Volume 46 Issue 5
Sep.  2024
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XIONG Liang, DONG Xiaoxia, WANG Tong, WEI Limin, OUYANG Jiasui, WANG Baobao, FENG Shaoke. Reassessment of exploration directions of continental shale oil in Lower Jurassic Da'anzhai Member in northern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 989-1001. doi: 10.11781/sysydz202405989
Citation: XIONG Liang, DONG Xiaoxia, WANG Tong, WEI Limin, OUYANG Jiasui, WANG Baobao, FENG Shaoke. Reassessment of exploration directions of continental shale oil in Lower Jurassic Da'anzhai Member in northern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 989-1001. doi: 10.11781/sysydz202405989

Reassessment of exploration directions of continental shale oil in Lower Jurassic Da'anzhai Member in northern Sichuan Basin

doi: 10.11781/sysydz202405989
  • Received Date: 2023-12-06
  • Rev Recd Date: 2024-08-02
  • Publish Date: 2024-09-28
  • The Da'anzhai Member of the Lower Jurassic in northern Sichuan Basin is one of the major oil-bearing formations in the basin. In recent years, with the development of unconventional exploration theories, exploration efforts have shifted towards the shale reservoirs in the Da'anzhai Member, enhancing the understanding of the exploration directions for continental shale oil in northern Sichuan. Based on the data from shale oil exploration wells LY1 and YY2, including core samples, experiments, drilling, and fracturing data, a reassessment of the oil and gas formation conditions, resource potential, and engineering geological conditions was conducted. The results indicate that: (1) The second submember of the Da'anzhai Member in Langzhong has a good resource base and formation conditions, indicating great exploration potential. The second submember mainly develops three lithologies: shale, shell limestone, and shale interbedded with shell limestone. The shale exhibits good hydro- carbon source quality and is generally in a middle to high-mature stage. Its hydrocarbon production intensity is (20-90)×104 t/km2, and the retained hydrocarbon accounts for 66% to 78% of the total hydrocarbon production, with a shale oil resource amounting to 3.26×108 t. (2) The shale samples from the second submember in the study area have poorly developed fracture networks, characterized by poor permeability conditions, difficult drilling and compressibility conditions. The matrix-type shale oil has high crude oil viscosity and high wax content. The coupling configuration relationship between the permeability of the shale samples and the fluidity of the shale oil is key to achieving high production in target layers. (3) Given the current poor production results in matrix-type shale exploration, it is recommended to adopt a combined conventional and unconventional exploration method to study the formation system of the shale and limestone interlayer reservoirs in the research area, considering high-quality shale and fracture-porosity type limestone as favorable exploration targets. Through the integration of geological and engineering research methods, efforts should be made to tackle technical challenges related to drillability, compressibility, and production, thereby improving engineering and technological levels.

     

  • Author XIONG Liang is an Editorial Board Member of this journal. He did not take part in peer review or decision making of this article.
    XIONG Liang and DONG Xiaoxia contributed to the overall conceptualization and revision of the article. WANG Tong and WEI Limin contributed to the writing and structure of the paper. The writing and revision were completed by OUYANG Jiasui and WANG Baobao. The writing, editing, and submission of the paper was handled by FENG Shaoke. All authors have read the last version of the paper and consented to its submission.
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  • [1]
    邹才能, 杨智, 王红岩, 等. "进源找油": 论四川盆地非常规陆相大型页岩油气田[J]. 地质学报, 2019, 93(7): 1551-1562.

    ZOU Caineng, YANG Zhi, WANG Hongyan, et al. "Exploring petroleum inside source kitchen": Jurassic unconventional continental giant shale oil & gas field in Sichuan Basin, China[J]. Acta Geologica Sinica, 2019, 93(7): 1551-1562.
    [2]
    高阳, 叶义平, 何吉祥, 等. 准噶尔盆地吉木萨尔凹陷陆相页岩油开发实践[J]. 中国石油勘探, 2020, 25(2): 133-141.

