致密气勘探

鄂尔多斯盆地北缘什股壕气区盒2+3段沉积微相及其含气性研究

  • 高照普
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  • 中国石化华北油气分公司勘探开发研究院,河南 郑州 450006
高照普(1989—),男,硕士,助理研究员,从事天然气开发地质研究工作。地址:河南省郑州市陇海西路199号中国石化华北油气分公司,邮政编码:450006。E-mail: gaozhaopu.2008@163.com

收稿日期: 2021-09-09

  网络出版日期: 2022-05-07

基金资助

中国石化科技部项目“鄂尔多斯盆地中国石化探区上古生界致密气富集规律与目标优选”(P20065-2)

Sedimentary micro-facies and gas bearing property of He2+3 Member in Shiguhao gas area, northern margin of Ordos Basin

  • Zhaopu GAO
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  • Exploration and Development Research Institute, Sinopec North China Oil and Gas Company, Zhengzhou, Henan 450006, China

Received date: 2021-09-09

  Online published: 2022-05-07

摘要

以东胜气田什股壕气区盒2+3段为研究对象,刻画该区沉积相类型及平面展布,开展沉积微相与天然气分布的关系研究。由于复杂的古地貌特征对沉积体系展布特征的影响,通过古地貌精细刻画,明确了沉积碎屑搬运通道及沉积体系展布空间。在岩心观察的基础上,归纳出14种岩相类型和5种岩相组合,识别出盒2+3段,发育了心滩、辫流水道和河漫沉积3种沉积微相。剖析典型井的垂向沉积序列,以粒度较粗的正粒序为主,形成单期大套厚层的含砾中粗砂岩。刻画出辫状河沉积相垂向及平面展布特征,砂体呈近南北向条带状展布,河道侧向迁移摆动频繁。结合储层物性参数,总结不同微相类型对储层物性的影响,分析含气储层在沉积微相中的分布规律,确定辫状河中心滩微相物性及含气性好,具有较大的天然气开发潜力。

本文引用格式

高照普 . 鄂尔多斯盆地北缘什股壕气区盒2+3段沉积微相及其含气性研究[J]. 油气藏评价与开发, 2022 , 12(2) : 292 -301 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.02.004

Abstract

Taking He2+3 Member in shiguhao gas area of Dongsheng gas field as the research object, the types and plane distribution of sedimentary facies in this area have been described, and the relation between sedimentary microfacies and natural gas distribution has been studied. Due to the influence of complex paleogeomorphic characteristics on the sedimentary system distribution, the transportation channel of sedimentary debris and the distribution space of sedimentary system mainly is defined by the description of paleogeomorphology. On the basis of core observation, 14 lithofacies types and 5 lithofacies associations are summarized, and three sedimentary microfacies of channel bar, braided channel and river flood deposition are identified in He2+3 Member. The vertical sedimentary sequence of typical wells is analyzed, which is dominated by the normal grain sequence with coarse grain size, forming a single-stage large set of thick gravelly medium-coarse sandstone. The vertical and plane distribution characteristics of braided river sedimentary facies are characterized. The sand body is distributed in a nearly north-south strip, and the river channel migrates and swings frequently laterally. Combined with the reservoir physical parameters, the influence of different microfacies on reservoir physical properties is summarized, the distribution of gas-bearing reservoirs in sedimentary microfacies is analyzed, and finally the braided river channel bar is proved to have good physical properties and gas-bearing properties, which has great natural gas development potential.

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