盆地超压层段非幕式突破期的地热场模型数值解法

李星; 吴冲龙; 刘刚; 毛小平

盆地超压层段非幕式突破期的地热场模型数值解法

1.
中国地质大学数理系, 湖北武汉 430074
2.
中国地质大学资源学院, 湖北武汉 430074
3.
中国地质大学地球物理系, 湖北武汉 430074

基金项目:

国家自然科学基金“九五”重点项目 49732005

详细信息

作者简介:
李星(1962-), 男, 副教授, 1997年毕业于中国地质大学(武汉), 获工学硕士学位, 现主要从事盆地地热场方面的研究

中图分类号: P628⁺.3;TE121.1⁺1
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出版历程
- 收稿日期: 2001-01-14
- 刊出日期: 2001-09-25

NUMERICAL SOLUTION TO GEOTHERMAL FIELD MODEL OF OVERPRESSURE STRATUM AT NON-EPISODE MODE EXPULSION STAGE OF BASIN

1.
Department of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Department of Geophysics, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 盆地超压层段的地热场模拟对超压成因研究及油气生成、排放机理分析有重要意义, 但求解超压层段的热传递方程的数值解法至今仍没有被很好地解决.问题的关键在于确定超压流体速度场.由于超压流体发生幕式突破之前的排出速率极低, 其速度场 v =v_x i +v_z k 近似满足条件∂_{v_x}/∂_x+∂_{v_z}/∂_z=0, 可以将其近似地视为稳定的不可压缩的无源流体, 利用这一条件及相应的边界压力条件, 可使整个计算过程得到简化.在此基础上所建立的地热场模型有限元数值解法和模拟软件, 能够实现对含油气盆地在幕式突破之前的超压层段地热场进行动态模拟.
- 沉积盆地 /
- 地热场 /
- 超压层段 /
- 超压流体速度场 /
- 模拟 /
- 热传递方程 /
- 数值解法
Abstract: The simulation of the geothermal field of overpressure stratum in a basin is a key to the research into the overpressure genesis and its effect on oil and gas generation and expulsion. However, the numerical solution to the thermal conduction equation of the overpressure stratum has not been proved very effectively. The key to this problem is determination of the speed field of the overpressure fluid. The expulsion speed of the overpressure fluid is extremely low before the episode-like expulsion of the overpressure fluid. In addition, the corresponding speed field: v =v_x i +v_z k satisfies the condition ∂_{v_x}/∂_x+∂_{v_z}/∂_z=0. In this sense, this speed field can be approximately regarded as stable incompressible source-free fluid. This condition and the corresponding boundary pressure condition are both employed to simplify the whole calculation process. Therefore, the finite element numerical solution of the geothermal field and the corresponding simulation software thus designed can be used to simulate dynamically the geothermal field of the overpressure stratum before the episode-like expulsion in the petroleum and gas basin.
- sedimentary basin /
- geothermal field /
- overpressure stratum /
- overpressure-fluid speed field /
- simulation /
- thermal conduction equation /
- numerical solution

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参考文献(16)

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