孔喉结构对超深层碳酸盐岩气藏多类型储层渗流能力的影响

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国家科技期刊平台
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中文摘要：超深层碳酸盐岩气藏孔喉结构非均质性强,渗流机制复杂.选取川西北地区双鱼石区块栖霞组储层岩心,通过多尺度CT试验、核磁共振试验和储层条件下的单相渗流、气水两相渗流及应力敏感试验等,系统定量地研究超深层多类型储层孔喉结构特征参数与渗流特征参数的相关性,深入剖析裂缝、大孔和基质孔隙对超深层多类型气藏气体单相和气水两相渗流的影响.结果表明:不同于中深层储层,增加喉道数量对于提高目的超深层储层的渗流能力非常关键;裂缝发育增加了岩样喉道数量、提高了岩样的连通性从而来大幅度提高岩样的气体渗流能力,并降低了含水气藏的启动压力梯度,缩小了岩样的气水两相共渗区间,但裂缝受压易形变的特质导致岩样的应力敏感性增强,在高压差时岩样的渗流能力和弹性能也急速下降;大孔喉发育提高了储层的储容能力,其抵抗变形能力强的特质有利于降低岩样的应力敏感性,在高压差时维持岩样较高的渗流能力和弹性能.在实际生产过程中,应考虑对裂缝-孔隙型和裂缝-孔洞型储层在生产初期控制产气速度以维持长期稳产,对孔洞型和孔隙型储层增大生产压差或进行压裂和酸化等工艺措施以释放储层产能.

外文标题：Effect of pore throat structure on flow capacity of multi-type ultra-deep carbonate gas reservoirs

外文摘要：The pore-throat structure of ultra-deep carbonate gas reservoirs is highly heterogeneous,and its flow mechanism is complex.In this study,rock samples of the Qixia Formation in the Shuangyushi block in the Northwest Sichuan Basin were selected,and various methods were used for core analysis and flow experiments,including multi-scale CT,nuclear magnetic resonance,stress-sensitivity,elastic energy testing under reservoir conditions,single-phase flow and gas-water two-phase flow.The relationship between the characteristic parameters of pore-throat structure and the characteristic parameters of flow in the ultra-deep multi-type reservoir were systematically and quantitatively investigated,and the influences of fractures,macropores and matrix pores on single-phase and two-phase flow were analyzed.The results show that,different from medi-um-deep reservoirs,increase of the throat number is critical to the improvement of the flow capacity of the targeted ultra-deep reservoir.Development of fractures can greatly improve gas flow capacity of the rock samples by increasing the throat number of and improving the pore connectivity,which can reduce the threshold pressure gradient of water-bearing gas reservoirs,and shrink the gas-water two-phase copermeability interval.However,the stress sensitivity of the rock sample can be enhanced,and its flow capacity and elastic energy decrease rapidly under high pressure difference due to the characteristics of the frac-tures that can be easily deformed under pressure.Development of large pores or throats can improve the storage capacity of the reservoir,and their strong resistance to deformation is beneficial to reduce the stress sensitivity of rock samples,which can maintain high flow capacity and elastic energy of the rock samples under high pressure difference.In the actual produc-tion process,it should be considered to control the gas production rate for fracture-porous type and fracture-cavity type reser-voirs in the early stage of production in order to maintain long-term stable gas production rate,and to increase the production pressure difference or perform stimulation measures such as fracturing and acidification for cavity type and porous type reser-voirs in order to release reservoir productivity.

外文关键词：

ultra-deep gas reservoirQixia Formationcarbonate rockflow mechanismfracture-cavity structurecorrela-tion analysis

作者：

张钰祥、闫海军、位云生、曹正林、郭建林、杨胜来、邓惠、陈掌星、郑国强、王忠楠

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作者单位：

中国石油勘探开发研究院,北京 100083

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

中国石油西南油气田分公司,四川成都 610051

四川石油管理局有限公司,四川成都 610051

加拿大卡尔加里大学化学与石油工程系,卡尔加里 T2N1N4

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关键词：

超深层气藏栖霞组碳酸盐岩渗流机制缝洞结构相关性分析

基金：

中国石油天然气有限公司科技项目中国石油天然气有限公司科技项目四川省自然科学基金项目

项目编号：

2023YQX105012023YQX10503ZK2023NSFSC0261

出版年：

2024

DOI：

10.3969/j.issn.1673-5005.2024.04.014

中国石油大学学报(自然科学版)

中国石油大学

中国石油大学学报(自然科学版)

CSTPCD北大核心

影响因子：1.169

ISSN：1673-5005

年,卷(期)：2024.48(4)

参考文献量16