1. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China;
2. Exploration & Development Institute, Daqing Oilfield company, PetroChina, Daqing, Heilongjiang 163712, China;
3. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
4. Research Center of Palaeontology & Stratigraphy, Jilin University, Changchun, Jilin 130026, China
Abstract：Based on short distance well pattern and high resolution 3D seismic data in QS Gas field, Songliao Basin, NE China, we carry out a research on volcano-stratigraphy framework of Yingcheng Formation. The volcano-formation boundary system is consisted by overlapping 3 key eruptive interval unconformity boundaries (EIUB), tens eruptive unconformity boundaries (EUB), a few eruptive conformity boundaries (ECB) and intrusive contact boundaries (ICB). 5 volcanic edifices constrained by the 3 EIUBs are identified as bottom and top boundaries of volcanic rocks of Yingcheng Formation. Furthermore, 13 cooling units constrained by the boundary system are also identified. The volcanostratigraphy shifts from southeast to northwest at first, and then shift to northeast. The volcanic edifices in the early stage are characterized by large thickness, small size and cone, such as the VE-1 and VE-2, which are mainly consisted of the lava flows. The volcanic edifices in middle-later stage are characterized by small thickness, large size, and sheet-shield without obvious eruptive center, such as VE-3, VE-4 and VE-5, which are mainly consisted of deposit units. The boundaries, lava flows and deposit units control the distribution of high porosity and permeability zone while the lava flows and deposit units control reservoir types and scales. The volcanostratigraphic boundary provides a very important mark for exploration.
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