Characteristics of Methane Isothermal Adsorption for Paleozoic Shale in Subei Area
详细信息
- 责任者：Liu Xiaoping (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Dong Qian
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(5)
- 关键词：页岩气 ; shale gas ; 吸附作用 ; adsorption ; 苏北盆地 ; Subei Basin
- 页码：p.1219-1224
- 图表：6 illus., 1 table, 28 refs.
- 分类号：1003
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
The shale gas content is one of the most important indicators to evaluate shale reservoirs,and of great significance to forecast reserves.As adsorbed gas content plays an important proportion in shale gas content,the evaluation of adsorptive capacity in shale reservoirs is very necessary.Through methane isothermal adsorption experiments of Paleozoic shale samples from three different sets of strata in Subei Area,the shale isothermal adsorption curves are obtained to analyze the main affecting factors of adsorption gas contents in shale reservoirs.The results show that the saturated adsorption(V L) are 1.18-4.85 m3/ t with an average of 2.89 m3/ t,and the Langmuir pressure constant(P L) are 2.01-4.24 MPa with an average of 2.67 MPa.The adsorption capacity varies among these three different sets of shale strata.Mufushan,Dalong and Longtan formations have much more adsorption gas contents than Wufeng-Gaojiabian and Gufeng formations.The main affecting factors of adsorption gas contents are concluded as follows:(1) TOC directly affects the maximum adsorption gas content,the higher the organic carbon,the greater the maximum adsorption gas content;(2) with similar values of the organic matter content,organic maturity and the same pressure,the shale with high clay contents adsorbs more gas;in the shale with low organic carbon,illite plays a vital role in the adsorption,and the adsorbed gas contents is relatively high in those shales with high contents of illite;(3) the required minimum pressure(critical pressure) making shale saturated with adsorbed gas will decrease with the increase of TOC.The experiments also show that the organic maturity has no obvious relation with the saturated adsorbed gas contents.
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