沁南-夏店区块煤储层地应力条件及其对渗透性的影响

doi:10.7623/syxb2015S1011

石油学报 ›› 2015, Vol. 36 ›› Issue (s1): 91-96.DOI: 10.7623/syxb2015S1011

沁南-夏店区块煤储层地应力条件及其对渗透性的影响

杨延辉¹, 孟召平², 陈彦君¹, 杨艳磊¹, 干大勇¹

1. 中国石油华北油田公司河北任丘 062552;
2. 中国矿业大学(北京)地球科学与测绘工程学院北京 100083

收稿日期:2015-01-22 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: 孟召平,男,1963年1月生,1983年获焦作矿业学院学士学位,1999年获中国矿业大学(北京)博士学位,现为中国矿业大学(北京)地球科学与测绘工程学院教授、博士生导师,主要从事煤与煤层气开发地质研究。Email:mzp@cumtb.edu.cn
作者简介:杨延辉,男,1968年10月生,1991年获石油大学(华东)学士学位,2010年获中国地质大学(北京)博士学位,现为中国石油华北油田公司勘探开发研究院高级工程师,主要从事煤层气勘探与开发研究。Email:yjy_yyh@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05061)、国家自然科学基金项目(No.41372163、No.41172145)、国家重点基础研究发展计划(973)项目(2012CB214705)、中国石油天然气股份有限公司重大科技专项(2013E-2205)和2014年度山西省煤基重点科技攻关项目(MQ2014-01、MQ2014-12)资助。

Geo-stress conditions of coal reservoirs in Q innan-Xiadian block and its influences on permeability

Yang Yanhui¹, Meng Zhaoping², Chen Yanjun¹, Yang Yanlei¹, Gan Dayong¹

1. PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
2. College of Geosciences and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

Received:2015-01-22 Revised:2015-06-22 Online:2015-11-30 Published:2015-12-09

摘要/Abstract

摘要：

采用水力压裂测试地应力方法,对沁南-夏店区块19口煤层气井3#煤层地应力分布进行了测试,并建立了3#煤层地应力、渗透率与煤层埋深以及储层渗透性与地应力之间的相关关系和模型,分析了地应力对煤储层渗透性的影响。结果表明:沁南-夏店区块最大水平主应力梯度为2.39~4.49 MPa/hm,平均为3.49 MPa/hm;最小水平主应力梯度为1.48~2.45 MPa/hm,平均为1.99 MPa/hm。煤储层渗透性受控于现今地应力和所处应力状态,煤储层现今地应力随深度的增加呈线性增大规律,煤储层渗透率与地应力之间服从负指数函数关系。煤储层埋深600 m以内,现今最小水平主应力小于12 MPa,煤储层渗透性相对较好,试井渗透率大于0.25 mD;埋深600~950 m,现今最小水平主应力为12~20 MPa,煤储层渗透性变差,试井渗透率平均为0.05~0.25 mD;埋深大于950 m,煤储层最小水平主应力大于20 MPa,试井渗透率平均小于0.05 mD。

关键词: 煤储层, 现今地应力, 渗透性, 埋藏深度, 沁南-夏店区块

Abstract:

Using hydraulic fracturing method for geo-stress test,distribution of geo-stresses of No.3 coal reservoir of 19 coalbed methane wells in Qinnan-Xiadian block was well studied. Meanwhile,relationships and corresponding models were established between geo-stress,permeability and burial depth of coal reservoir,as well as between reservoir permeability and geo-stress,at the same time,influences of geo-stress on coal reservoir permeability were also analyzed. Research results show that gradient of maximum horizontal principal stress is from 2.39 to 4.49 MPa/hm (average 3.49 MPa/hm); gradient of minimum horizontal principal stress range from 1.48 to 2.45 MPa/hm (average 1.99 MPa/hm). Permeability of coal reservoir is controlled by present geo-stress and regional stress state. The present geo-stress of coal reservoirs shows linear increase law with depth,and negative exponential function between permeability and geo-stress of coal reservoir. When buried depth is less than 600 m,the present minimum horizontal principal stress is less than 12MPa,and coal reservoir permeability is relatively high,well testing permeability is greater than 0.25 mD. When buried depth is from 600 to 950 m,the present minimum horizontal principal stress rang from 12 to 20 MPa,coal reservoir permeability decreases,and well testing permeability varies from 0.05 to 0.25 mD on average. When buried depth is more than 950 m,the minimum horizontal principal stress is greater than 20 MPa,and well testing permeability is less than 0.05 mD on average.

Key words: coal reservoir, present geo-stress, permeability, buried depth, Qinnan-Xiadian block

中图分类号:

TE311

杨延辉, 孟召平, 陈彦君, 杨艳磊, 干大勇. 沁南-夏店区块煤储层地应力条件及其对渗透性的影响[J]. 石油学报, 2015, 36(s1): 91-96.

Yang Yanhui, Meng Zhaoping, Chen Yanjun, Yang Yanlei, Gan Dayong. Geo-stress conditions of coal reservoirs in Q innan-Xiadian block and its influences on permeability[J]. Acta Petrolei Sinica, 2015, 36(s1): 91-96.

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沁南-夏店区块煤储层地应力条件及其对渗透性的影响

Geo-stress conditions of coal reservoirs in Q innan-Xiadian block and its influences on permeability

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