Controlling effects of sand body structural characteristics on oil reservoirs of Chang 81 oil layer in Jiyuan area
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摘要: 作为姬塬地区主力开发层系的长81油层组，其砂体的交错叠置关系严重影响该地区油藏分布规律的认识。为了研究长81油层组砂体结构特征及其对油藏分布的控制作用，立足于长81油层组的砂体形成机理，综合沉积、测井等资料划分砂体结构类型，刻画砂体的横向交错和纵向叠置关系，进而厘清砂体结构对油藏分布的控制作用。研究结果表明：姬塬地区的砂体结构可划分为4种类型，分别为叠合箱型、齿化钟型、孤立箱型和孤立指状型，其中叠合箱型砂体含油性好，是油藏主要储集体；齿化钟型和孤立箱型砂体顶底含油性差，中部含油性好且均匀；孤立指状型砂体物性和含油性均较差。该地区的砂体结构与有利区分布具有显著关系，叠合箱型砂体发育地区多为Ⅰ类有利区。研究成果可为姬塬地区长8油藏的精细勘探开发提供依据和方向。Abstract: As the main development strata in Jiyuan area, Chang 81 oil layer has a staggered superimposed relationship of sand bodies, which seriously affects the reservoir distribution in this area.The study on the structural characteristics of the sand bodies in Chang 81 oil layer and their control effects on reservoir distribution is carried out, which is beneficial to the continuous exploration and development in Jiyuan area. Based on the formation mechanism of sand bodies in Chang 81 oil layer, the sedimentary and logging data were combined to divide the structural types of sand bodies, and the relationship between transverse interlacing and longitudinal superposition of sand bodies was described. Further, the control effects of sand body structure on reservoir distribution were clarified. Results show that the sand body structure in Jiyuan area can be divided into four types, including superimposed box shape, toothed bell shape, isolated box shape and isolated finger shape. The superimposed-box-shape sand body has good oiliness and is the main reservoir body. The top and bottom of the toothed-bell-shape and isolated-box-shape sand body have poor oiliness, but the middle part of them has good and uniform oiliness. The isolated-finger-shape sand body's physical properties and oiliness are poorer. The sand body structure in this area is significantly related to the distribution of favorable reservoirs. Most of the superimposed-box-shape sand bodies are of type I favorable reservoir. The result can provide the basis and direction for delicate exploration and development of Chang 8 reservoir in Jiyuan area.
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Key words:
- Jiyuan area /
- pay set Chang 81 /
- sand body structure /
- sand body oilness /
- reservoir distribution
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图 1 鄂尔多斯盆地构造及研究区位置图
Figure 1. Structure of the Ordos Basin and location map of the study area
图 2 环312-里218井长81油层组砂体结构剖面图
(深度单位:m)
Figure 2. Huan 312 to Li 218 well Chang 81 sand body structure
图 3 耿73-耿191井长81油层组砂体结构剖面图
(深度单位:m)
Figure 3. Geng 73 to Geng 191 wells Chang 81 sand body structure
图 4 姬塬地区长811油层段砂体结构平面分布图
Figure 4. Plane distribution of the Chang 811 sand body structure in Jiyuan area
图 5 姬塬地区长812油层段砂体结构平面分布图
Figure 5. Plane distribution of the Chang 812 sand body structure in Jiyuan area
图 6 姬塬地区长813油层段砂体结构平面分布图
Figure 6. Plane distribution of the Chang 813 sand body structure in Jiyuan area
图 8 砂体结构与储层含油性关系图
Figure 8. Relationship between sand body structure and reservoir oiliness
图 9 砂体结构与产油量之间的关系
Figure 9. Relationship between sand body structure and oil production
图 10 长812油层段砂体结构与油藏有利区分布关系图
Figure 10. Relationship between the Chang 812 sand body structure and distribution of the favorable area of the reservoir
表 1 姬塬地区长8储集层砂体结构类型及特征
Table 1. Types and characteristics of the sand body structure of Chang 8 oil layer in Jiyuan area
表 2 研究区长8储集层有利目标区评价标准
Table 2. Evaluation standard of the target area for Chang 8 oil layer in Jiyuan area
划分依据 Ⅰ类有利区 Ⅱ类有利区 Ⅲ类有利区 沉积相 沉积微相 水下分流河道主河道 水下分流河道主河道 水下分流河道次河道 砂体厚度/m 8~12 8~12 >8 成岩相 绿泥石膜粒间孔相
长石溶孔相
弱压实粒间孔相长石溶孔相
弱压实粒间孔相长石溶孔相
弱压实粒间孔相
伊利石胶结相储层条件 储集性能 面孔率>1.5%、
排驱压力 < 1.0 MPa、
中值压力 < 3.0 MPa面孔率>1.5%、
1.0 MPa < 排驱压力 < 2.0 MPa、
3.0 MPa < 中值压力 < 6.0 MPa面孔率>1.0%、
排驱压力 < 2.0 MPa、
中值压力 < 6.0 MPa物性 孔隙度>9%、渗透率>0.5×10-3 μm2 孔隙度>8%、渗透率>0.3×10-6 μm2 孔隙度>8%、渗透率>0.3×10-3 μm2 储层类别 Ⅰ、Ⅱ类 Ⅱ类 Ⅱ、Ⅲ类 油层厚度/m >8 >6 >4 储能系数(Por·h) >90 >60 >60 试油产量 多口井获工业油流，多个区块已经投入开发 多口井获工业油流 获工业油流 含油富集区落实程度 落实 较落实 待落实 
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