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天然气地球科学 ›› 2019, Vol. 30 ›› Issue (10): 1439–1450.doi: 10.11764/j.issn.1672-1926.2019.06.006

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地致密砂岩储层孔喉分布特征及其差异化成因

王伟1(),朱玉双2(),余彩丽3,赵乐3,陈大友4   

  1. 1. 榆林学院化学与化工学院，陕西 榆林 719000
    2. 西北大学地质学系，陕西 西安 710069
    3. 长庆油田分公司第一采油厂，陕西 延安 716099
    4. 兰州城市学院，培黎石油工程学院, 甘肃 兰州 730070
  • 收稿日期:2019-03-20 修回日期:2019-06-27 出版日期:2019-10-10 发布日期:2019-11-06
  • 通讯作者: 朱玉双 E-mail:283465227@qq.com.;yshzhu@nwu.edu.cn.
  • 作者简介:王伟（1988-），男，陕西西安人，讲师，博士，主要从事油气田开发地质研究. E-mail：283465227@qq.com.
  • 基金资助:
    榆林学院博士科研启动基金(18GK22);陕西省科技资源开发共享平台项目(2019PT-18)

Pore size distribution of tight sandstone reservoir and their differential origin in Ordos Basin

Wei Wang1(),Yu-shuang Zhu2(),Cai-li Yu3,Le Zhao3,Da-you Chen4   

  1. 1. School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China
    2. Department of Geology, Northwest University, Xi’an 710069, China
    3. Oil Production Plant No. 1 of Changqing Oilfield Company, PetroChina, Yan’an 716099, China
    4. Bailie School of Petroleum Engineering, Lanzhou City University, Lanzhou 730070, China
  • Received:2019-03-20 Revised:2019-06-27 Online:2019-10-10 Published:2019-11-06
  • Contact: Yu-shuang Zhu E-mail:283465227@qq.com.;yshzhu@nwu.edu.cn.

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摘要：

致密砂岩中广泛发育的微纳米级孔喉体系是致密砂岩储层与常规砂岩储层的本质区别，也是影响致密油藏渗流特征及开发效果的主要因素。利用铸体薄片、扫描电镜、恒速压汞等方法，对鄂尔多斯盆地姬塬地区长6段、长7段储层的孔喉类型及分布特征进行了分析对比，并对其差异性成因进行了探讨。结果表明：长6段储层孔隙类型以剩余粒间孔为主，喉道多为压实成因，孔隙较喉道发育。长7段储层孔隙类型以长石溶孔为主，喉道多为溶蚀成因，喉道较孔隙发育。2个层位孔隙半径分布范围及平均值相近，长6段储层喉道半径分布范围及平均值明显大于长7段储层，其物性好于长7段储层。长6段储层为三角洲沉积，埋深较浅，较高的绿泥石膜含量和较低的压实强度使其较好地保持了原始沉积孔隙空间，而溶蚀作用又进一步扩大了孔隙空间。长7段储层为湖泊沉积，埋深较大，压实作用和胶结作用强烈，原始沉积孔隙空间被大量挤压，后期虽发生强烈的溶蚀作用，但溶蚀成因喉道连通性和渗流能力明显低于压实成因喉道，溶蚀作用虽能增大储集空间，但无法显著提高渗流能力。因此，连续沉积的长6段、长7段储层渗透率存在显著差异。

关键词: 鄂尔多斯盆地, 致密储层, 微观孔隙结构, 恒速压汞, 溶蚀作用

Abstract:

