鄂尔多斯盆地西南部二叠系盒8下段储层特征及控制因素

doi:10.12108/yxyqc.20210203

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (2): 17–25.doi: 10.12108/yxyqc.20210203

鄂尔多斯盆地西南部二叠系盒8下段储层特征及控制因素

魏钦廉^1,2, 崔改霞^1,2, 刘美荣³, 吕玉娟³, 郭文杰³

1. 西安石油大学地球科学与工程学院, 西安 710065;
2. 陕西省油气成藏地质学重点实验室, 西安 710065;
3. 中国石油长庆油田分公司第二采油厂, 甘肃庆阳 745100

收稿日期:2020-09-27 修回日期:2020-11-25 出版日期:2021-04-01 发布日期:2021-03-31
通讯作者: 崔改霞(1995—),女,西安石油大学在读硕士研究生,研究方向为储层地质学。Email:649582327@qq.com。 E-mail:649582327@qq.com
作者简介:魏钦廉(1976—),男,博士,副教授,主要从事石油地质方面的教学和研究工作。地址:(710065)陕西省西安市雁塔区电子二路东段18号。Email:wql@xsyu.edu.cn
基金资助:
国家科技重大专项“CO₂捕集、驱油与埋存技术示范工程”（编号：2016ZX05056）资助

Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin

WEI Qinlian^1,2, CUI Gaixia^1,2, LIU Meirong³, LYU Yujuan³, GUO Wenjie³

1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
3. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China

Received:2020-09-27 Revised:2020-11-25 Online:2021-04-01 Published:2021-03-31

摘要/Abstract

摘要： 鄂尔多斯盆地西南部二叠系盒8下段为天然气主力产层，为了明确该区储层特征及控制因素，通过铸体薄片、扫描电镜、高压压汞及储层物性等手段，对二叠系盒8下段储层特征及主控因素进行了研究。结果显示：①鄂尔多斯盆地西南部二叠系盒8下段孔隙类型以岩屑溶孔和粒间孔为主，晶间微孔次之，喉道半径普遍较小。②岩石组分对研究区二叠系盒8下段储层孔隙结构类型具有重要影响，石英含量高有利于原生孔隙的发育和保存，具有较好的孔隙结构。③成岩作用是导致研究区盒8下段储层孔隙结构差异的关键因素，压实作用和胶结作用对储层孔隙结构具有一定的破坏作用，是导致研究区储层致密的重要因素，溶蚀作用对物性具有一定正面作用，但其改善效果有限。该研究成果对鄂尔多斯盆地西南部二叠系致密储层的精细勘探具有借鉴作用。

关键词: 致密砂岩, 孔隙结构, 盒8下段, 二叠系, 鄂尔多斯盆地

Abstract: The Permian lower He 8 member in southwestern Ordos Basin is the main gas producing layer. In order to clarify the reservoir characteristics and controlling factors in this area,the reservoir characteristics and controlling factors of the Permian lower He 8 member were studied by means of casting thin section,scanning electron microscope,high-pressure mercury injection and reservoir physical properties. The results show that:(1) The pore types of the Permian lower He 8 member in southwestern Ordos Basin are dominated by lithic dissolved pores and intergranular pores,followed by intercrystalline micropores,and the throat radius is generally small. (2) The rock composition has an important influence on the reservoir pore structure type of the Permian lower He 8 member in the study area. The high content of quartz is conducive to the development and preservation of primary pores and has a better pore structure.(3) Diagenesis is the key factor leading to the difference in reservoir pore structure of the lower He 8 member in the study area. Compaction and cementation have a certain destructive effect on the pore structure,and they are important factors that lead to tight reservoirs in the study area. Dissolution has a positive effect on physical properties,but its improvement effect is limited. The research results can be used as a reference for fine exploration of Permian tight reservoirs in southwestern Ordos Basin.

Key words: tight sandstone, pore structure, lower He 8 member, Permian, Ordos Basin

中图分类号:

TE122.2

魏钦廉, 崔改霞, 刘美荣, 吕玉娟, 郭文杰. 鄂尔多斯盆地西南部二叠系盒8下段储层特征及控制因素[J]. 岩性油气藏, 2021, 33(2): 17–25.

WEI Qinlian, CUI Gaixia, LIU Meirong, LYU Yujuan, GUO Wenjie. Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin[J]. Lithologic Reservoirs, 2021, 33(2): 17–25.

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鄂尔多斯盆地西南部二叠系盒8下段储层特征及控制因素

Reservoir characteristics and controlling factors of Permian lower He 8 member in southwestern Ordos Basin

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