    GAO Yang, YE Yiping, HE Jixiang, et al. Development practice of continental shale oil in Jimsar Sag in the Junggar Basin[J]. China Petroleum Exploration, 2020, 25(2): 133-141.
    [3]
    马永生, 蔡勋育, 赵培荣, 等. 中国陆相页岩油地质特征与勘探实践[J]. 地质学报, 2022, 96(1): 155-171.

    MA Yongsheng, CAI Xunyu, ZHAO Peirong, et al. Geological characteristics and exploration practices of continental shale oil in China[J]. Acta Geologica Sinica, 2022, 96(1): 155-171.
    [4]
    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.
    [5]
    方志坚, 巴晶, 熊繁升, 等. 利用机器学习与改进岩石物理模型预测页岩油层系横波速度[J]. 石油地球物理勘探, 2024, 59(3): 381-391.

    FANG Zhijian, BA Jing, XIONG Fansheng, et al. Shear wave velo-city prediction of shale oil formations based on machine learning and improved rock physics model[J]. Oil Geophysical Prospecting, 2024, 59(3): 381-391.
    [6]
    丁佳彤, 陈孔全, 汤济广, 等. 页岩气富集与保存条件差异研究: 以焦石坝—武隆地区为例[J]. 石油地球物理勘探, 2023, 58(6): 1472-1480.

    DING Jiatong, CHEN Kongquan, TANG Jiguang, et al. A study on differences of shale gas enrichment and preservation conditions: taking the Jiaoshiba-Wulong area as an example[J]. Oil Geophysical Prospecting, 2023, 58(6): 1472-1480.
    [7]
    崔航, 朱世发, 施振生, 等. 川北侏罗系大安寨段湖相混积层系沉积特征与发育模式[J]. 古地理学报, 2022, 24(6): 1099-1113.

    CUI Hang, ZHU Shifa, SHI Zhensheng, et al. Sedimentary characteristics and development model of lacustrine fine-grained hybrid sedimentary rocks in the Jurassic Da'anzhai Member, northern Sichuan Basin[J]. Journal of Palaeogeography, 2022, 24(6): 1099-1113.
    [8]
    杨跃明, 黄东. 四川盆地侏罗系湖相页岩油气地质特征及勘探开发新认识[J]. 天然气工业, 2019, 39(6): 22-33.

    YANG Yueming, HUANG Dong. Geological characteristics and new understandings of exploration and development of Jurassic lacustrine shale oil and gas in the Sichuan Basin[J]. Natural Gas Industry, 2019, 39(6): 22-33.
    [9]
    鄢彬, 舒能益, 杨雷, 等. 川北石龙场—柏垭油田油气层开发潜力评价方法及应用[J]. 地质力学学报, 2005, 11(3): 235-244.

    YAN Bin, SHU Nengyi, YANG Lei, et al. A method for evaluating the production potential of reservoirs in the Shilongchang-Baiya oilfield in northern Sichuan and its application[J]. Journal of Geomechanics, 2005, 11(3) : 235-244.
    [10]
    周德华, 孙川翔, 刘忠宝, 等. 川东北地区大安寨段陆相页岩气藏地质特征[J]. 中国石油勘探, 2020, 25(5): 32-42.

    ZHOU Dehua, SUN Chuanxiang, LIU Zhongbao, et al. Geological characteristics of continental shale gas reservoir in the Jurassic Da'anzhai Member in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2020, 25(5): 32-42.
    [11]
    杨光, 黄东, 黄平辉, 等. 四川盆地中部侏罗系大安寨段致密油高产稳产主控因素[J]. 石油勘探与开发, 2017, 44(5): 817-826.

    YANG Guang, HUANG Dong, HUANG Pinghui, et al. Control factors of high and stable production of Jurassic Da'anzhai Member tight oil in central Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2017, 44(5): 817-826.
    [12]
    黄东, 杨光, 韦腾强, 等. 川中桂花油田大安寨段致密油高产稳产再认识[J]. 西南石油大学学报(自然科学版), 2015, 37(5): 23-32.

