Formation Mechanism and Distribution Models of Ordovician Reservoirs in Northern Jizhong Depression

doi:10.3969/j.issn.1006-6535.2020.05.009

Abstract

Abstract: In order to solve the problem of unclear understanding of Ordovician buried hill reservoirs in northern Jizhong depression, on the basis of core observation, the basic characteristics, genetic types and main controlling factors of reservoirs in this area were studied by using drilling, well logging, analysis and laboratory data, etc. The results show that 4 sets of dolomite pore type and 1 set of karst fractured-vuggy type reservoirs are developed in this area. Lithology is mainly micritic-powdered crystal dolomite and calcareous dolomite, followed by micritic limestone. The reservoir space mainly includes intercrystalline (dissolution) pores, structural fractures and dissolution pores, etc. Through the study of the basic characteristics of the reservoirs, it is confirmed that the formation of favorable reservoirs is mainly controlled by factors such as rock type, fracture development degree and karstification intensity; rock type is the basis for controlling reservoir formation; fracture development degree is the key to restrict reservoir formation; karstification intensity controls reservoir advantages and disadvantages. Based on this, three reservoir development models of Ordovician in the northern Jizhong depression are established, namely, regional stratified model, regional massive-stratified composite model and local massive model, which provides basis for the establishment of reservoir-forming models and exploration deployment.

Key words: northern Jizhong depression, Ordovician, carbonate reservoir, formation mechanism, distribution model

CLC Number:

TE122.2

Zhao Wenlong, Han Chunyuan, Yan Mengying, Qiao Bo, Luo Jing, Xue Hui, Guo Huiping. Formation Mechanism and Distribution Models of Ordovician Reservoirs in Northern Jizhong Depression[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 61-67.

