易变形组分对致密砂岩储层的控制机理——以鄂尔多斯盆地大牛地气田H井区山西组为例

The control mechanism of deformable compositions on tight sandstone reservoirs: An example of the Shanxi Formation in the H well area of the Daniudi gas field in the Ordos Basin

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DOI 10.20086/j.cnki.yskw.2025.3124
刊名
Acta Petrologica et Mineralogica
年,卷(期) 2025, 44(1)
作者
作者单位

1. 重庆科技大学石油与天然气工程学院, 重庆 401331;
2. 西南石油大学地球科学与技术学院, 四川 成都 637001;
3. 复杂油气田勘探开发重庆市重点实验室, 重庆 401331;
4. 中国石化华北油气分公司勘探开发研究院, 河南 郑州 450006

摘要
碎屑组分是影响致密砂岩储层成岩作用和物性的关键因素之一。为了查明易变形组分对储层的控制机理,以大牛地气田H井区山西组为例,通过岩石薄片显微观察和统计,结合物性特征,分析易变形组分对成岩作用的控制作用,进而探讨其对储层的控制机理。研究结果显示,山西组的塑性组分为凝灰质杂基,半塑性组分包括凝灰岩、板岩、千枚岩、片岩和泥岩岩屑。易变形组分主要通过压实和溶蚀作用控制储层,压实减孔率与易变形组分含量呈现正相关,其中凝灰质杂基对压实减孔的影响相对明显;溶蚀增孔率与半塑性含量呈负相关,与凝灰质杂基含量呈现弱的正相关。易变形组分含量与储层物性总体呈负相关关系,其中凝灰质杂基对储层物性的破坏作用相对较弱。易变形组分在压实过程中加剧了储层的致密化,同时降低了成岩流体的流通性,但凝灰质杂基压实后可完全充填粒间孔隙,影响更为显著。凝灰质杂基作为溶蚀的溶质,有利于改善储层物性;当凝灰质杂基含量介于8%~12%之间时,最有利于形成质量较好的储层。
Abstract
The detrital composition is one of the key factors affecting the diagenesis and reservoir physical properties of tight sandstone reservoirs. In order to find out the control mechanism of the deformable compositions on the reservoir, taking the Shanxi Formation in the H well area of the Daniudi gas field as an example, through microscopic observation and statistics of rock thin section, combined with the physical properties, we analyse the controlling effect of deformable compositions on diagenesis, and then discuss their control and mechanism on the reservoir. The results show that the plastic composition of the Shanxi Formation is a tuffaceous matrix, and the semi-plastic compositions include tuff, slate, phyllite, schist, and mudstone detritus. The deformable components mainly control the reservoir through compaction and dissolution, and the compaction pore reduction rate is positively correlated with the content of deformable compositions, in which the effect of tuffaceous matrix on the compaction pore reduction is relatively obvious; the dissolution pore enhancement rate is negatively correlated with the content of semi-plasticity and weakly positively correlated with the content of tuffaceous matrix. The content of deformable compositions is negatively correlated with reservoir physical properties, with the fully plastic tuffaceous matrix having a weaker destructive effect on reservoir physical properties. The deformable compositions exacerbate the densification of the reservoir during compaction, and at the same time reduce the flow of diagenetic fluids, but the tuffaceous matrix completely fill the intergranular pore space after compaction, and the effect is more significant. The tuffaceous matrix as the solute of intergranular dissolution, its dissolution is also conducive to the improvement of the physical properties of the reservoir; when the content of the tuffaceous matrix ranges between 8%~12%, it is the most conducive to the formation of better quality reservoirs.
关键词
大牛地气田;山西组;致密砂岩;易变形组分;成岩作用;储层物性
KeyWord
Daniudi gas field; Shanxi Formation; tight sandstone; deformable compositions; diagenesis; reservoir physical properties
基金项目
页码 128-140
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王桥,张薇,姜楠,瞿雪姣*,雷涛,罗龙,蔡鑫勇,王佳,张铭凯,谭先锋. 易变形组分对致密砂岩储层的控制机理——以鄂尔多斯盆地大牛地气田H井区山西组为例 [J]. 岩石矿物学杂志. 2025; 44; (1). 128 - 140.

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