石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (6): 1188-1196.doi: 10.11743/ogg20200607

• 油气地质 • 上一篇    下一篇

四川盆地普光地区嘉陵江组二段碳酸盐岩储层裂缝发育规律

祖克威1,2(), 范凌霄1, 王波3, 曹东升2, 管聪2, 李中超1, 程秀申1   

  1. 1. 中国石化 中原油田分公司 勘探开发研究院, 河南 郑州 450018
    2. 中国石油大学(北京) 地球科学学院, 北京 102249
    3. 中海油能源发展股份有限公司 工程技术分公司 中海油实验中心, 天津 300452
  • 收稿日期:2019-04-16 出版日期:2020-12-28 发布日期:2020-12-09
  • 作者简介:祖克威(1986-),男,博士,职称构造应力场分析与储层裂缝评价。E-mail:zukewei1234@aliyun.com
  • 基金资助:
    国家科技重大专项(2016ZX05017);中国石化十条龙项目(P1802-1)

Development patterns of fractures in carbonate reservoirs in the 2nd member of Jialingjiang Formation, Puguang area, Sichuan Basin

Kewei Zu1,2(), Lingxiao Fan1, Bo Wang3, Dongsheng Cao2, Cong Guan2, Zhongchao Li1, Xiushen Cheng1   

  1. 1. Exploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Company, Zhengzhou, Henan 450018, China
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
    3. Experimental Center, CNOOC EnerTech-Drilling&Production Co., Tianjin 300452, China
  • Received:2019-04-16 Online:2020-12-28 Published:2020-12-09

摘要:

利用野外露头、岩心、薄片和测井资料,对四川盆地普光地区嘉陵江组二段(简称嘉二段)碳酸盐岩储层裂缝的参数特征、发育规律和控制因素开展综合分析。研究表明,普光地区嘉二段裂缝发育有北东-南西向、东西向、南北向和北西-南东向4组裂缝。其中北东-南西向为优势方位,裂缝以高角度裂缝为主,开度通常小于300 μm。裂缝孔隙度和渗透率计算结果表明,嘉二段裂缝的储集作用相对较弱,在储层中主要起到渗流通道的作用。垂向上,裂缝主要发育在嘉二段3个亚段膏岩下伏的白云岩段,嘉二中亚段裂缝最为发育。嘉二段储层裂缝的发育受构造、岩石力学层厚、岩性和成岩作用等因素控制。研究区现今水平最大主应力方位为近东西向,在开发过程中,东西向裂缝更容易优先开启,成为主要的渗流通道,同时北东-南西向裂缝作为优势发育方位易形成定向的高渗带。

关键词: 裂缝, 碳酸盐岩, 嘉陵江组, 普光地区, 四川盆地

Abstract:

The parameter characteristics, development pattern and controlling factors of fractures in carbonate reservoirs in the second member of the Jialingjiang Formation (Jia 2 member) in the Puguang area, Sichuan Basin, are analyzed through an integrated study of outcrop, core and thin section observations as well as logging data of the member.The results show that the member contains 4 sets of well-developed fractures of NE-SW-, E-W-, N-S- and NW-SE-trending.The dominant fractures of NE-SW strike are mainly those with a high dip-angle and an aperture normally less than 300 μm.The porosity and permeability calculation shows that the fractures serve as seepage channels rather than reservoiring space.Vertically, the fractures are mainly developed in the dolomite underlying the gyprock in each of the three sub-members, of which the middle sub-member has the most developed fractures.Factors such as the structure, rock mechanical stratigraphic thickness, lithology and diagenesis, control the development of the fractures.The present major principal stress is measured to be nearly E-W orientied, making the E-W striking fractures the most prone to be initiated as the chief flow channels in exploitation, and the NE-SW striking fractures of a preferred direction more likely to form high-permeability zones.

Key words: fracture, carbonate rock, Jialingjiang Formation, Puguang area, Sichuan Basin

中图分类号: