Oil-bearing Characteristics and "Sweet Spots" Evaluation of Medium-low Maturity Shale Oil Reservoirs in Ludong Sag

doi:10.3969/j.issn.1006-6535.2024.04.004

Abstract

Abstract: To address the issues of unclear distribution characteristics and enrichment control factors of medium-low maturity shale oil reservoirs in the Jiaolige Sag,Ludong Depression,a study on the oil-bearing characteristics of shale oil reservoirs was conducted through methods such as 2D NMR analysis,nano-CT scanning,and identification of kerogen microscopic components.A comprehensive evaluation standard for identifying shale oil sweet spots was established based on factors such as shale lithofacies,reservoircapabilities,oil-bearing characteristics,andmobility.The results show that the degree of development,density,lithology,and other structural characteristics of shale lamination and bedding are the primary influencing factors on the oil-bearing characteristics and distribution.The layered siltstone,composed of coarse grained clastics and laminated felsic shale,exhibits excellent pore microstructure and connectivity.The specific surface area is less than 15 m²/g,and the average pore size of nitrogen adsorption is greater than 8 nm,which is a highly favorable reservoir.The total organic carbon (TOC)content of class Ⅰ+Ⅱ "sweet spot" exceeds 1%,with the reservoir exhibiting medium and large pores accounting for over 25%.The pore size within the reservoir space is greater than 8 nm,indicating a medium to good oil bearing potential and mobility,leading to relatively enriched oil and gas.These findings offer valuable technical support for identifying favorable targets for shale oil development in the study area,as well as for deploying and evaluating test areas.

Key words: "sweet spot" evaluation, occurrence characteristics, microscopic distribution, medium-low maturity, shale oil, Jiaolige Sag, Ludong Sag

CLC Number:

TE122

Zhou Liguo. Oil-bearing Characteristics and "Sweet Spots" Evaluation of Medium-low Maturity Shale Oil Reservoirs in Ludong Sag[J]. Special Oil & Gas Reservoirs, 2024, 31(4): 27-35.

