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

GAO Zhaopu

doi:10.13809/j.cnki.cn32-1825/te.2022.02.004

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Sedimentary micro-facies and gas bearing property of He2+3 Member in Shiguhao gas area, northern margin of Ordos Basin
Issue 2, Pages: 292-301(2022)
Published：2022
DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.004
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DOI：

GAO Zhaopu. Sedimentary micro-facies and gas bearing property of He2+3 Member in Shiguhao gas area, northern margin of Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2022, (2): 292-301. DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.004.

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。

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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references

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