    HUANG Dong, YANG Guang, WEI Tengqiang, et al. Recognition of high yield and stable yield factors of Daanzhai tight oil, Guihua oilfield[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2015, 37(5): 23-32.
    [13]
    郭旭升, 胡东风, 李宇平, 等. 海相和湖相页岩气富集机理分析与思考: 以四川盆地龙马溪组和自流井组大安寨段为例[J]. 地学前缘, 2016, 23(2): 18-28.

    GUO Xusheng, HU Dongfeng, LI Yuping, et al. Analyses and thoughts on accumulation mechanisms of marine and lacustrine shale gas: a case study in shales of Longmaxi Formation and Da'anzhai Section of Ziliujing Formation in Sichuan Basin[J]. Earth Science Frontiers, 2016, 23(2): 18-28.
    [14]
    倪楷. 元坝地区大安寨段页岩气藏的形成条件[J]. 天然气技术与经济, 2012, 6(4): 13-16.

    NI Kai. Shale-gas reservoir-forming conditions in Daanzhai Section, Yuanba area[J]. Natural Gas Technology and Economy, 2012, 6(4): 13-16.
    [15]
    魏祥峰, 黄静, 李宇平, 等. 元坝地区大安寨段陆相页岩气富集高产主控因素[J]. 中国地质, 2014, 41(3): 970-981.

    WEI Xiangfeng, HUANG Jing, LI Yuping, et al. The main factors controlling the enrichment and high production of Da'anzhai Member continental shale gas in Yuanba area[J]. Geology in China, 2014, 41(3): 970-981.
    [16]
    彭嫦姿, 彭俊, 陈燕辉, 等. 四川盆地元坝地区大安寨段页岩气"甜点"地震预测[J]. 天然气工业, 2014, 34(6): 42-47.

    PENG Changzi, PENG Jun, CHEN Yanhui, et al. Seismic prediction of sweet spots in the Da'anzhai shale play, Yuanba area, Sichuan Basin[J]. Natural Gas Industry, 2014, 34(6): 42-47.
    [17]
    冯动军. 四川盆地侏罗系大安寨段陆相页岩油气地质特征及勘探方向[J]. 石油实验地质, 2022, 44(2): 219-230. doi: 10.11781/sysydz202202219

    FENG Dongjun. Geological characteristics and exploration direction of continental shale gas in Jurassic Daanzhai Member, Sichuan Basin[J]. Petroleum Geology & Experiment, 2022, 44(2): 219-230. doi: 10.11781/sysydz202202219
    [18]
    杨建, 杨斌, 王良, 等. 川中大安寨段页岩油储层基质孔隙压裂液渗吸驱油侵入深度研究[J]. 油气地质与采收率, 2023, 30(5): 84-91.

    YANG Jian, YANG Bin, WANG Liang, et al. Invasion depths of fracturing fluid imbibition displacement in matrix pores of Da'an Zhai shale oil reservoirs in central Sichuan Basin[J]. Petroleum Geology and Recovery Efficiency, 2023, 30(5): 84-91.
    [19]
    刘苗苗, 付小平. 元坝地区陆相页岩气勘探潜力再评价[J]. 四川地质学报, 2020, 40(3): 416-421.

    LIU Miaomiao, FU Xiaoping. Reevaluation of exploration potential of continental shale gas in the Yuanba area[J]. Acta Geologica Sichuan, 2020, 40(3): 416-421.
    [20]
    刘忠宝, 李倩文, 刘光祥, 等. 川北地区大安寨段页岩油气源、储特征及富集层段优选[J]. 地质学报, 2023, 97(10): 3421-3437.

    LIU Zhongbao, LI Qianwen, LIU Guangxiang, et al. Source and reservoir characteristics as well as optimization of favorable shale oil and gas enrichment intervals of the Da'anzhai Member in northern Sichuan[J]. Acta Geologica Sinica, 2023, 97(10): 3421-3437.
    [21]
    杨跃明, 文龙, 王兴志, 等. 四川盆地下侏罗统大安寨段页岩油气地质特征及勘探有利区优选[J]. 天然气工业, 2023, 43(4): 32-42.