References

[1] 杜金虎,邹伟宏,费宝生,等.冀中拗陷古潜山复式油气聚集区[M].北京:科学出版社,2002:42-56.
DU Jinhu,ZOU Weihong,FEI Baosheng,et al.Complicated hydrocarbon accumulation area of buried hill in Jizhong Depression[M].Beijing:Science Press,2002:42-56.
[2] 杜金虎,何海清,赵贤正,等.渤海湾盆地廊固凹陷杨税务超深超高温奥陶系潜山油气勘探重大突破实践与启示[J].中国石油勘探,2017,22(2):1-12.
DU Jinhu,HE Haiqing,ZHAO Xianzheng,et al.Signifcant exploration breakthrough in Yangshuiwu ultra-deep and ultra-high temperature Ordovician buried-hill in Langgu Sag,Bohai Bay Basin[J].China Petroleum Exploration,2017,22(2):1-12.
[3] 苏立萍,罗平,胡社荣.苏桥潜山带奥陶系碳酸盐岩储集层研究[J].石油勘探与开发, 2003,30(6):54-57.
SU Liping,LUO Ping,HU Sherong.Ordovician carbonate reservoirs in the Suqiao buried hills zone of Jizhong Depression[J].Petroleum Exploration and Development,2003,30(6):54-57.
[4] 吴兴宁,李国军,田继强,等.冀中坳陷碳酸盐岩潜山内幕储层特征及其形成主控因素[J].特种油气藏,2011,18(2):22-25.
WU Xingning,LI Guojun,TIAN Jiqiang,et al.Characteristics of inner buried hill carbonate reservoirs and their main controlling factors in the Jizhong Depression[J].Special Oil ＆ Gas Reservoirs,2011,18(2):22-25.
[5] 胡见义,童晓光,徐树宝.渤海湾盆地古潜山油藏的区域分布规律[J].石油勘探与开发,1981,8(5):1-9.
HU Jianyi,TONG Xiaoguang,XU Shubao.Regional distribution of buried hill reservoirs in the Bohai Bay Basin[J].Petroleum Exploration and Development,1981,8(5):1-9.
[6] 赵宗举.海相碳酸盐岩储集层类型、成藏模式及勘探思路[J].石油勘探与开发,2008,35(6):692-703.
ZHAO Zongju.Types,accumulation models and exploration concepts of marine carbonate reservoirs[J].Petroleum Exploration and Development,2008,35(6):692-703.
[7] 高长海,张新征,查明,等.冀中坳陷潜山油气藏特征[J].岩性油气藏,2011,23(6):6-12.
GAO Changhai,ZHANG Xinzheng,ZHA Ming,et al.Characteristics of buried hill reservoir in Jizhong Depression[J].Lithologic Reservoirs,2011,23(6):6-12.
[8] 吴小洲,牛嘉玉,吴丰成,等.渤海湾盆地奥陶系潜山内幕油气成藏主控因素研究[J].海相油气地质,2013,18(1):1-12.
WU Xiaozhou,NIU Jiayu,WU Fengcheng,et al.Major control factors of hydrocarbon accumulation in Ordovician interior buried hills,Bohaiwan Basin[J].Marine Origin Petroleum Geology,2013,18(1):1-12.
[9] 郭建华,郭原草,王连山.冀中坳陷廊固凹陷河西务构造带潜山储集层特征[J].石油勘探与开发,2009,36(6):701-708.
GUO Jianhua,GUO Yuancao,WANG Lianshan.Features of buried hill reservoirs in Hexiwu structural belt,Langgu Sag,Jizhong Depression[J].Petroleum Exploration and Development,2009,36(6):701-708.
[10] 刘策,曹颖辉,周波,等.古城地区中下奥陶统白云岩碳氧同位素特征及成因[J].特种油气藏,2017,24(2):30-34.
LIU Ce,CAO Yinghui,ZHOU Bo.Carbon and oxygen isotope characteristics and origin of middle-lower Ordovician dolomite in Gucheng Area[J].Special Oil ＆ Gas Reservoir,2017,24(2):30-34.
[11] 于永朋,董春梅,任丽华,等.车西洼陷浊积扇沉积体系对储层成岩作用影响[J].石油化工高等学校学报,2018,38(5):53-60.
YU Yongpeng,Dong Chunmei,REN Lihua,et al.Effect of turbidite fan sedimentary system on reservoir diagenesis in Chexi Sag[J]. Journal of Petrochemical Universities,2018,38(5):53-60.
[12] 宋辉,陈伟,李谋杰,等.基于卷积门控循环单元网络的储层参数预测方法[J].油气地质与采收率,2019,26(5):73-78.
SONG Hui,CHEN Wei,LI Moujie,et al.A method to predict reservoir parameters based on convolutional neural network-gated recurrent unit(CNN-GRU)[J].Petroleum Geology and Recovery Efficiency,2019,26(5):73-78.
[13] 田伟,刘慧卿,何顺利,等.吉木萨尔凹陷芦草沟组致密油储层岩石微观孔隙结构表征[J].油气地质与采收率,2019,26(4):24-32.
TIAN Wei,LIU Huiqing,HE Shunli,et al.Characterization of microscopic pore structure of tight oil reservoirs in Lucaogou Formation,Jimusaer Sag[J].Petroleum Geology and Recovery Efficiency,2019,26(4):24-32.
[14] 王鹏飞,霍春亮,叶小明,等.伊拉克BU油田碳酸盐岩储层沉积过程数值模拟[J].油气地质与采收率,2019,26(4):56-61.
WANG Pengfei,HUO Chunliang,YE Xiaoming,et al.Numerical simulation of sedimentary process for carbonate reservoir in BU Oilfield,Iraq[J].Petroleum Geology and Recovery Efficiency,2019,26(4):56-61.
[15] 周家全,张立强,王香增,等.鄂尔多斯盆地富县地区长₈ 致密砂岩成岩差异性及对储层物性的影响[J].油气地质与采收率,2019,26(3):54-62.
ZHOU Jiaquan,ZHANG Liqiang,WANG Xiangzeng,et al. Diagenetic difference and its influence on reservoir physical properties of Chang₈ tight sandstone in Fuxian area,Ordos Basin[J].Petroleum Geology and Recovery Efficiency,2019,26(3):54-62.
[16] 宋洪亮,李云鹏,刘宗宾,等. 辫状河三角洲前缘亚相储层分布模式分析及应用——以JX油田东块沙河街组为例[J].油气地质与采收率,2018,25(1):37-42.
SONG Hongliang,LI Yunpeng,LIU Zongbin,et al. Understanding and application of reservoir pattern in braided river delta front:a case study of the Shahejie Formation in the east block of JX Oilfield[J].Petroleum Geology and Recovery Efficiency,2018,25(1):37-42.