Development Scale and Reservoir Characteristics of Sand Bodies in the Qian 5 Member of the Shiqianfeng Formation of the Shenmu Gas Field in the Ordos Basin
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摘要:
石千峰组作为鄂尔多斯盆地二叠系区域顶部天然气储集层，具有砂岩厚度大、分布广的特点。在露头、钻测井资料与岩心沉积相分析基础上，利用露头测量法、经验公式法以及密井网解剖法，对千5段开展砂体发育规模评价研究，结合显微薄片、扫描电镜、压汞、核磁等分析手段进行千5段储层特征研究及分类评价，为后续高精度开发提供线索。研究认为，神木地区千5段为辫状河三角洲平原沉积，以辫状分流河道与洪泛平原亚相为主，局部发育洪泛越岸砂沉积；沉积期辫状河道平均水深为5～6 m，千5上亚段聚合河道宽度为800～
1200 m，千5下亚段聚合河道宽度主体为1200 ～1600 m。形成厚层岩屑砂岩、长石岩屑砂岩和岩屑长石砂岩储层，具有高岩屑含量、高原生粒间孔含量的特点，表现为4类砂岩储层：Ⅰ类微米级裂缝孔隙型；Ⅱ类微米-纳米级联通孔隙型；Ⅲ类纳米–微米级连通–孤立孔隙型；Ⅳ类纳米级孤立孔隙型。千5段砂岩浊沸石胶结作用局部富集，对寻找高孔隙度、高渗透率储层创造了潜在的物质条件。Abstract:The Shiqianfeng Formation, as the top natural gas reservoir in the Permian of the Ordos Basin, has the characteristics of large sandstone thickness and wide distribution. Based on the analysis of outcrop, drilling and logging data, and core sedimentary facies, the outcrop measurement method, empirical formula method, and dense well network dissection method were used to evaluate the development scale of sand bodies in the Qian5 member. Combining microscopic thin sections, scanning electron microscopy, mercury intrusion, nuclear magnetic resonance, and other analytical methods, the study and classification evaluation of reservoir characteristics in the Qian5 member are conducted, providing clues for subsequent high-precision development. Research suggests that the Qian5 section of the Shenmu area is a braided river delta plain deposit, mainly composed of braided distributary channels and flood plain subfacies, with locally developed flood crossing sand deposits. During the sedimentation period, the average depth of braided river channels is 5-6 m, with a width of 800-
1200 m in the upper section of Qian5 and a width of1200 -1600 m in the lower section of Qian5. Thick layers of lithic sandstone, feldspathic lithic sandstone, and lithic feldspathic sandstone reservoirs were formed, characterized by high rock debris content and high intergranular pore content. It is manifested as four types of sandstone reservoirs: type I, micron level fracture pore type; Class II micron-nano interconnected pore type; Class III nano-micron level connected to isolated pore type; Class IV nanoscale isolated pore type. The local enrichment of laumontite in the sandstone of Qian5 member has created potential material conditions for searching for reservoirs with high porosity and permeability.-
Keywords:
- Ordos basin /
- Shiqianfeng Formation /
- sedimentary facies /
- researvoir /
- Shenmu oilfield
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图 1 神木气田区域位置图（据赵龙梅等，2023修改）与千5段综合柱状图
Figure 1. Location map of Shenmu las field and comprehensive histogram of Qian5 section
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图 2 神木地区石千峰组千5段砂岩与泥岩颜色发育特征
发育3种类型岩石颜色组合：砖红色为主（a～c）、灰绿色为主（d～f）、混积色（g～i）；a. 砖红色粉砂质泥岩，米160井，1 877.0 m；b. 浅褐灰色含细砾中粗砂岩，双56井，2 298.76 m； c. 浅褐色夹灰色泥质中粗砂岩，米35井，2 000.8 m；d. 浅绿灰色泥砾粗砂岩，米161井，2 298.05 m；e. 浅绿灰色中细砂岩，米44井，1 875.2 m；f. 灰绿色泥质细砂岩，米120井，2 120.8 m；g. 砖红色粉砂质泥岩，米160井，1 877.1 m；h. 浅褐灰色具平行层理粗砂岩，府2，1 728.1 m；i. 褐灰色向浅绿灰色粗砂岩过渡，米160井，1 872.5 m
Figure 2. Color characteristics of sandstone and mudstone in the Qian5 member of Shiqianfeng Formation in the Shenmu area
