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.-
Key words:
- Ordos basin /
- Shiqianfeng Formation /
- sedimentary facies /
- researvoir /
- Shenmu oilfield
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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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