| PDF: | |
| Time: | 2011 |
| Journal: | Chinese J. Geophys. (in Chinese) |
| Volumn: | 54 |
| Issue: | 2 |
| Pages: | 620-627 |
| Type: | SCI |
| Author: | Huafeng Tang,Ruilei Li,Yan-hui Wu,Xiaohui Feng,liyuan Wang |
Abstract: | Volcanic strata have pseudostratified, stratified and massive textures which are more complex than sedimentary rocks. Thus, it should not simply be simulated with stratified models, and it results in a difficulty in volcanic reservoir prediction with seismic data. A primary key point for volcanic reservoir exploratory and development is to build up proper volcanostratigraphic models. Both pseudostratified and stratified models are built up based on typical volcanostratigraphic textures of outcrops of Jiutai and Datun area in the southeastern Songliao Basin. The internal beds of psedostratified strata show great changes on dipping direction and angles, and contacted obliquely with the top and bottom strata. The dip angle of volcanic rock bed decreases from central to distal parts along a given edifice’s limb, and the exact stratigraphic textural model is built up by interpolation following the top and/or bottom surface trends. A borehole named as Well YS2 is performed impedance inversion constrained by stratified and pseudostratified models respectively. As a result, both dimension and thickness of low-impedance show deviations with former stratified model compared with pseudostratified model. Therefore, the stratigraphic texture of volcanic edifice should be precisely characterized before impedance inversion, and then the stratigraphic textural model is built up with internal interpolation to ensure the inversion reliability. This study offers a theoretical basis for effective prospection and exploration of volcanic petroleum reservoirs. |