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图 3 韩城遽水河剖面石千峰组千5段露头聚合河道砂体刻画
a. 韩城遽水河石千峰组聚合河道露头；b. 韩城遽水河石千峰组聚合河道露头河道砂体刻画
Figure 3. Characterization of the aggregate channel sand body in the Qian5 Member of the Shiqianfeng Formation of the Qushui river section in Hancheng
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图 4 神木气田双44井区EW向开发井剖面砂体刻画
Figure 4. Sand body characterization of the east-west well profile in Shuang44 well area of Shenmu Gas Field
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图 5 神木气田石千峰组千5段密井网砂体刻画数据分布特征
Figure 5. Distribution characteristics of dense well network sand body characterization data in the Qian5 section of the Shiqianfeng Formation in Shenmu Gas Field
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图 6 神木气田石千峰组千5段砂岩成分三角图
Ⅰ.石英砂岩；Ⅱ.长石石英砂岩；Ⅲ.岩屑石英砂岩；Ⅳ.长石砂岩；Ⅴ.岩屑长石砂岩；Ⅵ.长石岩屑砂岩；Ⅶ：岩屑砂岩
Figure 6. Triangle diagram of sandstone composition in the Qian5 member of the Shiqianfeng Formation in Shenmu Gas Field
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图 7 神木地区石千峰千5段填隙物含量特征
Figure 7. Characteristics of interstitial material content in Shiqianfeng Qian5 member of Shenmu area
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图 9 神木地区主要储集层段砂岩物性特征对比
a.孔隙度箱状图，箱体为25%～75%孔隙度分布区间，标注数字为孔隙度均值；b.渗透率箱状图，菱形箱体为25%～75%渗透率分布区间，标注数字为孔隙度均值和中位值
Figure 9. Characteristics of sandstone porosity and permeability in the main reservoir sections of the Shenmu area
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图 8 神木地区千5段砂岩孔隙充填特征
a.未充填原生粒间孔，1 871.4 m，米44井（扫描电镜）；b.黏土矿物晶间孔和疑似颗粒溶孔，2 032.6 m，双118井（扫描电镜）；c.长石颗粒溶孔，1 993.5 m，榆88井（扫描电镜）；d.绿泥石膜与硅质胶结物全充填原生粒间孔，米161井，1 737.3 m（单偏光）；e.绿泥石完全充填原生粒间孔，双118井，2 035.6 m（单偏光）；f.原生粒间孔被铁泥质全充填，米44井，1 874.1 m（单偏光）；g.高岭石半充填长石溶孔，米161井，1 742.7 m（单偏光）；h.接触式硅质胶结作用，残留部分原生粒间孔，米44井，1 866.4 m（单偏光）；i.镶嵌式钙质胶结物全充填原生粒间孔，米165井，2 267 m（单偏光）； j.长石颗粒溶孔被方解石胶结物充填，神118井，2 037.2 m（单偏光）；k.沸石胶结物半充填原生粒间孔，发育沸石溶孔，府2井，1 527 m（单偏光）；l.浊沸石胶结原生粒间孔，发育少量沸石溶孔，府2井，1 530 m（单偏光）
Figure 8. Pore filling characteristics of sandstone in the Qian5 member of the Shenmu area
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图 10 神木地区石千峰组千5段砂岩储层孔隙大小分布特征
Figure 10. Pore size distribution characteristics of sandstone reservoirs in the Qian5 member of the Shiqianfeng Formation in the Shenmu area
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图 11 神木地区石千峰组千5段压汞储层分类特征
Ⅰ类样品：米44井，1 872.8 m；Ⅱ类样品：榆88井-1，1 994.2 m；Ⅲ类样品：府2井-4，1 527.8 m；Ⅳ类样品：米44井-10，1 875.3 m
Figure 11. Classification characteristics of mercury injection reservoirs in the Qian5 member of the Shiqianfeng Formation in the Shenmu area
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图 12 神木地区千5段砂岩埋藏演化史及成岩作用发育特征
Figure 12. Burial evolution history and diagenetic development characteristics of sandstone in the Qian5 section of the Shenmu area
表 1 砂体宽度与聚合河道带计算数据表
Table 1 Calculation data for the width of single sand body and aggregate channel sand body
单砂体厚度（m） 单砂体宽度（m） 聚合河道带宽度（m） 厚度频率（次） 0～2 0～100 0～240 1 969 2～4 100～350 240～700 2900 4～6 350～750 700～ 1300 1776 6～8 750～ 1250 1300 ～2 0001037 8～10 1250 ～1 9002 000～ 2800 525 ＞10 ＞1 900 ＞ 2800 277 
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