Multi-scale migration mechanism,accumulation effect and enrichment mode of tight oil reservoir in the Member 7 of Yanchang Formation in Jiyuan area,Ordos Basin

doi:10.7623/syxb202506007

Acta Petrolei Sinica ›› 2025, Vol. 46 ›› Issue (6): 1126-1143.DOI: 10.7623/syxb202506007

• PETROLEUM EXPLORATION • Previous Articles

Multi-scale migration mechanism,accumulation effect and enrichment mode of tight oil reservoir in the Member 7 of Yanchang Formation in Jiyuan area,Ordos Basin

Wang Fuwei^1,2, Chen Dongxia^1,2, Jiang Mengya^1,2, Wanma Renzeng^1,2, Liu Chen^1,2, Wang Qiaochu^1,2, Wang Yuchao^1,2, Rong Lanxi^1,2, Wang Yuqi^1,2, Cheng Ming³

1. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China;
2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
3. Changbei Operating Company, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China

Received:2024-05-15 Revised:2024-12-09 Published:2025-06-28

鄂尔多斯盆地姬塬地区延长组7段致密储层石油多尺度运移机制、成藏效应及富集模式

王福伟^1,2, 陈冬霞^1,2, 姜梦雅^1,2, 完玛仁增^1,2, 刘晨^1,2, 王翘楚^1,2, 王昱超^1,2, 荣澜熹^1,2, 王玉杞^1,2, 成铭³

1. 油气资源与工程全国重点实验室, 中国石油大学(北京) 北京 102249;
2. 中国石油大学(北京)地球科学学院北京 102249;
3. 中国石油长庆油田公司长北作业分公司陕西西安 710018

通讯作者: 陈冬霞,女,1974年11月生,2003年获中国石油大学(北京)博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事油气藏形成机理与分布规律方面的教学和科研工作,Email:lindachen@cup.edu.cn
作者简介:王福伟,男,1996年1月生,2023年获中国石油大学(北京)博士学位,现为中国石油大学(北京)博士后,主要从事油气藏形成机理与分布规律研究。Email:wangfw_cup@163.com
基金资助:
国家自然科学基金项目(No.42402152)、中国石油大学(北京)科研基金项目(2462023XKBH011)和中国石油天然气集团有限公司—中国石油大学(北京)战略合作科技专项(ZLZX2020-02-01-03)资助。

Abstract

Abstract: This study aims to solve the problem of unclear multi-scale migration mechanism and hydrocarbon accumulation effect of tight oil reservoir in the Member 7 of Yanchang Formation in Ordos Basin. Taking the Jiyuan area as an example, a systematical analysis is carried out on the migration scales division, crude oil occurrence, petroliferous properties, mobility and productivity evaluation, thereby revealing the oil enrichment mechanism and hydrocarbon differential accumulation under multi-scale migration. The results show as follows. (1)Oil migration of tight sandstone reservoir in the Member 7 of Yanchang Formation can be divided into three types:vertical migration at the centimeter to meter scale (small-scale), vertical migration at the ten meter to one hundred-meter scale (medium-scale), and lateral migration at the kilometer scale (large-scale). (2)The occurrence of small-scale vertical migration depends on the dynamic-to-resistance difference at the source-reservoir interface, and the oil enrichment degree is controlled by the source-reservoir assemblage and reservoir quality. Correspondingly, tight oil is characterized by low saturated hydrocarbon content, small ratio of light to heavy component, and the large aperture difference of light and heavy components. In addition, the oil content and fluid mobility of tight reservoirs are enhanced with the increase of sand thickness, and the tight reservoir with the source sandwiched between reservoirs has the best productivity. (3)Driven by the source-reservoir excess pressure difference, the medium-scale vertical migration and large-scale lateral migration of oil are along the high-angle structural fractures and the laterally connected sand bodies, respectively. The oil enrichment is controlled by reservoir quality and migration distance. (4)With the increase of migration distance, the saturated hydrocarbon content and the ratio of light to heavy component of crude oil gradually increase, the occurrence aperture distribution of light and heavy components gradually coincides, and the oil content gradually decreases while the proportion of mobile oil gradually increases. Ultimately, these factors lead to better productivity in the second submember of Member 7 of Yanchang Formation by medium-scale vertical migration and the interval from 1 km to 10 km by large-scale lateral migration. The multi-scale migration and hydrocarbon accumulation effect can reasonably explain the differential occurrence, distribution and enrichment characteristics of tight oil reservoir in the Member 7 of Yanchang Formation, which provides a reference for improving the evaluation of tight reservoir sweet spots and guiding hydrocarbon exploration and development.

Key words: multi-scale migration, accumulation effect, tight reservoir, Member 7 of Yanchang Formation, Jiyuan area, Ordos Basin

摘要： 针对鄂尔多斯盆地延长组7段(长7段)致密储层内石油的多尺度运移机制不清以及成藏效应不明的问题,以姬塬地区为例,系统开展了运移尺度类型划分、原油赋存、含油性、可动性以及产能评价对比,揭示了不同运移尺度下的原油充注运聚机制及成藏差异性。研究结果表明:①长7段致密砂岩储层内的石油运移可划分为厘米—米级小尺度垂向运移、十米—百米级中尺度垂向运移、千米级大尺度侧向运移3种类型;②小尺度垂向运移的发生取决于源-储界面上的垂向动力-阻力差异,原油的富集程度受源-储组合及储层质量控制,具有饱和烃含量低、轻重比较小、轻重组分赋存的孔径范围差异大的特征,储层含油性及可动性均随砂体厚度的增大而增强,以储夹源型储层的产能较好;③中尺度垂向运移和大尺度侧向运移的油气在源-储过剩压力差驱动下分别沿高角度构造裂缝和侧向连通砂体进行,原油的富集均受储层质量与运移距离制约;④随着运移距离的增加,原油饱和烃含量与轻重比逐渐增大,轻重组分赋存的孔径范围逐渐重合,储层含油性逐渐降低而可动油占比逐渐增高,最终在中尺度垂向运移的长7段2亚段内部和大尺度侧向运移的1~10 km区间表现出更好的产能。多尺度运移现象及成藏效应能合理地解释长7段致密储层中原油的差异赋存、分布及富集特征,对于完善致密储层甜点的评价并进一步指导勘探开发具有参考价值。

关键词: 多尺度运移, 成藏效应, 致密储层, 延长组7段, 姬塬地区, 鄂尔多斯盆地

CLC Number:

TE122.3

Wang Fuwei, Chen Dongxia, Jiang Mengya, Wanma Renzeng, Liu Chen, Wang Qiaochu, Wang Yuchao, Rong Lanxi, Wang Yuqi, Cheng Ming. Multi-scale migration mechanism,accumulation effect and enrichment mode of tight oil reservoir in the Member 7 of Yanchang Formation in Jiyuan area,Ordos Basin[J]. Acta Petrolei Sinica, 2025, 46(6): 1126-1143.

王福伟, 陈冬霞, 姜梦雅, 完玛仁增, 刘晨, 王翘楚, 王昱超, 荣澜熹, 王玉杞, 成铭. 鄂尔多斯盆地姬塬地区延长组7段致密储层石油多尺度运移机制、成藏效应及富集模式[J]. 石油学报, 2025, 46(6): 1126-1143.

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Multi-scale migration mechanism,accumulation effect and enrichment mode of tight oil reservoir in the Member 7 of Yanchang Formation in Jiyuan area,Ordos Basin

鄂尔多斯盆地姬塬地区延长组7段致密储层石油多尺度运移机制、成藏效应及富集模式

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