| PDF: | |
| Time: | 2006 |
| Journal: | Petroleum Exploration and Development |
| Volumn: | 33 |
| Issue: | 4 |
| Pages: | 436-441 |
| Type: | EI |
| Author: | PuJun Wang,RiHui Cheng,Hongyan Wang,XiaoDong Liang,XuanLong Shan,BaoJun Shan,XiaoDong Sun,WanZhu Liu |
Abstract: | There are two successions of source rocks in the northern Songliao Basin, which are dark shale and coal developed in the faulted sequences of Shahezi (K1s) and Yingcheng (K1y) Formation and dark shale in the depressed sequences of Qingshankou (K2qn) and Nenjiang (K2n) Formation. Reservoir rocks include sandstone and conglomerate in the overall sequence and volcanic rocks in the lower succession of basin fillings. Regional cap rocks are the mudstones of K2n1+2 and K↓2qn↓1. According to basin filling signature, tectonic evolution, and exploration experiences, the authors predict three kinds of preferred oil and gas potential targets for next step exploration. The first is volcanic reservoirs similar to the high-productive Well XS1 drilled in Daqing. The second is unconformities related to those seismic reflections of T5, T4and T3. The upper and lower sequences of the basin fillings are different concerning tectonic evolution, stratigraphy and relevant hydrocarbon-bearing features. Oil is predominantly contained in the upper and gas is expected to be in the lower. The third is reverse fault belts which include both pre-Cenozoic reservoirs and reservoirs formed since Neogene. |