应力条件制约下不同埋深煤储层物性差异演化

doi:10.7623/syxb2015S1008

石油学报 ›› 2015, Vol. 36 ›› Issue (s1): 68-75.DOI: 10.7623/syxb2015S1008

应力条件制约下不同埋深煤储层物性差异演化

李松¹, 汤达祯¹, 许浩¹, 陶树¹, 邵国良², 任鹏飞¹

1. 中国地质大学煤层气国家工程中心煤储层实验室中国地质大学能源学院北京 100083;
2. 中国石油华北油田公司河北任丘 062552

收稿日期:2015-03-11 修回日期:2015-06-22 出版日期:2015-11-30 发布日期:2015-12-09
通讯作者: 李松,男,1985年5月生,2008年获中国地质大学(北京)学士学位,2015年获中国地质大学(北京)博士学位,现为中国地质大学(北京)能源学院讲师,主要从事能源地质方面的教学研究工作。Email:lisong8585@gmail.com
作者简介:李松,男,1985年5月生,2008年获中国地质大学(北京)学士学位,2015年获中国地质大学(北京)博士学位,现为中国地质大学(北京)能源学院讲师,主要从事能源地质方面的教学研究工作。Email:lisong8585@gmail.com
基金资助:
国家自然科学基金项目(No.41272175、No.41530314)、国家重大科技专项(2011ZX05034,2011ZX05038,2011ZX05061)、中国石油天然气股份有限公司重大科技专项(2013E-2205)、中澳天然气技术伙伴关系基金研究生晋级奖学金和中央高校基本科研业务费专项资金项目(2652015321)资助。

Evolution of physical differences in various buried depth of coal reservoirs under constraint of stress

Li Song¹, Tang Dazhen¹, Xu Hao¹, Tao Shu¹, Shao Guoliang², Ren Pengfei¹

1. Coal Reservoir Laboratory of National CBM Engineering Research Center; School of Energy Resources, China University of Geosciences, Beijing 100083, China;
2. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China

Received:2015-03-11 Revised:2015-06-22 Online:2015-11-30 Published:2015-12-09

摘要/Abstract

摘要：

以鄂尔多斯盆地东缘煤储层为研究对象,采用水力致裂法获取地应力参数,同时利用实验室模拟技术,结合现场测试数据,从煤储层储集性和渗透性两方面开展应力条件下煤储层物性演化机理研究。随着煤层埋深的增大,地应力增高,煤岩孔隙受压闭合,煤储层孔隙度在应力作用下呈指数规律降低;不同煤阶煤岩各级孔径的孔隙在应力作用下的变形特征存在较大差异,随着应力增大,低煤阶煤岩大中孔体积下降明显,而中、高煤阶煤岩微小孔体积的下降幅度要高于大中孔。不同埋深和应力作用下的煤体变形和渗透率变化可分为3个阶段:埋深在600 m以内,地应力较低,煤岩裂隙发育较好,煤储层渗透率变化范围较宽;埋深在600~900 m,煤层处于三向受压状态,裂隙易受压闭合,渗透率普遍小于0.5 mD;埋深在900 m以下,地应力变强,且煤层受力不均,垂直主应力大于水平主应力,易产生新裂隙,煤储层渗透率出现高值。

关键词: 深部煤层气, 储层, 地应力, 孔裂隙结构, 孔隙度, 渗透率

Abstract:

Taking coal reservoir in the eastern edge of Ordos Basin as research objective, the ground stress parameters were obtained by hydraulic fracturing method. Meanwhile, through laboratory simulation technology and field test data, physical evaluation mechanism of coal reservoirs under stress conditions was studied from two aspects, i.e., reservoir property and permeability of coal reservoirs. The ground stress increase with burial depth, leading coal-rock pores are closed and porosity of coal reservoir is decreased exponentially under stress. Deformation characteristics of pores in various coal ranks have great differences under stress, as increasing stress, volumes of macro to meso-pores in the low-rank coal decrease obviously, while those of micro-pores in middle and high-rank coals show a larger descent range compared with macro to meso-pores. Coal deformation and permeability change under different burial depth and stress can be divided into three stages:when burial depth is less than 600 m, lower ground stress lead to well development of coal-rock fissures and wide change range of permeability of coal reservoirs; when burial depth is from 600 to 900 m, coal reservoirs are under a three-directional pressure condition, and therefore fissures are easily closed and permeability is generally less than 0.5 mD; when burial depth is deeper than 900 m, ground stress becomes stronger, and coal reservoirs are unevenly stressed, vertical principal stress is greater than horizontal principal stress, leading to generate new fissures easily and high values of permeability of coal reservoirs.

Key words: deep coalbed methane, reservoir, ground stress, pore and fissure structure, porosity, permeability

中图分类号:

TE122.2

李松, 汤达祯, 许浩, 陶树, 邵国良, 任鹏飞. 应力条件制约下不同埋深煤储层物性差异演化[J]. 石油学报, 2015, 36(s1): 68-75.

Li Song, Tang Dazhen, Xu Hao, Tao Shu, Shao Guoliang, Ren Pengfei. Evolution of physical differences in various buried depth of coal reservoirs under constraint of stress[J]. Acta Petrolei Sinica, 2015, 36(s1): 68-75.

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应力条件制约下不同埋深煤储层物性差异演化

Evolution of physical differences in various buried depth of coal reservoirs under constraint of stress

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