Shallow Gas Genesis and Reservoir Forming Mechanism in the South of Daqing Placanticline
详细信息
- 责任者：Fu Xiaofei (College of Earth Sciences ; Northeast Petroleum University ; Daqing 163318 ; China) ; Wang Hongyu
- 刊名：Earth Science
- 出版年：2011
- 卷期：36(1)
- 关键词：浅层气 ; shallow gas ; 成藏模式 ; pool-formed model ; 黑龙江省 ; Heilongjiang Province
- 页码：p.93-102
- 图表：8 illus., 2 tables, 13 refs.
- 分类号：1003
- 出版序号：20120309
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
Shallow gas in the south of Daqing placanticline is mainly biogas originated from K1n1+2, mixed with a small amount of thermogenic gas of K1qn and inorganic CO2. The main biogas generation and expulsion period of K1n1+2 is the end of K2m sedimentary period, when fault activities caused the formation of anticline and fault trap of Heidimiao oil layer and induced vertical migration of biogas. The composite of the three periods made large amount of biogas migrate into Heidimiao oil layer. Active faults are all boundary faults in fault-condensed belt, along which biogas migrated vertically. The position of biogas accumulation depends on allocation relation between fault and strata of two walls. The wall whose dip is contrary to that of the fault is the main position for biogas accumulation.