The micro-nano pore throat system widely developed in tight sandstone is the essential difference between tight sandstone reservoir and conventional sandstone reservoir, and is also the main factor affecting the seepage characteristics and development effect of tight sandstone reservoir. This thesis analyzed the pore-throat types and distributions of Chang6 and Chang7 reservoirs in Jiyuan area of Ordos Basin, and discussed the original causes of them by cast section, SEM, and constant-rate mercury injection. The results showed that: The pore type of Chang6 reservoir is predominantly residual intergranular pores, and the throats are mostly compacted, the pore of Chang6 is more developed than throat. The pore type of Chang7 reservoir is mainly feldspar solution pores, and the throat is mostly dissolution, the throat of Chang7 is more developed than pore. The pore radius distribution range and average value of Chang6 reservoir are similar to those of Chang7 reservoir. The distribution range and average value of throat radius of Chang6 reservoir are obviously larger than that of Chang7 reservoir, and the physical property of Chang6 reservoir is better than that of Chang7 reservoir. The Chang6 reservoir is located in delta sediments with shallow burial depth. The high chlorite membrane content and low compaction strength of Chang6 reservoir make it better to maintain the original sedimentary pore space, and the dissolution further enlarges the pore space. Chang7 reservoir is located in lacustrine sediments with a large burial depth. The compaction and cementation of Chang7 reservoir are strong, and the original sedimentary pore space is massively compressed. Although dissolution occurs in the later stage strongly, the connectivity and seepage capacity of the throat of dissolution origin are lower than those of compaction origin. Dissolution can increase the reservoir space, but it cannot significantly improve the seepage capacity. Therefore, there is a significant difference in permeability of the two successive layers.

Key words: Ordos Basin, Tight sandstone reservoir, Microscopic pore structure, Constant-rate mercury injection, Dissolution

中图分类号: 

  • TE122.1

图1

研究区地质构造（a）及地层特征（b）（研究区构造位置据文献[29]，修改；地层柱状图据文献[30]，修改）"

表1

姬塬地区长6段、长7段储层砂岩成分统计"

层位碎屑含量/%填隙物/%统计样数/个
石英长石岩屑
长6段29.4738.5018.6613.33725
长7段28.6834.5419.5615.36227

图2

姬塬地区长6段、长7段储层砂岩成分柱状图"

表2

姬塬地区长6段、长7段储层填隙物成分统计"

层位黏土矿物/%碳酸盐矿物/%硅质/%其他/%
高岭石伊利石绿泥石铁方解石铁白云石
长6段3.001.522.863.750.471.000.73
长7段2.144.041.633.361.890.951.35

图3

姬塬地区长6段、长7段储层填隙物成分柱状图"

表3

姬塬地区长6段、长7段储层孔隙类型统计"

层位不同孔隙类型面孔率/%总面孔率/%

统计井数

/块数

剩余粒间孔长石溶孔岩屑溶孔其他
长6段1.970.920.090.183.17725
长7段0.910.980.080.142.11227

图4

姬塬地区长6段、长7段储层孔隙类型柱状图"

图5

姬塬地区长6段、长7段储层孔隙度与渗透率相关关系"

表4

姬塬地区长6段、长7段储层孔喉特征参数统计（恒速压汞）"

样品编号层位深度/m孔隙度/%渗透率/（×10-3μm2)平均喉道半径/μm平均孔隙半径/μm排驱压力/MPa喉道进汞饱和度/%孔隙进汞饱和度/%总进汞饱和度/%
JY6-1长62 23014.60.150.78126.610.5533.1939.8873.07
JY6-2长62 34914.60.320.96127.120.4423.8237.3261.14
JY6-3长62 2899.60.431.49127.790.1737.3749.2486.61
长6段平均2 28912.90.301.08127.170.3931.4642.1573.61
JY7-1长72 58010.20.150.36151.471.4418.8026.3345.13
JY7-2长72 4069.10.120.14148.980.5520.3216.0836.40
JY7-3长72 4168.90.100.31150.061.8925.6430.6356.27
JY7-4长72 5179.60.060.56130.250.8732.0145.7277.73
JY7-5长72 4239.80.130.61131.680.7735.7549.6685.41
长7段平均2 4689.50.110.40142.491.1026.5033.6860.19

图6

姬塬地区长6段、长7段储层孔隙半径分布"

图7

不同成因喉道特征"

图8

姬塬地区长6段、长7储层喉道半径分布"

图9

长6段储层孔喉分布"

图10

长7段储层孔喉分布"

图11

姬塬地区长6段、长7段储层微观孔隙结构"

图12

不同成因喉道与孔隙连通示意"

图13

JY7-3喉道分形特征"

图14

JY7-3样品恒速压汞进汞曲线"

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