    YANG Yueming, WEN Long, WANG Xingzhi, et al. Geological characteristics and favorable exploration area selection of shale oil and gas of the Lower Jurassic Da'anzhai Member in the Sichuan Basin[J]. Natural Gas Industry, 2023, 43(4): 32-42.
    [22]
    金涛, 白蓉, 郭蕊莹, 等. 四川盆地侏罗系常规与非常规油藏类型探讨[J]. 天然气与石油, 2021, 39(3): 73-81.

    JIN Tao, BAI Rong, GUO Ruiying, et al. Discussion on conventional and unconventional Jurassic reservoir types in Sichuan Basin[J]. Natural Gas and Oil, 2021, 39(3): 73-81.
    [23]
    杨跃明, 黄东, 杨光, 等. 四川盆地侏罗系大安寨段湖相页岩油气形成地质条件及勘探方向[J]. 天然气勘探与开发, 2019, 42(2): 1-12.

    YANG Yue, HUANG Dong, YANG Guang, et al. Geological conditions to form lacustrine facies shale oil and gas of Jurassic Daanzhai Member in Sichuan Basin and exploration directions[J]. Natural Gas Exploration and Development, 2019, 42(2): 1-12.
    [24]
    黄东, 段勇, 李育聪, 等. 淡水湖相页岩油气有机碳含量下限研究: 以四川盆地侏罗系大安寨段为例[J]. 中国石油勘探, 2018, 23(6): 38-45.

    HUANG Dong, DUAN Yong, LI Yucong, et al. Study on the TOC lower limit of shale oil and gas of freshwater lake facies: a case study on the Jurassic Da'anzhai Member in the Sichuan Basin[J]. China Petroleum Exploration, 2018, 23(6): 38-45.
    [25]
    何登发, 李德生, 张国伟, 等. 四川多旋回叠合盆地的形成与演化[J]. 地质科学, 2011, 46(3): 589-606.

    HE Dengfa, LI Desheng, ZHANG Guowei, et al. Formation and evolution of multi-cycle superposed Sichuan Basin, China[J]. Chinese Journal of Geology, 2011, 46(3): 589-606.
    [26]
    李英强, 何登发. 四川盆地及邻区早侏罗世构造—沉积环境与原型盆地演化[J]. 石油学报, 2014, 35(2): 219-232.

    LI Yingqiang, HE Dengfa. Evolution of tectonic-depositional environment and prototype basins of the Early Jurassic in Sichuan Basin and adjacent areas[J]. Acta Petrolei Sinica, 2014, 35(2): 219-232.
    [27]
    冯荣昌, 吴因业, 杨光, 等. 川中大安寨段风暴沉积特征及分布模式[J]. 沉积学报, 2015, 33(5): 909-918.

    FENG Rongchang, WU Yinye, YANG Guang, et al. Storm deposition of the Da'anzhai Member (Jurassic) in central Sichuan Basin[J]. Acta Sedimentologica Sinica, 2015, 33(5): 909-918.
    [28]
    朱彤, 龙胜祥, 王烽, 等. 四川盆地湖相泥页岩沉积模式及岩石相类型[J]. 天然气工业, 2016, 36(8): 22-28.

    ZHU Tong, LONG Shengxiang, WANG Feng, et al. Sedimentary models and lithofacies types of lacustrine mud shale in the Sichuan Basin[J]. Natural Gas Industry, 2016, 36(8): 22-28.
    [29]
    李克, 葸克来, 操应长, 等. 湖相细粒沉积岩中晶粒方解石成因及其对火山—热液活动的指示: 以吉木萨尔凹陷二叠系芦草沟组为例[J]. 石油勘探与开发, 2023, 50(3): 541-552.

    LI Ke, XI Kelai, CAO Yingchang, et al. Genesis of granular calcite in lacustrine fine-grained sedimentary rocks and its indication to volcanic-hydrothermal events: a case study of Permian Lucaogou Formation in Jimusar Sag, Junggar Basin, NW China[J]. Petroleum Exploration and Development, 2023, 50(3): 541-552.
    [30]
    辛红刚, 田杨, 冯胜斌, 等. 鄂尔多斯盆地典型夹层型页岩油地质特征及潜力评价: 以宁228井长7段为例[J]. 地质科技通报, 2023, 42(3): 114-124.