References

[1] 金之钧,王冠平,刘光祥,等.中国陆相页岩油研究进展与关键科学问题[J].石油学报,2021,42(7):821-835.
JIN Zhijun,WANG Guanping,LIU Guangxiang,et al.Research progress and key scientific issues of continental shale oil in China [J].Acta Petrolei Sinica,2021,42 (7):821-835.
[2] 董大忠,邹才能,李建忠,等.页岩气资源潜力与勘探开发前景[J].地质通报,2011,30(2):324-336.
DONG Dazhong,ZOU Caineng,LI Jianzhong,et al.Resourcepotential,exploration and development prospect of shale gas in the whole world [J].Geological Bulletin of China,2011,30(2):324-336.
[3] 杜金虎,胡素云,庞正炼,等.中国陆相页岩油类型、潜力及前景[J].中国石油勘探,2019,24(5):564-566.
DU Jinhu,HU Suyun,PANG Zhenglian,et al.The types,potentials and prospects of continental shale oil in China [J].China Petroleum Exploration,2019,24 (5):564-566.
[4] 胡素云,赵文智,侯连华,等.中国陆相页岩油发展潜力与技术对策[J].石油勘探与开发,2020,47(4):820-826.
HU Suyun,ZHAO Wenzhi,HOU Lianhua,et al.Development potential and technical strategy of continental shale oil in China[J].Petroleum exploration and development, 2020,47(4):820-826.
[5] 焦方正,邹才能,杨智,等.陆相源内石油聚集地质理论认识及勘探开发实践[J].石油勘探与开发,2020,47(4):1070-1075.
JIAO Fangzheng,ZOU Caineng,YANG Zhi,et al.Geological theory and exploration & development practice of hydrocarbon accumulation inside continental source kitchens[J].Petroleum exploration and development,2020,47(4):1070-1075.
[6] 金之钧,白振瑞,高波,等.中国迎来页岩油气革命了吗?[J].石油与天然气地质,2019,40(3):451-458.
JIN Zhijun,BAI Zhenrui,GAO Bo,et al.Has China ushered in a shale oil and gas revolution?[J].Oil & Gas Geology,2019,40(3):451-458.
[7] 孙龙德.古龙页岩油(代序)[J].大庆石油地质与开发,2020,39(3):1-7.
SUN Longde.Gulong shale oil (preface)[J].Petroleum Geology&Oilfield Development in Daqing, 2020,39(3):1-7.
[8] 郭睿波.开鲁盆地陆东凹陷九佛堂组上段页岩含油性评价与可动性预测[D].北京:中国地质大学,2020.
GUO Ruibo.Oil-bearing evaluation and mobility prediction of shale in the upper member of Jiufotang Formation in Ludong Sag,Kailu Basin[D].Beijing:China University of Geosciences,2020.
[9] 刘惠民.济阳坳陷页岩油勘探实践与前景展望[J].中国石油勘探,2022,27(1):73-87.
LIU Huimin.Exploration practice and prospect of shale oil in Jiyang Depression[J].China Petroleum Exploration,2022,27(1):73-87.
[10] 何文渊,蒙启安,张金友,等.松辽盆地古龙页岩油富集主控因素及分类评价[J].大庆石油地质与开发,2021,40(5):1-10.
HE Wenyuan,MENG Qi'an,ZHANG Jinyou,et al.Controlling factors and their classification-evaluation of Gulong shale oil enrichment in Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(5):1-10.
[11] 赵贤正,周立宏,蒲秀刚,等.断陷湖盆湖相页岩油形成有利条件及富集特征——以渤海湾盆地沧东凹陷孔店组二段为例[J].石油学报,2019,40(9):1013-1029.
ZHAO Xianzheng,ZHOU Lihong,PU Xiugang,et al.Favorable formation conditions and enrichment characteristics of lacustrine facies shale oil in faulted lake basin:a case study of Member 2 of Kongdian Formation in Cangdong Sag,Bohai Bay Basin[J].Acta Petrolei Sinica,2019,40(9):1013-1029.
[12] LEI Yuhong,LUO Xiaorong,WANG Xiangzeng,et al.Characteristics of siltylaminae in Zhangjiatan shale of southeastern Ordos Basin,China:implications for shale gas formation[J].AAPG Bulletin,2015,99(4):661-687.
[13] 李阳,赵清民,吕琦,等.中国陆相页岩油开发评价技术与实践[J].石油勘探与开发,2022,49(5):955-963.
LI Yang,ZHAO Qingmin,LYU Qi,et al.Evaluation technology and practice of continental shale oil development in China[J].Petroleum exploration and development,2022,49(5):955-963.
[14] 武晓玲,高波,叶欣,等.中国东部断陷盆地页岩油成藏条件与勘探潜力[J].石油与天然气地质,2013,34(4):455-462.
WU Xiaoling,GAO Bo,YE Xin,et al.Shale oil accumulation conditions and exploration potential of faulted basins in the east of China [J].Oil & Gas Geology,2013,34 (4):455-462.
[15] ALIIX P,BUMHAM A,FOWLER T,et al.Coaxing oil from shale[J].Oilfield Review,2010,22(4):4-15.
[16] HAMMES U,HAMLIN H S,EWING T E.Geologic analysis of the Upper Jurassic Haynesville Shale in east Texas and west Louisiana[J].AAPG Bulletin,2011,95(10):1643-1666.
[17] 苏思远,姜振学,宁传祥,等.沾化凹陷页岩油富集可采主控因素研究[J].石油科学通报,2017,2(2):187-198.
