Formation and Distribution of Volcanic CO2 Gas Pools in Songliao Basin
- 责任者：Zhang Qingchun (PetroChina Research Institute of Petroleum Exploration and Development ; Beijing 100083 ; China) ; Hu Suyun
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(1)
- 关键词：二氧化碳 ; carbon dioxide ; 油气藏形成 ; reservoir formation
- 页码：p.109-120
- 图表：10 illus., 1 table, 23 refs.
- 分类号：1003
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
Mesozoic-Cenozoic volcano-magmatic activities developed in Songliao rift basin, with characteristics of multi-phase eruption, wide distribution and good reservoir condition. Volcanic activities were generally central vent eruption, mainly developing medium-basic and acidic volcanic assemblages, rhyolite, tuff and other rock types, two types of explosive facie and effusive facie. Mesozoic volcanic rocks are widely distributed in the basin, while Cenozoic volcanic rocks more exposed outside the basin and less drilled in the basin. Highly-enriched CO2 in the basin is of mantle-derived inorganic origin caused by mantle-derived magma degassing during Qingshankou and Cenozoic volcanic activity period. The formation of volcanic CO2 gas pools are mainly controlled by the background of deep structure, deep-large faults and Mesozoic-Cenozoic volcanic rocks. Based on the controlling factor analysis, five CO2 accumulation plays were predicted.