Accumulation Dynamic Characteristics and the Dynamic Equations of Shale Gas
详细信息
- 责任者：Bian Ruikang (Petroleum Exploration and Development Research Institute ; SINOPEC ; Beijing 100083 ; China) ; Zhang Jinchuan
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(3)
- 关键词：页岩气 ; shale gas ; 成藏动力学 ; pool-forming dynamics
- 页码：p.254-259
- 图表：illus., 3 tables, 20 refs.
- 分类号：1003
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The accumulation dynamic characteristics of shale gas are systemically analyzed according to the special accumulation pattern of both absorbed and free gases.The free gas of shale gas accumulation has similar dynamic types compared with source-contacting gas and conventional reservoir gas with expansive pressure of gas generation,hydrostatic pressure at the top of gas column,hydrostatic pressure at the bottom of gas column,gravity of gas column,capillary pressure,dynamic water-head pressure,etc.;while adsorption force and desorption force are the cause of gas phase state changing between absorbed gas and free gas at the surface of organic grains and rock minerals.There are two types of gas dynamics: migration dynamics and accumulation dynamics.As a gas whose source rock and reservoir are the same body,the migration dynamic and accumulation dynamic directions of the shale gas are reversed.The accumulation of shale gas is divided into four stages,and the accumulation dynamic characteristics of each stage are systemically analyzed.Accumulation(migration) dynamic equations are established according to the dynamic characteristics,and a general equation of shale gas accumulation(migration) dynamics is established using the method of coefficient assignment.