鄂尔多斯盆地麻黄山—堡子湾地区三叠系长1+2低渗透砂岩储层成藏条件及主控因素

张靓; 齐媛; 孙玉玺; 贺燚平

doi:10.3969/j.issn.1006-6535.2025.04.008

特种油气藏 >

2025 , Vol. 32 >Issue 4: 68 - 76

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.04.008

地质勘探

鄂尔多斯盆地麻黄山—堡子湾地区三叠系长1+2低渗透砂岩储层成藏条件及主控因素

张靓 ,
齐媛 ,
孙玉玺 ,
贺燚平

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1.中国石化石油工程技术研究院有限公司,北京 102206;
2.页岩油气富集机理与有效开发国家重点实验室,北京 102206;
3.中国石油大学(北京),北京 102249;
4.中国石油长庆油田分公司,陕西西安 710021

张靓(1990—),女,2012年毕业于中国石油大学(北京)地质工程专业,2019年毕业于该校地质学专业,获博士学位,现从事油气地质与提高采收率研究工作。

收稿日期: 2024-08-08

修回日期: 2025-05-16

网络出版日期: 2025-09-03

基金资助

中国石油创新基金“吉木萨尔凹陷芦草沟组碳酸盐岩滩坝型储层成因与分布”(2021D002-0102)

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Accumulation conditions and main controlling factors of Triassic Chang 1+2 low-permeability sandstone reservoirs in the Mahuangshan-Buziwan Area, Ordos Basin

ZHANG Liang ,
QI Yuan ,
SUN Yuxi ,
HE Yiping

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1. Sinopec Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206, China;
2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China;
3. China University of Petroleum (Beijing), Beijing 102249, China;
4. PetroChina Changqing Oilfield Company, Xi′an, Shaanxi 710021, China

Received date: 2024-08-08

Revised date: 2025-05-16

Online published: 2025-09-03

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摘要

鄂尔多斯盆地中西部麻黄山—堡子湾地区三叠系长1+2油藏普遍发育低渗透砂岩储层,油气勘探潜力巨大,但成藏条件及主控因素尚未明确。为此,基于岩心、铸体薄片及测井等资料,开展成藏条件、油藏富集主控因素分析。结果表明:研究区长1+2油藏油源来自于长7段深湖相泥页岩,油气通过断层、多期叠置砂体运移;不整合面、低幅鼻隆构造、优势相带和物性是控制长1+2油藏富集的关键因素;在不整合面和低幅鼻隆构造封挡作用下,油藏不断向东南方向迁移,在优势相带及物性好的区域油气最为富集,具有“不整合面遮挡、砂体断层疏导、鼻隆控藏、物性控富”的成藏特征。研究成果为该地区低渗透油藏预测提供了理论依据。

关键词： 鄂尔多斯盆地; 延长组; 不整合面; 成藏因素; 油藏分布

本文引用格式

张靓 , 齐媛 , 孙玉玺 , 贺燚平 . 鄂尔多斯盆地麻黄山—堡子湾地区三叠系长1+2低渗透砂岩储层成藏条件及主控因素[J]. 特种油气藏, 2025 , 32(4) : 68 -76 . DOI: 10.3969/j.issn.1006-6535.2025.04.008

Abstract

Low-permeability sandstone reservoirs in the Triassic Chang 1+2 oil reservoirs are widely developed in the Mahuangshan-Buziwan area in the central and western Ordos Basin, with great potential for hydrocarbon exploration. However, the hydrocarbon accumulation conditions and main controlling factors remain unclear. To address this, an analysis of hydrocarbon accumulation conditions and the main controlling factors of oil reservoir enrichment was conducted based on core samples, cast thin sections, and logging data. The results show that The oil source for the Chang 1+2 reservoirs in the study area is the Chang 7 deep-lacustrine mud-shale. Hydrocarbons migrate through faults and multi-phase superimposed sand bodies. Unconformities, low-amplitude nose structures, dominant facies belts, and lithological properties are the key factors controlling the enrichment of the Chang 1+2 reservoirs. Under the blocking effect of unconformities and low-amplitude nose structures, the reservoirs continue to migrate towards the southeast, with the richest hydrocarbons in areas with dominant facies belt and lithological properties. The reservoirs have the characteristics of "unconformity blocking, sandbody-fault guidance, nose-controlled reservoirs, and lithological control of enrichment". The research provides a theoretical basis for predicting low-permeability reservoirs in the area.

Key words： Ordos Basin; Yanchang Formation; unconformity; accumulation factors; reservoir distribution

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