石油学报 ›› 2025, Vol. 46 ›› Issue (7): 1327-1341.DOI: 10.7623/syxb202507007

• 地质勘探 • 上一篇    

准噶尔盆地玛湖凹陷风城组常规与非常规储层的孔喉结构和流体可动孔喉下限

何文军1,2, 王国臻2, 陈方文3, 任海姣2, 高岗1, 邹阳2, 韩杨2, 刘新龙2, 余兴2   

  1. 1. 中国石油大学(北京)地球科学学院 北京 102249;
    2. 中国石油新疆油田分公司勘探开发研究院 新疆克拉玛依 834000;
    3. 中国石油大学(华东)地球科学与技术学院 山东青岛 266580
  • 收稿日期:2024-11-08 修回日期:2025-04-22 发布日期:2025-08-08
  • 通讯作者: 陈方文,男,1984年2月生,2012年获东北石油大学矿产普查与勘探专业博士学位,现为中国石油大学(华东)副教授,主要从事非常规油气勘探研究。Email:chenfw@upc.edu.cn
  • 作者简介:何文军,男,1988年4月生,2013年获中国石油大学(北京)矿产普查与勘探专业硕士学位,现为中国石油新疆油田分公司勘探开发研究院高级工程师、中国石油大学(北京)博士研究生,主要从事油气资源评价及油气勘探研究。Email:fchwj@petrochina.com.cn
  • 基金资助:
    新疆维吾尔自治区天山英才-科技创新领军人才支持项目“北疆地区二叠系超级盆地全油气系统地质理论研究与战略接替领域优选”(2022TSYCLJ0070)、中国石油天然气股份有限公司科技重大专项“陆相页岩油规模增储上产与勘探开发技术研究”(2023ZZ15)、中国石油天然气股份有限公司前瞻性基础性研究科技重大项目“准噶尔盆地二叠系全油气系统地质理论与勘探实践”(2021DJ0108)和山东省自然科学基金项目“页岩油原位改质开采”(ZR2022YQ30)资助。

Pore-throat structures and lower limits of fluid-movable pore-throat radii in conventional and unconventional reservoirs of Fengcheng Formation in Mahu sag,Junggar Basin

He Wenjun1,2, Wang Guozhen2, Chen Fangwen3, Ren Haijiao2, Gao Gang1, Zou Yang2, Han Yang2, Liu Xinlong2, Yu Xing2   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Xinjiang Karamay 834000, China;
    3. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China
  • Received:2024-11-08 Revised:2025-04-22 Published:2025-08-08

摘要: 储层孔喉结构和流体可动孔喉半径下限的确定是油气勘探领域的关键问题。基于铸体薄片、低温氮气吸附、高压压汞、核磁共振横向弛豫时间(T2)谱、接触角和油水两相界面张力等实验分析结果,揭示了准噶尔盆地玛湖凹陷下二叠统风城组常规—非常规各类岩性储层的孔喉结构和流体可动孔喉半径下限。研究结果表明:①玛湖凹陷风城组各类岩性储层样品的喉道、孔隙半径的主要分布范围和峰值范围均随着沉积物颗粒粒径的减小而有序地向小尺寸偏移,喉道、孔隙半径由多峰分布向单峰过渡,孔隙的连通性逐渐变差。2风城组储层样品的累积流体可动体积与孔体积的比值随着孔喉半径的增加依次呈现出低值平稳段、上升段和高值平稳段的阶状组合;当储层样品的喉道、孔隙半径呈多峰分布时,具有多个平稳段、上升段和平稳段阶状组合,指示具有大孔缝-小孔或者微裂缝-小孔组合的孔隙结构特征;流体可动孔喉半径下限和流体明显可动孔喉半径均随沉积物颗粒粒径的减小而减小。3力学平衡分析揭示,风城组储层中原油的驱动压力随孔喉半径的减小而呈现出缓慢增加、较快增加和快速增加共3个阶段,原油可动孔喉半径下限随着储层颗粒粒径的减小而减小,随温度升高而减小。研究成果对玛湖凹陷风城组常规和非常规油气资源的可动用潜力评价具有重要指导作用。

关键词: 准噶尔盆地, 玛湖凹陷, 风城组, 孔喉结构, 可动流体

Abstract: To determine the pore-throat structures and the lower limits of fluid-movable pore-throat radii in reservoirs are critical for oil and gas exploration. Based on the experimental results including cast thin section, low-temperature nitrogen adsorption, high-pressure mercury injection, transverse relaxation time (T2) spectra of nuclear magnetic resonance, contact angle, and oil-water interfacial tension, the study determines pore-throat structures and the lower limits of fluid-movable pore-throat radii in various types of conventional and unconventional lithologic reservoirs of Lower Permian Fengcheng Formation in Mahu sag, Junggar Basin. The results show as follows. (1) In Fengcheng Formation of Mahu sag, the primary distribution range and peak value range of the throats and pore radii of various lithologic reservoirs shift to smaller sizes with the decreasing particle sizes of sediments. Meanwhile, throat and pore radius distribution transitions from multimodal to unimodal, and the pore connectivity gradually decreases. (2) As the pore-throat radii increase, the ratio of the cumulative movable fluid volume to the pore volume of Fengcheng Formation reservoir exhibits a stepwise combination from low-value plateau segment to ascending segment to high-value plateau segment. The reservoir samples with multimodal distributions of throats and pore radii, demonstrate multiple stepwise combinations from plateau segment to ascending segment to plateau segment, indicating that the pore structures are characterized by large pores/fractures or micro fractures coupled with small pores. Both the lower limits of fluid-movable and apparent-movable pore-throat radii decrease with the decreasing of sediment particle size. (3) The mechanical equilibrium analysis reveals that the oil displacement pressure in Fengcheng Formation reservoirs show three stages of slow increase, relatively rapid increase and rapid increase as the pore throat radius decreases. The lower limit of movable pore-throat radii of oil decreases with the decrease of reservoir particle size and the increase of temperature. These results are of important guiding significance in the evaluation of the available potential of conventional and unconventional oil and gas resources in Fengcheng Formation of Mahu sag.

Key words: Junggar Basin, Mahu sag, Fengcheng Formation, pore-throat structure, movable fluid

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