    XIN Honggang, TIAN Yang, FENG Shengbin, et al. Geological characteristics and potential evaluation of typical interlayer shale oil in the Ordos Basin: a case study of the Chang 7 Member of well Ning228[J]. Bulletin of Geological Science and Technology, 2023, 42(3): 114-124.
    [31]
    王文广, 林承焰, 郑民, 等. 致密油/页岩油富集模式及资源潜力: 以黄骅坳陷沧东凹陷孔二段为例[J]. 中国矿业大学学报, 2018, 47(2): 332-344.

    WANG Wenguang, LIN Chengyan, ZHENG Min, et al. Enrichment patterns and resource prospects of tight oil and shale oil: a case study of the second member of Kongdian Formation in the Cangdong Sag Huanghua Depression[J]. Journal of China University of Mining & Technology, 2018, 47(2): 332-344.
    [32]
    刘雅利, 刘鹏. 陆相富有机质泥页岩中夹层特征及其作用: 以济阳坳陷为例[J]. 油气地质与采收率, 2019, 26(5): 1-9.

    LIU Yali, LIU Peng. Interlayer characteristics and their effect on continental facies organic-rich shale: a case study of Jiyang Depression[J]. Petroleum Geology and Recovery Efficiency, 2019, 26(5): 1-9.
    [33]
    柯钦, 王雷, 张莹, 等. 松辽盆地南部青一段泥页岩层系地质特征及页岩油有利勘探区带划分[J]. 石油地球物理, 2022, 57 (S1): 97-103.

    KE Qin, WANG Lei, ZHANG Ying, et al. Geological characteristics of mud shale series in Qing 1 member in southern Songliao Basin and division of favorable zones for shale oil exploration[J]. Oil Geophysical Prospecting, 2022, 57 (S1): 97-103.
    [34]
    金旭, 李国欣, 孟思炜, 等. 陆相页岩油可动用性微观综合评价[J]. 石油勘探与开发, 2021, 48(1): 222-232.

    JIN Xu, LI Guoxin, MENG Siwei, et al. Microscale comprehensive evaluation of continental shale oil recoverability[J]. Petroleum Exploration and Development, 2021, 48(1): 222-232.
    [35]
    李楠, 洪海涛, 李国辉, 等. 四川盆地高陡构造区凉高山组页岩油气地质特征[J]. 天然气勘探与开发, 2022, 45(4): 86-95.

    LI Nan, HONG Haitao, LI Guohui, et al. Geological characteristics of shale oil and gas of Lianggaoshan Formation in high-steep structural zone, Sichuan Basin[J]. Natural Gas Exploration and Development, 2022, 45(4): 86-95.
    [36]
    赵文智, 卞从胜, 李永新, 等. 陆相页岩油可动烃富集因素与古龙页岩油勘探潜力评价[J]. 石油勘探与开发, 2023, 50(3): 455-467.

    ZHAO Wenzhi, BIAN Congsheng, LI Yongxin, et al. Enrichment factors of movable hydrocarbons in lacustrine shale oil and exploration potential of shale oil in Gulong Sag, Songliao Basin, NE China[J]. Petroleum Exploration and Development, 2023, 50(3): 455-467.
    [37]
    赵贤正, 金凤鸣, 周立宏, 等. 渤海湾盆地风险探井歧页1H井沙河街组一段页岩油勘探突破及其意义[J]. 石油学报, 2022, 43(10): 1369-1382.

    ZHAO Xianzheng, JIN Fengming, ZHOU Lihong, et al. Breakthrough and significance of shale oil exploration in member 1 of Shahejie Formation of well Qiye 1H, a risk exploratory well in Bohai Bay Basin[J]. Acta Petrolei Sinica, 2022, 43(10): 1369-1382.
    [38]
    刘惠民, 李军亮, 刘鹏, 等. 济阳坳陷古近系页岩油富集条件与勘探战略方向[J]. 石油学报, 2022, 43(12): 1717-1729.

