油气藏评价与开发 ›› 2020, Vol. 10 ›› Issue (5): 34-41.doi: 10.13809/j.cnki.cn32-1825/te.2020.05.005

• 页岩气勘探 • 上一篇    下一篇

页岩气低密度三维地震勘探方法适应性评估分析

刘厚裕()   

  1. 中国石化华东油气分公司,江苏 南京210019
  • 收稿日期:2020-02-19 出版日期:2020-10-26 发布日期:2020-09-24
  • 作者简介:刘厚裕(1963—),男,本科,高级工程师,主要从事非常规资源勘探开发地震勘探技术管理工作。地址:江苏省南京市建邺区江东中路375号金融城9号楼,邮编:210019。E-mail: njlhy1963@163.com
  • 基金资助:
    国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061)

Adaptability evaluation and analysis of low density 3D seismic exploration method for shale gas

LIU Houyu()   

  1. Sinopec East China Oil & Gas Company, Nanjing, Jiangsu 210019, China
  • Received:2020-02-19 Online:2020-10-26 Published:2020-09-24

摘要:

“两宽一高”三维地震勘探技术广泛应用于常规和非常规油气勘探。技术有效性和经济性是制约地震勘探的两个主要因素,尤其是非常规油气勘探,其经济性是主要的影响因素。以武隆地区常压页岩气三维地震勘探为例,介绍了页岩气低密度、经济性三维成功的做法,并且达到降低三维地震资料勘探成本、提高勘探效果的目的。结合与其类似的桃子荡地区常规三维地震勘探实例,着重对信噪比进行评估分析。指出了构造相对简单、区域性富集且具有强反射地震界面目的层的应用地质背景,性价比较高的低密度观测系统,能量强与信噪比高的单炮记录,及提高信噪比和高精度静校正的处理方法针对性的应用地震勘探技术是成功实现页岩气低密度三维关键。采用深井大药量饱和激发确保地震采集资料的能量和信噪比,提高有效炮的比率,以及现场管理方法和措施值得借鉴。其成功经验已在桂花和阳春沟两块三维地震勘探推广应用。

关键词: 低密度, 三维地震勘探, 常压页岩气, 饱和激发, 信噪比, 评估分析

Abstract:

3D seismic exploration technology with the mode of “Wide-azimuth, high-density and broadband” is widely used in the exploration of conventional and unconventional oil and gas. Technical effectiveness and economy are the two main factors restricting seismic exploration, especially unconventional oil and gas exploration(shale oil and gas, coalbed methane, etc.), whose economy is the main influencing factor. Taking 3D seismic exploration for the shale gas with normal pressure in Wulong as an example, the successful 3D method of shale gas with low density and economy is introduced, and the purpose of reducing the exploration cost of 3D seismic data and improving the exploration effect is achieved. Combined with the similar conventional 3D seismic exploration examples in Taozidang area, the S/N ratio is evaluated and analyzed emphatically. It is pointed out that the application geological background with relatively simple structure, regional enrichment and strong reflective seismic interface, low density observation system with high cost performance, single shot record with high energy and SNR, and methods of improving S/N ratio and high-precision static correction for seismic exploration are the keys to the success of low density 3D shale gas. The application of deep well and large dosage saturation excitation to ensure the energy and S/N ratio of seismic acquisition data, improve the ratio of effective seismic record ratio, and the method and measure of field management are worthy of reference. Its successful experience has been widely used in 3D seismic exploration in Guihua and Yangchungou.

Key words: low-density, 3D seismic, normal-pressure shale gas, saturate exploding, S/N(signal-to-noise) ratio, evaluation analysis

中图分类号: 

  • TE132