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

doi:10.3969/j.issn.1006-6535.2026.01.002

摘要/Abstract

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

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

中图分类号:

TE122.3

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.

HE Hui, XIE Lin, LI Xianming, HE Jianhong, LI Shiyuan, HOU Mingqiu, MA Pengshan. Characteristics and diagenesis of lacustrine mixed sedimentary rocks of the Neogene Lower Youshashan Formation in Dafengshan structural belt, Qaidam Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(1): 11-21.

参考文献

[1] BRUCKNER W D.Cyclic calcareous sedimentation as an index of climatic variations in the past[J].Journal of Sedimentary Petrology,1953,23(4):235-237.
[2] BUTTON A,VOS R G.Subtidal and intertidal clastic and carbonate sedimentation in a macrotidal environment:an example from the Lower Proterozoic of south Africa[J].Sedimentary Geology,1977,18(1-3):175-200.
[3] MOUNT J F.Mixing of siliciclastic and carbonate sediments in shallow shelf environments[J].Geology,1984,12(7):432-435.
[4] MOUNT J F.Mixed siliciclastic and carbonate sediments:a proposed first-order textural and compositional classification[J].Sedimentology,1985,32(3):435-442.
[5] BRETT C E,BAIRD G C.Carbonate-shale cycles in the Middle Devonian of New York:an evaluation of models for the origin of limestones in terrigenous shelf sequences[J].Geology,1985,13(5):227-231.
[6] BLAIR T C.Mixed siliciclastic-carbonate marine and continental syn-rift sedimentation,Upper Jurassic-lowermost Cretaceous Todos Santos and San Ricardo formations,western Chiapas,Mexico[J].Journal of Sedimentary Research,1988,58(4):623-636.
[7] DAVIS H R,BYERS C W.Shelf sandstones in the Mowry Shale:evidence for deposition during Cretaceous sea level falls[J].Journal of Sedimentary Petrology,1989,59(4):548-560.
[8] MARTIN C J.Sequence stratigraphy of mixed carbonate-siliciclastic platforms developed in a tectonically active setting,Upper Cretaceous,Betic continental margin (Spain)[J].Journal of Sedimentary Research,1995,65(B2):235-254.
[9] GARCIA H J F,GIL J,SEGURA M,et al.Internal anatomy of a mixed siliciclastic-carbonate platform:the Late Cenomanian-Mid Turonian at the southern margin of the Spanish central system[J].Sedimentology,2007,54(6):1245-1271.
[10] 杨朝青,沙庆安.云南曲靖中泥盆统曲靖组的沉积环境:一种陆源碎屑与海相碳酸盐的混合沉积[J].沉积学报,1990,8(2):59-66.
YANG Chaoqing,SHA Qing'an.Sedimentary environment of the Middle Devonian Qujing Formation,Qujing,Yunnan Province:a kind of mixed sedimentation of terrigenous clastics and carbonate[J].Acta Sedimentologica Sinica,1990,8(2):59-66.
[11] 江茂生,沙庆安.碳酸盐与陆源碎屑混合沉积体系研究进展[J].地球科学进展,1995,10(6):551-554.
JIANG Maosheng,SHA Qing'an.Research advances in the mixed siliciclastic-carbonate sedimentary systems[J].Advance in Earth Sciences,1995,10(6):551-554.
[12] 李祥辉,刘文均,郑荣才.龙门山地区泥盆纪碳酸盐与硅质碎屑的混积相与混积机理[J].岩相古地理,1997,17(3):1-10.
LI Xianghui,LIU Wenjun,ZHENG Rongcai.Hybrid facies and mechanism for the formation of the mixed Devonian carbonate-siliciclastic sediments in the Longmen Mountain Area Sichuan[J].Sedimentary Facies and Palaeogeography,1997,17(3):1-10.
[13] 沙庆安.混合沉积和混积岩的讨论[J].古地理学报,2001,3(3):63-66.
SHA Qing'an.Discussion on mixing deposit and hunji rock[J].Journal of Palaeogeography(Chinese Edition),2001,3(3):63-66.
[14] 张雄华.混积岩的分类和成因[J].地质科技情报,2000,19(4):31-34.
ZHANG Xionghua.Classification and origin of mixosedimentite[J].Bulletin of Geological Science and Technology,2000,19(4):31-34.
