中国石油勘探 ›› 2018, Vol. 23 ›› Issue (6): 87-96.DOI: 10.3969/j.issn.1672-7703.2018.06.010

• 工程技术 • 上一篇    下一篇

超深层裂缝—孔隙型致密砂岩储层特征与属性建模——以库车坳陷克深8气藏为例

王珂1,2,3, 张荣虎3, 方晓刚4, 王俊鹏3, 张同辉2   

  1. 1 中国石油勘探开发研究院;
    2 中国石油塔里木油田公司;
    3 中国石油杭州地质研究院;
    4 贵州省非常规油气资源工程技术研究中心
  • 收稿日期:2017-10-11 修回日期:2018-08-07 出版日期:2018-11-15 发布日期:2018-11-13
  • 基金资助:
    国家科技重大专项“重点前陆冲断带储层改造机制与地质评价”(2016ZX05003-001),“大型岩性油气藏形成主控因素与有利区带评价”(2017ZX05001-002)。

Characteristics and property modeling of ultra-deep fractured-porous tight sandstone reservoir: a case study on the Keshen 8 gas reservoir in Kuqa depression

Wang Ke1,2,3, Zhang Ronghu3, Fang Xiaogang4, Wang Junpeng3, Zhang Tonghui2   

  1. 1 PetroChina Research Institute of Petroleum Exploration & Development;
    2 PetroChina Tarim Oilfield Company;
    3 PetroChina Hangzhou Research Institute of Geology;
    4 Guizhou Unconventional Oil and Gas Resources Engineering Technology Research Center
  • Received:2017-10-11 Revised:2018-08-07 Online:2018-11-15 Published:2018-11-13
  • Supported by:
     

摘要: 库车坳陷克深8气藏巴什基奇克组为超深层裂缝—孔隙型双重介质致密砂岩储层,系统开展储层特征分析及属性建模研究,可为克深8气藏高产稳产开发井的部署及开发措施的制定提供地质依据。薄片观察、扫描电镜、激光共聚焦和电子探针综合分析表明,巴什基奇克组储层以岩屑长石砂岩为主,孔隙类型主要为粒间孔,其次为粒内溶孔;在构造建模和岩相建模的基础上,采用序贯高斯模拟方法建立了基质孔隙度模型,并利用孔渗关系曲线方程建立了基质渗透率模型,划分出3个基质孔渗发育区。克深8气藏的构造裂缝主要形成于喜马拉雅运动中晚期近南北向的构造挤压作用,以直立剪切缝和高角度张性缝为主,在成像测井图像上表现为平行式组合和斜交式组合,部分高角度张性缝被硬石膏和白云石等矿物充填;基于构造应力场有限元数值模拟对构造裂缝参数进行了数值模拟计算,并以此为基础,采用序贯高斯模拟方法建立了构造裂缝属性模型,识别出4个孔隙度高值区和5个渗透率高值区。最后将储层基质属性模型与构造裂缝属性模型进行加和运算建立了双重介质属性模型,平面上划分出KS807井区、KS8-5井区和KS8-8—KS806井区3个高产稳产区,纵向上第3砂层组为高产稳产层段,在开发中应优先考虑。

 

关键词: 超深层, 裂缝—孔隙型, 致密砂岩储层, 属性建模, 库车坳陷, 巴什基奇克组

Abstract: The Bashijiqike Formation of the Keshen 8 gas reservoir in the Kuqa depression contains ultra-deep fractured-porous tight sandstone reservoir. Systematic researches on reservoir properties and modeling provide a geological basis for locating development wells with high and stable production and establishing a development plan in the Keshen 8 gas reservoir. Comprehensive analysis based on thin section observation, scanning electron microscopy, laser confocal microscope and electron probe shows that the Bashijiqike reservoir is dominated by lithic feldspar sandstone, pores are mainly intergranular pores and less intragranular dissolved pores. Based on structural and lithofacies modeling, the matrix porosity model was established by sequential Gaussian simulation method, and the matrix permeability model was established by using the pore-permeability curve equation, and three matrix porosity-permeability zones were divided. The tectonic fractures in the Keshen 8 gas reservoir were mainly formed with the near SN tectonic compression caused by the Himalayan movement. They are dominated by upright shear fractures and high-dip tensile fractures, and appear as parallel combination and skewed combination on image logs. Some high-dip tensile fractures are filled with minerals such as anhydrite and dolomite. Based on the finite element numerical simulation of the tectonic stress field, the numerical simulation of tectonic fracture parameters was carried out, and based on this, the tectonic fracture property model was established through sequential Gaussian simulation, and four high-porosity areas and five high-permeability areas were identified. Finally, the reservoir matrix property model and the tectonic fracture property model were added to establish a dual-medium property model, three high and stable production areas, Wells KS807, KS8-5 and KS8-8-KS806, were divided on plane, and in the vertical direction, the third sandstone group was proposed as a high and stable production interval. They should be given priority in future development.

Key words: ultra-deep reservoir, fractured-porous reservoir, tight sandstone reservoir, property model, Kuqa depression, Bashijiqike Formation

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