is the primary target of volcanic reservoir exploration and development, and the primary task is to define the well -seismic correlation marks of each cycle.①The lower cycle is dominated by acidic rocks and contains some intermediate and basic rocks. Effusive facies occupies 90%.The GR value of some intervals is less than 90API.The seismic reflections are in sheet-shield-cone shape and feature in medium-high amplitude, medium-high frequency and good continuity .②The middle cycle is dominated by acidic rocks and contain minor intermediate rocks.Effusive facies occupies 79. 5%.The GR values are mostly in the range of 90- 160API.The seismic reflections are in mound,lenticular, dome or slab shapes and feature in medium-low amplitude, medium-low frequency and fair-good continuity .③The upper cycle is completely acidic rocks.Effusive facies occupies 47. 1%, while the percentage of eruptive facies increases remarkably.Most of the GR values are in the range of 130- 260API.The seismic reflections are in mound, wedge or sheet shapes, featured by medium-low amplitude, medium-low frequency , good-poor continuity .The well-seismic correlation marks of the volcanic eruptive cycles also provide bases for rapidly identifying exploration targets of volcanic rocks in the adjacent blocks. |