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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

白云岩储层地质力学特征分析及在储层改造优化应用——以塔中东部为例

尹国庆，张辉，袁芳，陈胜，李超，赵崴，琚岩，陈培思   

  1. 中国石油塔里木油田分公司勘探开发研究院，新疆 库尔勒 841000
  • 收稿日期:2014-12-17 修回日期:2015-05-21 出版日期:2015-07-10 发布日期:2015-07-10
  • 作者简介:尹国庆(1979-)，男，湖北襄樊人，高级工程师，主要从事储层地质力学研究及应用工作.E-mail:yinguoqing-tlm@petrochina.com.cn.

Geomechanical Characteristics of Dolomite Reservoir and Its Application in Stimulation Optimization:An Example of East of Tazhong

YIN Guo-qing，ZHANG Hui，YUAN Fang，CHEN Sheng，LI Chao，ZHAO Wei，JU Yan，CHEN Pei-si   

  1. Tarim Oilfield Company,PetroChina,Korla 841000,China
  • Received:2014-12-17 Revised:2015-05-21 Online:2015-07-10 Published:2015-07-10

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摘要：

针对塔里木油田塔中东部中下寒武统白云岩储层岩性组分复杂，石膏含量较高，压裂改造效果差等问题，在岩石力学实验、岩石组分精细确定基础上建立白云岩储层弹性模量、泊松比、强度、可压裂性等计算模型，并分析不同岩性组分岩石力学参数的影响规律，同时通过井筒资料分析地应力方位，建立地应力计算模型，分析不同组分含量对地应力影响，确定精细地应力剖面，并分析纵向变化规律|另一方面，开展天然裂缝产状信息处理、提取，分析主应力与裂缝走向关系，利用已压裂井资料确定天然裂缝内聚力、滑动摩擦系数，并定量计算天然裂缝面正应力、剪应力，确定不同注入压力下的开启率，从而确定中深5井超深、致密、含膏白云岩储层以压裂为主的改造方案，在此基础上根据分层应力剖面、水平应力差、地层可压裂性、天然裂缝力学特征优化压裂施工层段、泵注程序、分段射孔簇、施工压力等。

关键词: 白云岩, 地质力学, 天然裂缝, 开启率, 可压裂性, 压裂优化

Abstract:

Calculated models of elastic modulus,Poisson′s ratio,strength of dolomite reservoir have been established based on the rock mechanics experiment and the rock components about the complex lithology dolomite reservoir.Meanwhile,the orientation and magnitude of in situ stress have been identified through the wellbore breakouts and induced fractures,and stress profile has been established.On the other hand,natural fracture information about strike and dip has been extracted,and differences between the orientation of principal stress and the natural fractures′ strike have been analyzed.The sliding friction coefficient of natural fracture has been clarified,the shear stress and effective normal stress have been calculated accurately,and the shear slip rates under different injection pressure have been obtained.Therefore,the reconstruction scheme of ultra-deep,dense,gypseous dolomite reservoir has been determined.Finally,the fracturing layer,pump injection program,segmental perforation clusters,operating pressure have been optimized based on stratified stress profile,horizontal stress difference,formation fracability,natural fracture shear slip.

Key words: Dolomite, Geomechanics, Natural fracture, Shear slip rate, Fracability, Fracturing optimization

中图分类号: 

  • TE122.2

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