鄂尔多斯盆地旬宜地区古生界致密砂岩储层发育特征及主控因素

doi:10.7657/XJPG20260203

摘要/Abstract

摘要：

鄂尔多斯盆地古生界石盒子组—太原组储层是成岩作用强烈、低孔低渗且非均质性很强的致密砂岩储层，为了厘清储层的发育特征及主控因素，通过岩石薄片、铸体薄片、全岩X射线衍射、扫描电镜、物性实验等，系统研究石盒子组—太原组储层的发育特征以及不同组分、结构在成岩过程中的差异性演化，分析储层的主控因素。旬宜地区石盒子组—太原组发育了高塑性岩屑砂岩储层、富石英低塑性岩屑砂岩储层和石英砂岩+岩屑石英砂岩储层3种类型，石盒子组、山西组和太原组平均孔隙度分别为5.67%、2.79%和5.64%，平均渗透率分别为1.37 mD、0.30 mD和0.27 mD；孔隙类型以粒间溶孔和粒内溶孔为主，其次为原生粒间孔和黏土矿物晶间孔；填隙物主要为自生黏土矿物，其次为自生石英和方解石。研究结果表明，甜点储层物源方向主要为研究区西南方向；中侏罗世至晚白垩世储层溶蚀作用造成次生孔隙大量发育，为石盒子组—太原组甜点储层的主要控制因素；黏土矿物对储层的保护及改善，是石盒子组—太原组甜点储层的次要控制因素，主要表现为石盒子组的自生绿泥石薄膜对储层原生孔隙的保护，在山西组和太原组伊蒙混层中蒙脱石向伊利石转化过程中形成的晶间孔改善了储层孔隙度及渗透率。

关键词: 鄂尔多斯盆地, 旬宜地区, 石盒子组, 山西组, 太原组, 致密砂岩, 储层特征, 主控因素

Abstract:

The reservoirs of the Paleozoic Shihezi-Taiyuan formation in the Xunyi area of the Ordos Basin are tight sandstone reservoirs featured with strong diagenesis, low porosity, low permeability, and strong heterogeneity. In this paper, through analyses of rock thin sections, cast thin sections, whole rock X-ray diffraction (XRD), scanning electron microscopy (SEM), and petrophysical properties, the Shihezi-Taiyuan formation reservoirs were systematically investigated for their development characteristics, differential evolution of components/structures during diagenesis, and controlling factors. The Shihezi-Taiyuan formation reservoirs in the Xunyi area are divided into three types: highly-plastic lithic sandstone, quartz-rich and lowly-plastic lithic sandstone, and quartz sandstone + lithic quartz sandstone. The reservoirs of Shihezi, Shanxi and Taiyuan formations exhibit an average porosity of 5.67%, 2.79% and 5.64%, and an average permeability of 1.37 mD, 0.30 mD and 0.27 mD, respectively. The pore types are mainly intergranular dissolved pores and intragranular dissolved pores, followed by primary intergranular pores and clay mineral intercrystalline pores. The interstitial materials are represented by authigenic clay minerals, as well as authigenic quartz and calcite. The research results indicate that the source for the sweet spot was mainly supplied from the southwest provenance of the study area. The dissolution of reservoirs from the Middle Jurassic to the Late Cretaceous resulted in the extensive development of secondary pores, which is a primary controlling factor of the sweet spot reservoir in Shihezi-Taiyuan formation. The reservoir protection and improvement resulted from clay minerals is a secondary factor, and it is mainly manifested by the protection of the primary pores in the reservoir by the authigenic chlorite film in the Shihezi formation, and the improvement of reservoir porosity and permeability by the intercrystalline pores formed during the transformation from smectite to illite in the mixed layer in the Shanxi formation and Taiyuan formation.

Key words: Ordos Basin, Xunyi area, Shihezi formation, Shanxi formation, Taiyuan formation, tight sandstone, reservoir characteristic, controlling factor

中图分类号:

TE122.2

朱颜. 鄂尔多斯盆地旬宜地区古生界致密砂岩储层发育特征及主控因素[J]. 新疆石油地质, 2026, 47(2): 146-154.

ZHU Yan. Development Characteristics and Controlling Factors of Paleozoic Tight Sandstone Reservoirs in Xunyi Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2026, 47(2): 146-154.

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地层	骨架颗粒含量						填隙物平均含量
地层	石英	长石	火成岩岩屑	变质岩岩屑	沉积岩岩屑	云母	泥质杂基	方解石	白云石	自生黏土矿物	自生石英
石盒子组	43.00~82.00 （62.40）	0~15.00 （6.80）	1.00~10.00 （5.72）	13.00~50.00 （24.64）	0~2.00 （0.40）	0~12.00 （2.40）	1.14	1.64	0	7.54	0.04
山西组	25.00~93.00 （59.30）	0~14.00 （2.30）	0~62.00 （13.65）	5.00~42.00 （20.88）	0~14.00 （2.41）	0~13.00 （1.23）	0.44	1.20	0	4.54	0.21
太原组	50.00~94.00 （73.95）	0~20.00 （1.95）	1.00~26.00 （6.51）	3.00~45.00 （16.43）	0	0~11.00 （1.24）	0	0.38	0.65	3.35	2.05

地层	伊蒙混层含量	伊利石含量	高岭石含量	绿泥石含量	伊蒙混层比
石盒子组	47.50	22.38	6.87	23.25	19.38
山西组	57.60	26.34	8.99	7.07	17.66
太原组	47.06	49.25	2.51	1.18	10.56