SU Siyuan,JIANG Zhenxue,NING Chuanxiang,et al.Study of the main controlling factors of shale oil enrichment in the Zhanhua Sag[J].Petroleum Science Bulletin,2017,2(2):187-198.
[18] 李志明,钱门辉,黎茂稳,等.中—低成熟湖相富有机质泥页岩含油性及赋存形式——以渤海湾盆地渤南洼陷罗63井和义21井沙河街组一段为例[J].石油与天然气地质,2017,38(3):448-455.
LI Zhiming,QIAN Menhui,LI Maowen,et al.Oil content and occurrence in low-medium mature organic-rich lacustrine shales:a case from the 1st Member of the Eocene-Oligocene Shahejie Formation in Well Luo 63 and Yi 21,Bonan Subsag,Bohai Bay Basin [J].Oil & Gas Geology,2017, 38(3):448-455.
[19] HAN Y,HORSFIELD B,CURRY D J.Control of facies,maturation and primary migration on biomarkers in the Barnett shale sequence in the Marathon 1 Mesquite well,Texas[J].Marine and Petroleum Geology,2017,85:106-116.
[20] 朱晓萌,朱文兵,曹剑,等.页岩油可动性表征方法研究进展[J].新疆石油地质,2019,40(6):745-750.
ZHU Xiaomeng,ZHU Wenbing,CAO Jian,et al.Research progress on shale oil mobility characterization[J].Xinjiang Petroleum Geology,2019,40(6):745-750.
[21] 慕尚超,郭小波,李钰,等.三塘湖盆地马朗凹陷芦草沟组泥页岩储层孔隙结构及含油性[J].西安石油大学学报(自然科学版),2021,36(5):1-11.
MU Shangchao,GUO Xiaobo,LI Yu,et al.Porestructure and oil-bearing properties of mud shale reservoirs of Lucaogou Formation in Malang Sag,Santanghu Basin[J]Journal of Xi'an Shiyou University(Natural Science Edition),2021,36 (5):1-11.
[22] 王然,常秋生,钱永新,等.准噶尔盆地吉木萨尔凹陷芦草沟组页岩油“甜点体”储集特征及成因机理[J].石油实验地质,2020,42(4):604-610.
WANG Ran,CHANG Qiusheng,QIAN Yongxin,et al.Reservoir characteristics and genesis of shale oil "sweet spots" in Lucaogou Formation,Jimsar Sag,Junggar Basin[J].Petroleum Geology & Experiment,2020,42(4):604-610.
[23] 张安达,王继平,王永超,等.松辽盆地古龙页岩储集空间类型及油赋存状态[J].大庆石油地质与开发,2021,40(5):68-75.
ZHANG Anda,WANG Jiping,WANG Yongchao,et al.Reservoir space types and oil occurrence of Gulong shale in Songliao Basin [J].Petroleum Geology & Oilfield Development in Daqing,2021,40 (5):68-75.
[24] 王茂林,程鹏,田辉,等.页岩油储层评价指标体系[J].地球化学,2017,46(2):178-186.
WANG Maolin,CHENG Peng,TIAN Hui,et al.Evaluation index system of shale oil reservoir [J].Geochemistry,2017,46(2):178-186.
[25] 贾梦成.古龙地区青一段泥页岩层系储层特征及富油规律[D].大庆:东北石油大学,2017.
JIA Mengcheng.The reservoir characteristics and oil-enrichment law of Member Qing 1 mud shale in the Gulong Area[D].Daqing:Northeast Petroleum University,2017.
[26] 支东明,唐勇,郑孟林,等.准噶尔盆地玛湖凹陷风城组页岩油藏地质特征与成藏控制因素[J].中国石油勘探,2019,24(5):615-623.
ZHI Dongming,TANG Yong,ZHENG Menglin,et al.Geological characteristics and accumulation controlling factors of shale reservoirs in Fengcheng Formation,Mahu Sag,Junggar Basin[J].China Petroleum Exploration,2019,24(5):615-623.
[27] 崔宝文,陈春瑞,林旭东,等.松辽盆地古龙页岩油甜点特征及分布[J].大庆石油地质与开发,2020,39(3):45-54.
CUI Baowen,CHEN Chunrui,LIN Xudong,et al.Characteristics and distribution of sweet spots in Gulong shale oil reserviors of Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2020,39 (3):45-54.
[28] 陈方文,卢双舫,黄振凯,等.松辽盆地古龙凹陷青一段沉积特征及有利勘探区[J].中南大学学报(自然科学版),2013,44(5):1955-1963.
CHEN Fangwen,LU Shuangfang,HUANG Zhenkai,et al.Sedimentary characteristics and favorable exploration areas of Qingyi Member in Gulong Sag,Songliao Basin[J].Journal of Central South University (Natural Science Edition),2013,44 (5):1955-1963.
[29] 肖飞,杨建国,李士超,等.松辽盆地齐家和古龙凹陷页岩油含油性参数优选与资源量计算[J].地质与资源,2021,30(3):395-403.
XIAO Fei,YANG Jianguo,LI Shichao,et al.Oil-bearing parameter optimization and resource calculation of the shale oil in Qijia and Gulong Sags,Songliao Basin[J].Geology and Resources,2021,30(3):395-403.
[30] GALE J F W,LAUBACH S E,OlSON J E,et al.Natural fractures in shale:a review and new observations[J].AAPG Bulletin,2014,98(11):2165-2216.
[31] 陈波,田崇鲁.储层构造裂缝数值模拟技术的应用实例[J].石油学报,1998,19(4):62-66.
CHEN Bo,TIAN Chonglu.Oil field development abstract numerical simulation technique for structural fractures in a reservoir case studies[J].Acta Petrolei Sinica,1998,19 (4):62-66.