[15] 郭福生,严兆彬,杜杨松.混合沉积、混积岩和混积层系的讨论[J].地学前缘,2003,10(3):68.
GUO Fusheng,YAN Zhaobin,DU Yangsong.Discussion on mixed deposition,mixosedimentite and mixed siliciclastic-carbonate succession[J].Earth Science Frontiers,2003,10(3):68.
[16] 孟兆鸿,冯斌,王冠民.孤北洼陷陡坡带的混合生屑浅滩沉积[J].石油地质与工程,2009,23(6):9-11.
MENG Zhaohong,FENG Bin,WANG Guanmin.Sedimentation of mixed bioclastic shallows of steep slope zone in Gubei Depression[J].Petroleum Geology and Engineering,2009,23(6):9-11.
[17] 徐伟,陈开远,曹正林,等.咸化湖盆混积岩成因机理研究[J].岩石学报,2014,30(6):1804-1816.
XU Wei,CHEN Kaiyuan,CAO Zhenglin,et al.Original mechanism of mixed sediments in the saline lacustrine basin[J].Acta Petrologica Sinica,2014,30(6):1804-1816.
[18] 徐伟,杜晓峰,黄晓波,等.混合沉积研究进展与关键问题[J].沉积学报,2019,37(2):225-238.
XU Wei,DU Xiaofeng,HUANG Xiaobo,et al.Research advances and critical issues of “mixed siliciclastic and carbonate sediments”[J].Acta Sedimentologica Sinica,2019,37(2):225-238.
[19] 冯进来,曹剑,胡凯,等.柴达木盆地中深层混积岩储层形成机制[J].岩石学报,2011,27(8):2461-2472.
FENG Jinlai,CAO Jian,HU Kai,et al.For ming mechanism of middle-deep mixed rock reservoir in Qaidam Basin[J].Acta Petrologica Sinica,2011,27(8):2461-2472.
[20] 李泉泉,鲍志东,肖毓祥,等.混合沉积研究进展与展望[J].沉积学报,2021,39(1):153-167.
LI Quanquan,BAO Zhidong,XIAO Yuxiang,et al.Research advances and prospect of mixed deposition[J].Acta Sedimentologica Sinica,2021,39(1):153-167.
[21] 彭军,杨一茗,刘惠民,等.陆相湖盆细粒混积岩的沉积特征与成因机理——以东营凹陷南坡陈官庄地区沙河街组四段上亚段为例[J].石油学报,2022,43(10):1409-1426.
PENG Jun,YANG Yiming,LIU Huimin,et al.Sedimentary characteristics and genetic mechanism of fine-grained hybrid sedimentary rocks in continental lacustrine basin:a case study of the upper submember of Member 4 of Shahejie Formation in Chenguanzhuang Area,southern slope of Dongying Sag[J].Acta Petrolei Sinica,2022,43(10):1409-1426.
[22] 张宁生,任晓娟,魏金星,等.柴达木盆地南翼山混积岩储层岩石类型及其与油气分布的关系[J].石油学报,2006,27(1):42-46.
ZHANG Ningsheng,REN Xiaojuan,WEI Jinxing,et al.Rock types of mixosedimentite reservoirs and oil-gas distribution in Nanyishan of Qaidam Basin[J].Acta Petrolei Sinica,2006,27(1):42-46.
[23] 叶茂松,解习农,徐长贵,等.混积岩分类命名体系探讨及对混积岩储层评价的启示——以渤海海域混积岩研究为例[J].地质论评,2018,64(5):1118-1131.
YE Maosong,XIE Xinong,XU Changgui,et al.Discussion for classification-designation system of mixed siliciclastic-carbonate sediments and the implication for their reservoir prediction:a case study of mixed sediments from Bohai Sea Area[J].Geological Review,2018,64(5):1118-1131.
[24] 王建功,张道伟,白亚东,等.柴西地区上油砂山组咸化湖沼沉积与微生物岩[J].地质学报,2020,94(11):3228-3248.
WANG Jiangong,ZHANG Daowei,BAI Yadong,et al.Saline lacustrine palustrine sediments and microbialite in the Upper Youshashan Formation in the western Qaidam Basin[J].Acta Geologica Sinica,2020,94(11):3228-3248.
[25] 杜学斌,刘晓峰,陆永潮,等.陆相细粒混合沉积分类、特征及发育模式——以东营凹陷为例[J].石油学报,2020,41(11):1324-1333.
DU Xuebin,LIU Xiaofeng,LU Yongchao,et al.Classification,characteristics and development models of continental fine-grained mixed sedimentation:a case study of Dongying Sag[J].Acta Petrolei Sinica,2020,41(11):1324-1333.
[26] 彭军,曾垚,杨一茗,等.细粒沉积岩岩石分类及命名方案探讨[J].石油勘探与开发,2022,49(1):106-115.
PENG Jun,ZENG Yao,YANG Yiming,et al.Discussion on classification and na ming scheme of fine-grained sedimentary rocks[J].Petroleum Exploration and Development,2022,49(1):106-115.
[27] 解习农,叶茂松,徐长贵,等.渤海湾盆地渤中凹陷混积岩优质储层特征及成因机理[J].地球科学,2018,43(10):3526-3539.
XIE Xinong,YE Maosong,XU Changgui,et al.High quality reservoirs characteristics and for ming mechanisms of mixed siliciclastic-carbonate sediments in the Bozhong Sag,Bohai Bay Basin[J].Earth Science,2018,43(10):3526-3539.