柴达木盆地大风山构造带新近系下油砂山组湖相混积岩特征及其成岩作用分析

何辉; 谢琳; 李显明; 何建红; 李仕远; 侯鸣秋; 马朋善

doi:10.3969/j.issn.1006-6535.2026.01.002

特种油气藏 >

2026 , Vol. 33 >Issue 1: 11 - 21

DOI: https://doi.org/10.3969/j.issn.1006-6535.2026.01.002

地质勘探

柴达木盆地大风山构造带新近系下油砂山组湖相混积岩特征及其成岩作用分析

何辉 ,
谢琳 ,
李显明 ,
何建红 ,
李仕远 ,
侯鸣秋 ,
马朋善

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1.中国石油勘探开发研究院,北京 100083;
2.中国石油青海油田分公司,甘肃敦煌 736202

何辉(1982—),男,高级工程师,2004年毕业于西南石油学院资源勘察工程专业,2010年毕业于中国地质大学(北京)能源地质工程专业,获博士学位,现主要从事油藏描述工作。

收稿日期: 2024-12-09

修回日期: 2025-11-09

网络出版日期: 2026-06-22

基金资助

中国石油科技重大专项“深层/超深层油气藏开发技术研究”(2021DJ1001)

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Characteristics and diagenesis of lacustrine mixed sedimentary rocks of the Neogene Lower Youshashan Formation in Dafengshan structural belt, Qaidam Basin

HE Hui ,
XIE Lin ,
LI Xianming ,
HE Jianhong ,
LI Shiyuan ,
HOU Mingqiu ,
MA Pengshan

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1. CNPC Exploration and Development Research Institute, Beijing 100083, China;
2. PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202, China

Received date: 2024-12-09

Revised date: 2025-11-09

Online published: 2026-06-22

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摘要

针对柴达木盆地西北部大风山构造带风西地区新近系下油砂山组致密混积岩岩性分类、成岩作用类型及成因机制不清的问题,综合岩心观察、薄片鉴定、X衍射分析等技术手段,提出新的细粒混积岩分类方案,明确了风西地区下油砂山组混积岩岩石类型,进一步指导混积岩岩相划分、发育主控因素分析。研究结果表明:藻云岩和泥晶云岩为研究区最有利的岩石类型,其次为藻灰岩及泥晶灰岩;成岩作用类型包括白云石化作用、溶蚀作用、自生矿物充填作用和破裂作用;基于成岩作用分析,将下油砂山组储层细分为5种成岩相;大风山地区湖相混积岩储层成因受多种因素控制,随埋深加大,各种成岩作用使储层进一步致密化,但建设性成岩作用仍提供了优质储层形成的条件。该研究为柴西北大风山构造带混积岩识别及其优势“甜点”成岩相研究提供了有力的指导。

关键词： 混积岩; 成岩作用; 大风山构造带; 风西地区; 下油砂山组; 柴达木盆地

本文引用格式

何辉 , 谢琳 , 李显明 , 何建红 , 李仕远 , 侯鸣秋 , 马朋善 . 柴达木盆地大风山构造带新近系下油砂山组湖相混积岩特征及其成岩作用分析[J]. 特种油气藏, 2026 , 33(1) : 11 -21 . DOI: 10.3969/j.issn.1006-6535.2026.01.002

Abstract

To clarify the lithological classification,diagenetic types,and genetic mechanism of the tight mixed sedimentary rocks of the Neogene Lower Youshashan Formation in Fengxi Area of the Dafengshan structural belt,northwestern Qaidam Basin,an integrated analysis was made using core observation,thin-section identification,X-ray diffraction,and other techniques.A new classification scheme for fine-grained mixed sedimentary rocks was proposed,which specified the rock types of the Lower Youshashan Formation mixed rocks in Fengxi Area and further guided the division of mixed-rock facies and analysis of the main development controlling factors.The results show that algal dolomite and micritic dolomite are the most favorable rock types in the study area,followed by algal limestone and micritic limestone.Diagenetic processes include dolomitization,dissolution,authigenic mineral filling,and fracturing.Based on the diagenetic analysis,the Lower Youshashan Formation reservoir is subdivided into five diagenetic facies.The genesis of the lacustrine mixed sedimentary rock reservoir in the Dafengshan area is controlled by multiple factors;with increasing burial depth,various diagenetic processes lead to further reservoir densification,but constructive diagenesis still enables the formation of high-quality reservoirs.This study provides valuable guidance for the identification of mixed sedimentary rocks and for research on favorable“sweet-spot”diagenetic facies in the Dafengshan structural belt of northwestern Qaidam Basin.

Key words： mixed sedimentary rocks; diagenesis; Dafengshan structural belt; Fengxi Area; Lower Youshashan Formation; Qaidam Basin

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