地学前缘 ›› 2024, Vol. 31 ›› Issue (5): 247-262.DOI: 10.13745/j.esf.sf.2024.6.23

• 碳酸盐岩储层裂缝研究 • 上一篇    下一篇

塔北隆起南斜坡带三道桥气田寒武系裂缝型白云岩储层裂缝期次差异与分布规律

孟庆修1(), 曹自成2,*(), 丁文龙3, 杨德彬1, 马海陇1, 刁新东1, 王明1, 韩鹏远3, 王欢欢4   

  1. 1.中国石化 西北油田分公司 勘探开发研究院, 新疆 乌鲁木齐 830011
    2.中国石化 西北油田分公司, 新疆 乌鲁木齐 830011
    3.中国地质大学(北京) 能源学院, 北京 100083
    4.中国石油 长庆油田分公司, 陕西 西安 710018
  • 收稿日期:2023-11-15 修回日期:2024-05-10 出版日期:2024-09-25 发布日期:2024-10-11
  • 通信作者: * 曹自成(1979—),男,研究员,主要从事油气勘探综合管理与研究工作。E-mail: caozc.xbsj@sinopec.com
  • 作者简介:孟庆修(1989—),男,博士,在站博士后,主要从事含油气盆地与构造分析研究工作。E-mail: mqingxiu@126.com
  • 基金资助:
    国家自然科学基金项目(42072173);国家自然科学基金项目(42372171);中国石化西北油田分公司博士后科研项目(KJ202337)

Fracture stages and distribution patterns in Cambrian fractured dolomite reservoirs, Sandaoqiao gas field

MENG Qingxiu1(), CAO Zicheng2,*(), DING Wenlong3, YANG Debin1, MA Hailong1, DIAO Xindong1, WANG Ming1, HAN Pengyuan3, WANG Huanhuan4   

  1. 1. Research Institute of Exploration and Production, Northwest Oilfield Branch Company, Sinopec, ürümqi 830011, China
    2. Northwest Oilfield Branch Company, Sinopec, ürümqi 830011, China
    3. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    4. Changqing Oilfield Company, PetroChina, Xi’an 710018, China
  • Received:2023-11-15 Revised:2024-05-10 Online:2024-09-25 Published:2024-10-11

摘要:

塔里木盆地北部三道桥气田在深层寒武系发育典型的裂缝型白云岩储层。在岩心、显微镜下、成像测井等多尺度多视角下均显示白云岩储层溶蚀作用弱,构造裂缝是研究区白云岩储层储集空间及物性的主控因素。本研究综合岩心、镜下、显微CT视角下的裂缝交切关系、声发射实验对古构造强度的分析以及区域成岩与埋藏史,得到了研究区主要发育的两期裂缝的差异特征。结果显示:第一期为雁列式高角度裂缝,裂缝宽度大,缝面粗糙,充填胶结严重,主要形成期为加里东晚期—海西早期;第二期呈中-高角度裂缝,裂缝宽度小,缝面平直,多呈半充填,推测形成期为海西晚期—印支期;第二期裂缝交切了先期裂缝,局部错位位移现象明显。通过岩心裂缝线密度和单井裂缝发育段定量参数的统计分析,定量表征了不同构造部位白云岩储层裂缝发育程度,指出了在三道桥气田寒武系白云岩古潜山的挤压褶皱背斜翼部高部位具有最高的裂缝发育程度,挤压褶皱背斜的翼部低部位与挤压向斜裂缝发育程度较低,并建立了研究区非对称挤压褶皱剖面裂缝发育模式。本研究对裂缝期次差异和分布规律的认识可为区域上的裂缝发育期次、有效裂缝识别及特征、裂缝定量分布预测和有利区的评价起到一定的参考意义。

关键词: 裂缝期次, 裂缝定量表征, 裂缝分布规律, 白云岩储层, 寒武系, 三道桥气田

Abstract:

The Sandaoqiao gas field in northern Tarim Basin, southern slope zone of Tabei Uplift, develops typical fractured dolomite reservoirs in deep Cambrian. The dolomite reservoirs show weak dissolution where structural fractures are the main controlling factors of reservoir storage space and physical properties. Through comprehensive analysis of fracture intersections using core logs, microscope, and micro CT, and analysis of the strength of ancient structures through acoustic emission experiments, combined with regional diagenesis and burial history, the characteristics of differential development of two main fracture stages are clarified. The first stage, mostly between the late Caledonian to early Hercynian, forms a wide, high-angle echelon fracture, with rough fracture surface and severe filling and cementation. The second stage, considered between the late Hercynian and Indosinian, forms finer, medium- to high-angle fractures, with straight fracture surface, mostly semi-filled. The intersection between the two stages results in significant local displacement. Through statistical analyses of core fracture densities and single-well fracture development parameters the degree of fracture development in the dolomite reservoirs at different structural locations is quantitatively characterized. The top parts of the limbs of anticlines in the Cambrian dolomite buried hill have the highest degree of fracture development while the lower parts show relatively low fracture development. A fracture development model for asymmetrical anticlines in the research area is established. The understanding of the differences and distribution pattern of fracture stages in this study can provide a reference for the regional fracture development stages, identification/characterization of effective fractures, quantitative prediction of fracture distribution, and evaluation of favorable fracture zones in the study area.

Key words: fracture period, quantitative evidence of fractures, distribution pattern of fractures, dolomite reservoir, Cambrian System, Sandaoqiao gas field

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