岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 158–171.doi: 10.12108/yxyqc.20230315

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地合水地区三叠系长7段夹层型页岩油储层特征及主控因素

曹江骏1,2, 王茜3, 王刘伟4, 李诚1,2, 石坚1,2, 陈朝兵5   

  1. 1. 中国石油长庆油田分公司 勘探开发研究院, 西安 710018;
    2. 低渗透油气田勘探开发国家工程实验室, 西安 710018;
    3. 中国石油长庆油田分公司 第十二采油厂, 甘肃 合水 745400;
    4. 中国石油长庆油田分公司 第二采气厂, 西安 712100;
    5. 西安石油大学 地球科学与工程学院, 西安 710065
  • 收稿日期:2022-11-25 修回日期:2022-12-20 出版日期:2024-05-01 发布日期:2024-04-30
  • 第一作者:曹江骏（1993—），男，博士，工程师，主要从事沉积学与储层地质学方面的研究工作。地址:（710018）陕西省西安市未央区未央路 151 号。Email:282945358@qq.com。
  • 通信作者: 陈朝兵（1984—），男，博士，副教授，主要从事沉积学及开发地质学方面的研究工作。Email:395286273@qq.com。
  • 基金资助:
    “十三五”国家科技重大专项“中生界低渗透储层非均质性评价技术”（编号：2016ZX05050006）与国家自然科学基金青年科学基金项目“深水相高杂基对致密砂岩微观孔喉结构及渗流能力影响评价”（编号：41802140）联合资助。

Characteristics and main controlling factors of interbedded shale oil reservoirs of Triassic Chang 7 member in Heshui area，Ordos Basin

CAO Jiangjun1,2, WANG Xi3, WANG Liuwei4, LI Cheng1,2, SHI Jian1,2, CHEN Zhaobing5   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Field, Xi'an 710018, China;
    3. No. 12 Oil Production Plant, PetroChina Changqing Oilfield Company, Heshui 745400, Gansu, China;
    4. No. 2 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 712100, China;
    5. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2022-11-25 Revised:2022-12-20 Online:2024-05-01 Published:2024-04-30

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摘要： 运用铸体薄片、扫描电镜、黏土矿物 X 射线衍射、电子探针、阴极发光、高压压汞、物性测试等资料，对鄂尔多斯盆地西南部合水地区三叠系延长组长 7 段夹层型页岩油储层特征及储层致密化主控因素进行了研究，建立了储层定量评价标准，并预测出有利储层分布。研究结果表明：①鄂尔多斯盆地合水地区三叠系长 7 段夹层型页岩油储层主要为岩屑长石砂岩与长石岩屑砂岩，成分成熟度低、填隙物含量高、孔喉结构复杂，具有高孔低渗特征。②胶结作用是研究区长 7 段夹层型页岩油储层致密化的主控因素，储层平均视胶结率为 86.3%，达到强胶结程度，以自生黏土矿物中的伊利石胶结为主；压实作用对储层致密化起次要作用，储层平均视压实率为 46.0%，为中等压实程度；溶蚀作用降低了储层的致密化程度，但储层渗流能力较低，酸性流体难以大规模溶蚀，平均视溶蚀率仅为 13.8%，为弱溶蚀程度。③受中等压实—弱溶蚀—强胶结成岩作用的影响，储层非均质性较强，成岩系数差异较大。Ⅰ类储层成岩系数大于 2.4，Ⅱ1类储层成岩系数为 1.8~2.4，Ⅱ2类储层成岩系数为 1.2~＜1.8，Ⅲ类储层成岩系数小于 1.2，Ⅰ类与Ⅱ1类储层为有利储层。区域上中部混源区有利储层发育规模最大，是勘探的主要目标区。

关键词: 页岩油储层, 致密化, 强胶结作用, 成岩系数, 长7段, 延长组, 三叠系, 合水地区, 鄂尔多斯盆地

Abstract: Based on the data of cast thin sections, scanning electron microscopy, clay mineral X-ray diffraction, electron probe, cathodoluminescence, high-pressure mercury injection and physical properties testing, the cha- racteristics and main controlling factors of reservoir densification of the interbedded shale oil reservoirs of Triassic Chang 7 member in Heshui area of Ordos Basin were studied, a quantitative evaluation standard of the reservoirs was established, and favorable reservoirs distribution was predicted. The results show that:（1）The interbedded shale oil reservoirs of Triassic Chang 7 member in Heshui area of Ordos Basin are mainly composed of lithic feldsparthic sandstone and feldspathic litharenite, with low compositional maturity, high interstitial content, complex pore throat structure, high porosity and low permeability.（2）Cementation is the main controlling factor for the densification of the interbedded shale oil reservoirs of Chang 7 member in the study area, with an average apparent cementation rate of 86.3%, reaching a strong degree of cementation, and dominated by illite cementation in authigenic clay minerals. Compaction has relatively low effect on the reservoir densification, with an average apparent compaction rate of 46.0%, reaching medium compaction degree. Dissolution reduces the degree of the reservoir densification, but the reservoir seepage ability is low, making it difficult for acidic fluids to undergo large-scale dissolution. The average apparent dissolution rate is only 13.8%, indicating a weak degree of dissolution.（3）Due to the influence of medium compaction, weak dissolution and strong cementation, the reservoir heterogeneity is strong, and the diagenetic coefficients vary greatly. The type-Ⅰ reservoirs have a diagenetic coefficient greater than 2.4, the diagenetic coefficients of the type-Ⅱ1 and type-Ⅱ2 reservoirs range from 1.8 to 2.4 and 1.2 to 1.8, respectively, and the diagenetic coefficient of the type-Ⅲ reservoirs is less than 2.4. Among them, type-Ⅰ and type-Ⅱ1 are favorable reservoirs. The central mixed source area in the study area has the largest scale of favorable reservoir development, so it is the main target area for exploration.

Key words: shale oil reservoir, densification, strong cementation, diagenetic coefficient, Chang 7 member, Yanchang Formation, Triassic, Heshui area, Ordos Basin

中图分类号: 

  • TE112.23
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