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现代地质 ›› 2021, Vol. 35 ›› Issue (04): 1024-1032.DOI: 10.19657/j.geoscience.1000-8527.2021.055

• 油气勘探与开发 • 上一篇    下一篇

湘西北HY1井下寒武统牛蹄塘组页岩储层可压性评价

姜生玲1(), 周庆华2, 蒋礼宏2, 姬安召1, 杨日丽1, 朱秀兰1, 李彦举1   

  1. 1.陇东学院 能源工程学院, 甘肃 庆阳 745000
    2.中国华电集团清洁能源有限公司 勘探开发事业部,北京 100160
  • 收稿日期:2020-12-20 修回日期:2021-03-15 出版日期:2021-08-10 发布日期:2021-09-08
  • 作者简介:姜生玲,女,博士,副教授,1984年出生,矿产普查与勘探专业,主要从事非常规油气勘探及评价方面的研究工作。Email: move824@163.com
  • 基金资助:
    国家科技重大专项(2016ZX05034004-004);陇东学院2020博士基金计划项目(XYBY202012)

Fracability Evaluation of Shale Reservoir in the Lower Cambrian Niutitang Formation of Well HY1, Northwestern Hunan

JIANG Shengling1(), ZHOU Qinghua2, JIANG Lihong2, JI Anzhao1, YANG Rili1, ZHU Xiulan1, LI Yanju1   

  1. 1. School of Energy Engineering, Longdong University, Qingyang,Gansu 745000, China
    2. Oil and Gas Exploration and Production Branch, China HuaDian Green Energy Co.Ltd., Beijing 100160,China
  • Received:2020-12-20 Revised:2021-03-15 Online:2021-08-10 Published:2021-09-08

摘要:

为系统深入研究湘西北地区下寒武统牛蹄塘组页岩储层可压裂性,以HY1井为依托,通过密集取心采样、实验测试分析、测井综合解释等多种方法手段,系统分析了牛蹄塘组页岩储层有机地球化学特征、储集物性、裂缝发育特征、脆性矿物组成、岩石力学性质,进而探讨了牛蹄塘组富有机质页岩可压裂性。结果表明:HY1井牛蹄塘组有机碳含量高(0.25%~13.3%),富有机质页岩发育于牛蹄塘组下部,厚约65 m;富有机质页岩段构造缝密度低(0.27~1.21条/m),页理缝发育;矿物脆性指数高(17.7%~86.4%)、静态杨氏模量大(37~62 GPa)、静态泊松比较低(0.14~0.26)、两相水平压力差异系数较大(0.21~0.54)。总体上,牛蹄塘组页岩脆性好,岩石强度大,有利于压裂改造,但大量页理缝的存在增加了裂缝复杂度的同时,对压裂缝产生一定不利影响,且两相水平压力差较大,易形成双翼缝。因此,压裂设计时要综合考虑页理缝可能造成的漏失和对裂缝高度及长度延伸的影响。

关键词: 湘西北, HY1井, 牛蹄塘组, 页岩储层, 可压性

Abstract:

In order to evaluate the fracability of the Lower Cambrian Niutitang Formation (Fm.) shale reservoir in northwestern (NW) Hunan, we took the well HY1 as the research target.Through intensive core sampling, experimental analysis, integrated logging interpretation and other methods, the characteristics of organic carbon content, reservoir physical property, fracture characteristics, brittle mineral compositions, and rock mechanic properties were systematically analyzed, and the shale reservoir fracability further discussed. The results show that the Niutitang Formation in well HY1 is featured by high organic carbon content (0.25% to 13.3%, average 2.91%), and the organic-rich shale developed in the lower Niutitang Formation is 65 m thick. Fractures are less developed in organic-rich shale with the low density (0.27 to 1.21pieces/m), but shale-bedding fractures are developed. The Niutitang Fm. shale is also featured by high mineral brittleness index (17.7% to 86.4%), high static Young’s modulus (37 to 62 GPa), low static Poisson’s ratio (0.14 to 0.26), and high two-phase horizontal pressure difference coefficient (0.21 to 0.54). Overall, the Niutitang Fm. shale reservoir is favorable for fracturing with high brittleness and rock strength, yet the existence of a large number of shale bedding fractures increases the fracture complexity, and give certain negative impact on fracture generation. The double wing fracture is easy to form due to the high two-phase horizontal pressure difference. Therefore, the leakage caused by shale bedding fractures and the influence on fracture height and length extension should be considered comprehensively in fracturing design.

Key words: northwestern Hunan, well HY1, Niutitang Formation, shale reservoir, fracability

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