    LIU Huimin, LI Junliang, LIU Peng, et al. Enrichment conditions and strategic exploration direction of Paleogene shale oil in Jiyang Depression[J]. Acta Petrolei Sinica, 2022, 43(12): 1717-1729.
    [39]
    祝海华, 陈琳, 曹正林, 等. 川中地区侏罗系自流井组大安寨段黑色页岩孔隙微观特征及主控因素[J]. 石油与天然气地质, 2022, 43(5): 1115-1126.

    ZHU Haihua, CHEN Lin, CAO Zhenglin, et al. Microscopic pore characteristics and controlling factors of black shale in the Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin[J]. Oil & Gas Geology, 2022, 43(5): 1115-1126.
    [40]
    方锐, 蒋裕强, 杨长城, 等. 四川盆地侏罗系凉高山组页岩油地质特征[J]. 中国石油勘探, 2023, 28(4): 66-78.

    FANG Rui, JIANG Yuqiang, YANG Changcheng, et al. Geological characteristics of shale oil in the Jurassic Lianggaoshan Formation in Sichuan Basin[J]. China Petroleum Exploration, 2023, 28(4): 66-78.
    [41]
    梁狄刚, 冉隆辉, 戴弹申, 等. 四川盆地中北部侏罗系大面积非常规石油勘探潜力的再认识[J]. 石油学报, 2011, 32(1): 8-17.

    LIANG Digang, RAN Longhui, DAI Tanshen, et al. A re-recognition of the prospecting potential of Jurassic large-area and non-conventional oils in the central-northern Sichuan Basin[J]. Acta Petrolei Sinica, 2011, 32(1): 8-17.
    [42]
    汪少勇, 李建忠, 李登华, 等. 川中地区公山庙油田侏罗系大安寨段致密油资源潜力分析[J]. 中国地质, 2013, 40(2): 477-486.

    WANG Shaoyong, LI Jiangzhong, LI Dengfa, et al. The potential of tight oil resource in Jurassic Da'anzhai Formation of the Gongshanmiao oil field, central Sichuan Basin[J]. Geology in China, 2013, 40(2): 477-486.
    [43]
    韩克猷, 王毓俊, 查全衡. 川中侏罗系勘探潜力及勘探目标再认识[J]. 石油科技论坛, 2015, 34(6): 51-57.

    HAN Keyou, WANG Yujun, ZHA Quanheng. Exploration potential and targets of Jurassic system in central Sichuan[J]. Petroleum Science and Technology Forum, 2015, 34(6): 51-57.
    [44]
    WANG Enze, LIU Guoyong, PANG Xiongqi, et al. An improved hydrocarbon generation potential method for quantifying hydrocarbon generation and expulsion characteristics with application example of Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin[J]. Marine and Petroleum Geology, 2020, 112: 104106.
    [45]
    CHEN Zhuoheng, JIANG Chunqing. A data driven model for studying kerogen kinetics with application examples from Canadian sedimentary basins[J]. Marine and Petroleum Geology, 2015, 67: 795-803.
    [46]
    刘惠民, 于炳松, 谢忠怀, 等. 陆相湖盆富有机质页岩微相特征及对页岩油富集的指示意义: 以渤海湾盆地济阳坳陷为例[J]. 石油学报, 2018, 39(12): 1328-1343.

    LIU Huimin, YU Bingsong, XIE Zhonghuai, et al. Characteristics and implications of micro lithofacies in lacustrine-basin organic-rich shale: a case study of Jiyang Depression, Bohai Bay Basin[J]. Acta Petrolei Sinica, 2018, 39(12) : 1328-1343.
    [47]
    何文渊, 蒙启安, 冯子辉, 等. 松辽盆地古龙页岩油原位成藏理论认识及勘探开发实践[J]. 石油学报, 2022, 43(1): 1-14.

    HE Wenyuan, MENG Qi'an, FENG Zihui, et al. In-situ accumulation theory and exploration & development practice of Gulong shale oil in Songliao Basin[J]. Acta Petrolei Sinica, 2022, 43(1): 1-14.
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