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

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

摘要/Abstract

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。

关键词: 古地貌, 岩相, 沉积序列, 沉积微相, 含气性

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.

Key words: paleogeomorphic, lithofacies, sedimentary sequence, sedimentary micro-facies, gas-bearing property

中图分类号:

TE122

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.

GAO Zhaopu. Sedimentary micro-facies and gas bearing property of He2+3 Member in Shiguhao gas area, northern margin of Ordos Basin[J]. Reservoir Evaluation and Development, 2022, 12(2): 292-301.

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岩性		岩相类型	代码	特征	沉积相
砾岩	牵引流	正砾岩相	Gms	颗粒支撑、砂质充填、层理发育、砾石定向	辫流水道
	洪水泥石流	副砾岩相	Gmms	杂基支撑;泥、砂、砾混杂堆积	辫流水道
	洪水泥石流	含砾粗砂岩	Scfg	含砾粗砂,砾石含量大于15 %,常有漂砾;正反韵律,递变层理	心滩
中粗砂岩	牵引流	块状层理粗砂岩相	Sgm	层理构造不明显、牵引流中高水流能量的特征	心滩
		块状层理粗砂岩相	Sgm	平行层理、牵引流高水流能量特征
		平行层理中粗砂岩相	Sp	平行层理、牵引流高水流能量特征
		平行层理中粗砂岩相	Sp	槽状交错层理发育,主要反映牵引流中高水流能量的特征	辫流水道、心滩顶部
		槽状交错层理中粗砂岩相	St	槽状交错层理发育,主要反映牵引流中高水流能量的特征
		板状交错层理中粗砂岩相	Spl	板状交错层理,牵引流中高水流能量
粉细砂岩（牵引流）		平行层理中细砂岩相	Sh	高流态流体越过心滩顶部,使得沙丘平面迁移,一般存在于垂向加积作用形成的心滩中	辫流水道、心滩顶部
		块状层理细砂岩相	Sfm	层理不明显,以细砂岩为主,中低水流快速沉积	辫流水道、心滩顶部
		波状—水平层理粉细砂岩相	Sfw、Sfh	泥质含量较高、波状层理、部分位置发育水平层理,反映低水流能量的特征	辫流水道、河漫沉积
粉砂岩相		水平层理泥质粉砂岩相	Fh	水平层理,水动力较弱	辫流水道、河漫沉积
		沙纹层理粉砂岩、泥质粉砂岩相	Fl	沙纹层理,水动力弱	河漫沉积
		块状层理粉砂岩、泥质粉砂岩相	Fm	块状层理,水动力弱	河漫沉积
泥岩		泥岩相	M	深灰色、褐色,页理不发育,部分泥岩较为破碎	河漫沉积

沉积微相	盒2-1		盒2-2		盒3-1		盒2+3
沉积微相	孔隙度（%）	渗透率（10^-3μm²）	孔隙度（%）	渗透率（10^-3μm²）	孔隙度（%）	渗透率（10^-3μm²）	孔隙度（%）	渗透率（10^-3μm²）
辫流水道	7.75	3.32	5.69	5.01	7.81	5.18	7.08	4.50
心滩	11.87	4.36	10.37	4.78	11.83	5.29	11.36	4.81
河漫沉积	1.45	0.27	1.02	0.32	0.66	0.64	1.04	0.41