富含气页岩储层超低含水饱和度成因及意义

方朝合，黄志龙，王巧智,郑德温,刘洪林

doi:10.11764/j.issn.1672-1926.2014.03.471

天然气地球科学 >

2014 , Vol. 25 >Issue 3: 471 - 476

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.03.471

非常规天然气

富含气页岩储层超低含水饱和度成因及意义

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1.中国石油大学（北京)油气资源与探测国家重点实验室，北京102249；
2.国家能源页岩气研发（实验)中心，河北廊坊 065007；
3.中国石油集团非常规油气重点实验室，河北廊坊 065007

方朝合（1976-)，男，山东夏津人，工程师，博士研究生，主要从事非常规油气开发技术研究.E-mail:fangch69@petrochina.com.cn.

收稿日期: 2013-06-18

修回日期: 2013-09-06

网络出版日期: 2014-03-10

基金资助

国家科技重大专项（编号:2011ZX05018)资助.

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Cause and Significance of the Ultr-|low Water Saturation in Gas-enriched Shale Reservoir

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1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
2.National Energy Shale Gas R ＆ D (Experiment) Center,Langfang 065007,China;
3.Key Laboratory of Unconventional Oil ＆ Gas,Langfang 065007,China

Received date: 2013-06-18

Revised date: 2013-09-06

Online published: 2014-03-10

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摘要

在页岩气开采过程中，需要对储层进行改造才能实现有效经济开采。目前北美和国内普遍采用的储层改造方法是水平钻完井结合大型水力压裂。开展入井流体与储层相互作用研究是提高储层改造成功的基础，而储层原始含水状态和成因研究则是开展上述工作的前提。通过对南方海相页岩储层研究发现，富含气页岩储层普遍存在超低含水饱和度现象，其成因主要有压实排水、生烃消耗和汽化携液排水等。超低含水饱和度增加了页岩吸附能力，延伸了可动孔喉范围，提高了气相渗透率，但在工程作业过程中加速了水相渗吸速率，强化了水相滞留效应，使页岩气藏水相圈闭损害潜力增大。在页岩气开发有利区评价、气藏改造及开发过程中，须加倍重视超低含水饱和度这一客观事实及其可能衍生的工程作业损害。

关键词： 页岩储层; 超低含水饱和度; 生烃; 水相圈闭

本文引用格式

方朝合，黄志龙，王巧智,郑德温,刘洪林 . 富含气页岩储层超低含水饱和度成因及意义[J]. 天然气地球科学, 2014 , 25(3) : 471 -476 . DOI: 10.11764/j.issn.1672-1926.2014.03.471

Abstract

During the exploitation of shale gas,it is necessary to conduct reservoir reconstruction for the purpose of economic recovery.Workers in North America and China now adopt the method of combining drilling and completion of horizontal well with massive hydraulic fracturing,which needs enormous amount of water and sand.The interaction of these fluids and reservoir rocks lays the foundation for the success of reservoir reconstruction,whereas the initial water saturation of reservoirs and the understanding of causes of this state are premises of the method.With studies of the marine shale gas reservoirs in southern China,it is found that gas-enriched reservoir often has ultra-low water saturation,which is caused by hydrocarbon generation,consumption and evaporation,etc.Ultra-low water saturation improves adsorption capacity of shale,extends the movable pore throat radius，and increases the gas phase permeability.However,it also accelerates the water-base rates of adsorption and permeation,deteriorates water and hydrocarbon phase trapping problems，and brings more potential damages to aqueous phase trapping of shale gas.Under this circumstance,more attention needs to be paid to the negative effect of ultra-low water saturation and its work damage during the evaluation,reconstruction,and development of shale gas reservoirs.

Key words： Shale reservoir; Ultra-low water saturation; Hydrocarbon generation; Aqueous phase trappin

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