新疆石油地质

新疆石油地质 ›› 2025, Vol. 46 ›› Issue (1): 48-56.doi: 10.7657/XJPG20250106

• 油气勘探 • 上一篇    下一篇

准噶尔盆地永进—征沙村地区侏罗系超深层致密砂岩储集层分级评价

王春伟1,2(), 杨俊3, 赵东睿4, 杜焕福1,2, 孙鑫1,2(), 王晔磊1,2, 孟方华5   

  1. 1.中石化经纬有限公司 地质测控技术研究院，山东 青岛 266071
    2.中国石化 测录井重点实验室，山东 青岛 266071
    3.中国石油 长庆油田分公司 第五采油厂，西安 718600
    4.中国石油 长庆油田分公司 第二采油厂，甘肃 庆阳 745100
    5.中石化经纬有限公司 胜利地质录井公司，山东 东营 257100
  • 收稿日期:2024-08-27 修回日期:2024-09-19 出版日期:2025-02-01 发布日期:2025-01-24
  • 通讯作者: 孙鑫（1994-），男，山东潍坊人，副研究员，博士，油气田开发，（Tel）0532-58929956（Email）upcsunxin@163.com
  • 作者简介:王春伟（1988-），男，山东滨州人，高级工程师，硕士，石油地质，（Tel）15264252717（Email）584019559@qq.com
  • 基金资助:
    中国石化科技部项目(P24132);中国石化科技部项目(P24222)

Grading Evaluation of Jurassic Ultra-Deep Tight Sandstone Reservoirs in Yongjin-Zhengshacun Area, Junggar Basin

WANG Chunwei1,2(), YANG Jun3, ZHAO Dongrui4, DU Huanfu1,2, SUN Xin1,2(), WANG Yelei1,2, MENG Fanghua5   

  1. 1. Research Institute of Geological Measurement and Control Technology, Sinopec Matrix Co., Ltd., Qingdao, Shandong 266071, China
    2. Key Laboratory of Well Logging and Measurement, Sinopec, Qingdao, Shandong 266071, China
    3. No.5 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi’an, Shaanxi 718600, China
    4. No.2 Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang, Gansu 745100, China
    5. Shengli Geological Logging Company, Sinopec Matrix Co., Ltd., Dongying, Shandong 257100, China
  • Received:2024-08-27 Revised:2024-09-19 Online:2025-02-01 Published:2025-01-24

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摘要：

准噶尔盆地永进—征沙村地区侏罗系超深层砂岩储集层致密且非均质性强，储集层评价标准及有利储集层分布不明确，制约了油气勘探开发。以测井、录井、岩心及试油资料为基础，通过矿物分析、核磁共振、毛细管压力实验、岩心驱替等，开展了侏罗系储集层微观孔隙结构特征研究，明确了可动孔隙半径下限，并以流体可动孔隙度作为关键评价指标建立了分级评价标准。研究表明：研究区中—细粒岩屑砂岩、长石岩屑砂岩储集空间为粒间孔、次生溶蚀孔及微裂缝，孔隙半径较小，为0.005~5.000 μm，以毛细管压力实验曲线标定后不同驱替状态的核磁共振T2谱确定了可动孔隙半径下限为0.100 μm，进而明确了含油岩石的流体可动孔隙度。综合考虑岩电特征、孔隙类型及结构、含油性特征，结合典型井的产能特征，建立了研究区储集层分级评价标准，通过Ⅰ类、Ⅱ类和Ⅲ类储集层的分级评价，为后续油气田开发及井位部署提供了依据，对于该地区超深层致密油藏的勘探开发与邻区储集层评价具有参考意义。

关键词: 准噶尔盆地, 永进—征沙村地区, 侏罗系, 超深层, 致密砂岩储集层, 分级评价

Abstract:

The Jurassic ultra-deep sandstone reservoirs in the Yongjin-Zhengshacun area of the Junggar Basin are tight and heterogeneous, and the standards for evaluating these reservoirs and the favorable reservoir distribution are unclear, restricting oil and gas exploration and development. Based on well logging, coring, and testing data, and by using mineral analysis, nuclear magnetic resonance (NMR), capillary pressure experiments, and core displacement tests, a study was conducted on the pore structure of the Jurassic reservoirs. The lower limit of movable pore radius was determined, and a grading evaluation standard was established with movable fluid porosity as the key indicator. The results show that the reservoir space in the medium- to fine-grained lithic and feldspathic sandstones is composed of intergranular pores, secondary dissolution pores, and microfractures, with small pore radii ranging from 0.005 to 5.000 μm. After calibrating the experimental capillary pressure curves, the lower limit of movable pore radius was determined as 0.100 μm through the NMR T2 spectrum at different displacement states, and then the movable fluid porosity of oil-bearing rocks was clarified. By comprehensively considering the lithoelectric characteristics, pore type and structure, and oil-bearing property, and combining the productivity characteristics of typical wells, a grading reservoir evaluation standard for the study area was established. Based on the standard the reservoirs were classified into Class Ⅰ, Class Ⅱ, and Class Ⅲ. The evaluation provides a basis for subsequent oil and gas field development and well deployment, and offers valuable insights for the exploration and development of ultra-deep tight oil reservoirs in the study area and for reservoir evaluation in neighboring areas.

Key words: Junggar Basin, Yongjin-Zhengshacun area, Jurassic, ultra-deep layer, tight sandstone reservoir, grading evaluation

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