
2016年第10期
中州煤炭
大港油田储层特征及敏感性评价
张德明,贾义洲
(长江大学,湖北荆州434000)
总第250期
摘要:在综合分析研究大港油由两口预探井储层岩心资料的基础上,采用压汞分析、X射线衍射、滴定等方法,详细介绍了储层物性特征、孔隙结构特征、黏土矿物类型和含量及地层水组分,通过敏感性试验,主要包括速敏、水敏、盐敏、碱敏和酸敏等,揭示储层特征与地层损害因素的内在联系,系统评价了储层潜在损害因素类型和敏感性程度,结果表明:储层临界流速为0.1mL/min,为中等速敏;临界矿化度为18000mg/L,具有中等程度的水敏效应;pH值为11时,储层具有强碱敏;储层岩心对盐酸和土酸均无敏感性,为可酸化处理储层。
关键词:大港油田;储层特征;敏感性;黏土矿物
中图分类号:TE31
文献标志码:A
文章编号:1003-0506(2016)10-0146-04
Reservoir characteristics and sensitivity evaluation of Dagang oilfield
Zhang Deming,Jia Yizhou
(Yangtze Uniwersity,Jingzhou434000, China)
Abstract : Based on the comprehensive analysis of reservoir core data for two mine shafts of Dagang oilfield, with the application of mer-cury analysis,X-ray diffraction,titration method, the physical properties of reservoir pore structure, clay mineral type and content and formation water component were described in detail. By the test of sensitivity ( including velocity sensitivity , water sensitivity , salt sensi-tivity ,alkali sensitivity and acid sensitivity and so on) ,the intrinsic link of the reservoir characteristics and formation damage factors were revealed,the potential damage to the reservoir type and sensitive factor degree were systematically evaluated.the results showed that : the reservoir critical flow rate is 0.1 mL/min , is in constant sensitization;critical salinity is 18 000 mg/L, with a moderate degree of water sensitivity effects ; pH value of reservoir 11 having alkali-sensitive; reservoir core of hydrochloric acid and mud acid had no sensi-tivity to acidification process reservoir.
Keywords:Dagang oilfield;reservoir characteristies; sensitivity ;clay minerals
0引言
油气层损害是指在油气井作业工程中导致储集层渗流阻力增加和渗透率降低所经历的物理、化学变化的过程。对于不同的油气层,其储集特征和导致损害的外部环境均有较大的区别,因此对油气层损害机理的研究是保护油气层技术中一项必不可缺少的基础工作[1-12]。要制订一个有针对性的预防油气层损害的措施及保护方案,必须事先对目的层的储层特征和主要损害因系有一个比较清楚的认识,
弄清其损害机理及程度,要弄清楚储层的潜在损害因素,就必须认识储层的有关特征。储层特征参数主要包括3个方面:①储层物性及孔隙结构特征;② 储层岩石性质及岩石中敏感性矿物类型及含量:③ 储层流体的组成和性能。一旦具备了这3方面的储层特性资料,就能判断出储层可能受到的损害。
文中根据大港油田的岩性、物性资料进行综合分析,对油田储层主要特征进行了详细介绍,然后通过室内敏感性试验对其主要损害因素进行评价,从而为设计该地区钻、完井液体系创造条件。
收稿日期:2016-06-06;责任编辑:案爱新D01:10.19389/j.cenki.1003-0506.2016.10.035
6 引用格式:张德明,贾义洲.大港油田储层特征及敏感性评价[J].中州煤炭,2016(10):146-149,153.
Zhang Deming,Jia Yizhou. Reservoir characteristics and sensitivity evaluation of Dagang oilfield [J].Zhongzhou Coal, 2016 ( 10 ) : 146-149 153.
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