石油学报 ›› 2015, Vol. 36 ›› Issue (6): 673-687.DOI: 10.7623/syxb201506004

• 地质勘探 • 上一篇    下一篇

塔里木盆地克深2气田储层构造裂缝多方法综合评价

王珂1, 张惠良1, 张荣虎1, 戴俊生2, 王俊鹏1, 赵力彬3   

  1. 1. 中国石油杭州地质研究院 浙江杭州 310023;
    2. 中国石油大学地球科学与技术学院 山东青岛 266580;
    3. 中国石油塔里木油田公司勘探开发研究院 新疆库尔勒 841000
  • 收稿日期:2014-12-01 修回日期:2015-03-28 出版日期:2015-06-25 发布日期:2015-08-06
  • 作者简介:王珂,男,1987年7月生,2009年获中国石油大学(华东)学士学位,2014年获中国石油大学(华东)博士学位,现为中国石油杭州地质研究院工程师,主要从事储层地质及构造地质研究工作。Email:wangk_hz@petrochina.com.cn
  • 基金资助:

    国家重大科技专项(2011ZX05015-002,2011ZX05046-003)资助。

Comprehensive assessment of reservoir structural fracture with multiple methods in Keshen-2 gas field, Tarim Basin

Wang Ke1, Zhang Huiliang1, Zhang Ronghu1, Dai Junsheng2, Wang Junpeng1, Zhao Libin3   

  1. 1. PetroChina Hangzhou Research Institute of Geology, Zhejiang Hangzhou 310023, China;
    2. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    3. Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Xinjiang Korla 841000, China
  • Received:2014-12-01 Revised:2015-03-28 Online:2015-06-25 Published:2015-08-06

摘要:

构造裂缝是改善克深2气田低渗透砂岩储层物性的重要因素,对构造裂缝的分布特征进行分析有利于提高钻井成功率,综合采用岩心描述、数值模拟、主曲率法、二元法以及天然气产能数据,对克深2气田巴什基奇克组的构造裂缝进行了多方法综合评价。结果表明:克深2气田的构造裂缝以直立和高角度的剪切裂缝为主,断层附近多发育密集网状缝,且具有较高的充填程度;深度越大,构造裂缝的分布越趋于分散;背斜高部位的构造裂缝线密度较低,但开度和孔隙度等物性参数较高,构造裂缝的整体发育程度较强,且充填程度较低,通常具有较高的产能,背斜翼部和构造低部位则与之相反;鞍部构造裂缝也较发育,但受较高的充填程度或其他未知因素的影响,天然气产能较低。研究还得出,构造裂缝密度并未考虑裂缝的开度,因此在油气田开发中单纯根据构造裂缝密度值来判断构造裂缝发育有利区并不合适,在粗略评价构造裂缝发育程度时,可采用构造裂缝的孔隙度或渗透率,精细评价时还要考虑裂缝产状、延伸距离、连通性和有效性等因素进行综合分析。构造裂缝发育程度的系统化和定量化综合评价仍然是一个有待攻关的前沿课题。

关键词: 储层构造裂缝, 岩心, 数值模拟, 主曲率, 二元法, 产能, 综合评价

Abstract:

Structural fractures are a significant factor for improving the physical properties of low-permeability sandstone reservoirs in Keshen-2 Gas Field. An analysis on the distribution characteristics of structural fractures is beneficial to enhance the success rate of well drilling. Therefore, the structural fractures of Bashijiqike Formation in Keshen-2 Gas Field was comprehensively evaluated based on core description, numerical simulation, principal curvature method, binary method and natural gas production data, multi-method comprehensive assessment. The results show that structural fractures in Keshen-2 Gas Field are dominated by the upright shearing fractures with high angles. Intensive netted fractures are mainly developed adjacent to faults with high filling degree. The greater the depth is, the more scattered the distribution of structural fracture will be. At the high positions of anticline, structural fractures have low linear density, but with higher physical properties such as opening and porosity, indicating the high overall development degree of structural fractures with low filling degree and large natural gas production capacity. The situation in the wings of anticline is opposite to the low positions of the structure. Structural fractures are also relatively developed in the saddle, where the natural gas production capacity is low due to high filling degree or other unknown factors. Moreover, the research indicates that fracture opening is not considered in terms of the density of structural fracture. Thus, it is not suitable to determine the favorable development zones of structural fractures only according to the density of structural fractures in the development of oil and gas fields. The porosity or permeability of structural fractures can be used for roughly evaluating the development degree of structural fracture, while fracture occurrence, extended distance, connectivity, effectiveness and other factors should be considered for comprehensive analysis in the detailed evaluation. Comprehensive systematical and quantitative assessment on the development degree of structural fracture is still a front subject to be studied.

Key words: reservoir structural fracture, core, numerical simulation, principal curvature, two-factor method, production, comprehensive assessment

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