岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 98–103.doi: 10.3969/j.issn.1673-8926.2015.05.016

• 油气地质 • 上一篇    下一篇

徐家围子断陷沙河子组致密气地质甜点综合评价

张大智,张晓东,杨步增   

  1. 中国石油大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆 163712
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 第一作者:张大智( 1981- ),男,博士,高级工程师,主要从事致密气综合地质研究工作。 地址:( 163712 )黑龙江省大庆市让胡路区大庆油田勘探开发研究院天然气室。 E-mail : zdz-007@163.com 。
  • 基金资助:

    中国石油天然气股份公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(编号: 2012E-2603-02 )资助

Comprehensive evaluation of geological sweet point of tight gas of Shahezi Formation in Xujiaweizi fault depression

Zhang Dazhi, Zhang Xiaodong, Yang Buzeng   

  1.  Research Institute of Exploration and Development , PetroChina Daqing Oilfield Company Ltd. ,Daqing 163712 , Heilongjiang , China
  • Online:2015-09-26 Published:2015-09-26

摘要:

致密砂岩气是非常规天然气勘探的重点领域,徐家围子断陷沙河子组具备形成大面积致密砂岩气藏的地质条件。 针对沙河子组发育于断陷盆地,具有物源近、相变快及非均质性强的特点,初步形成了层序研究定前景、源岩研究定潜力、储层研究定品质、综合研究定区带、甜点研究定井位的致密气地质甜点综合评价思路。研究认为:安达地区为首选有利区,埋藏相对较浅的 Sq3 和 Sq4 的扇三角洲前缘水下分流河道、席状砂以及辫状河三角洲前缘水下分流河道、河口砂坝等相带是好储层发育区。结合精细地震解释及叠前反演,在安达地区预测甜点体 12 个,有效指导了勘探部署,实现了沙河子组致密气的勘探突破。

关键词: 隐蔽油气藏, 分布规律, 成藏模式, 主控因素, 蠡县斜坡

Abstract:

The tight sandstone gas prospecting is a key area of unconventional oil and gas exploration. Shahezi Formation in Xujiaweizi fault depression possesses a geological condition for forming large-area tight gas reservoir. The Shahezi Formation developed in faulted basin, and it is close to the source with features of fast phase change and strong heterogeneity. The following comprehensive evaluation methods for tight gas sweet point were formed preliminarily: sequence study determines its prospective, source rock fixes its potential, reservoir study identifies grade, comprehensive study confirms zone, and sweet point study makes well location. It is considered that Anda area is the preferred favorable zone. The facies such as underwater distributary channel and sheet sand of fan delta front, and underwater distributary channel and channel mouth bar of braided river delta front are favorable development zone for reservoirs. Combined fine seismic interpretation with prestack inversion, 12 sweet point bodies were forecasted in Anda area, which provides an effective guidance for exploration and deployment, and makes breakthrough of tight gas exploration of Shahezi Formation.

Key words: subtle reservoir, hydrocarbon reservoir distribution, hydrocarbon accumulation model, main controlling factors, Lixian slope

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