新疆石油地质

新疆石油地质 ›› 2023, Vol. 44 ›› Issue (5): 554-561.doi: 10.7657/XJPG20230506

• 油气勘探 • 上一篇    下一篇

苏里格气田致密砂岩气藏剩余气分布特征及其挖潜

石耀东1(), 王丽琼1(), 臧苡澄2, 张吉1,3, 李鹏2, 李旭1   

  1. 1.中国石油 长庆油田分公司 第四采气厂，内蒙古 鄂尔多斯 017300
    2.中国石油 长庆油田分公司 勘探开发研究院，西安 710018
    3.低渗透油气田勘探开发国家工程实验室，西安 710018
  • 收稿日期:2022-11-12 修回日期:2023-04-13 出版日期:2023-10-01 发布日期:2023-09-25
  • 通讯作者: 王丽琼（1989-），女，甘肃华池人，高级工程师，硕士，油气田开发，（Tel）0477-7229038（E-mail）wangliqiong12_cq@petrochina.com.cn
  • 作者简介:石耀东（1973-），男，陕西靖边人，高级工程师，气田开发与生产管理，（Tel）0477-7229038（E-mail）syd_cq@petrochina.com.cn
  • 基金资助:
    国家科技重大专项(2016ZX05050);中国石油科技重大专项(2016E-0509)

Distribution and Potential Tapping Strategies of Remaining Gas in Tight Sandstone Gas Reservoirs

SHI Yaodong1(), WANG Liqiong1(), ZANG Yicheng2, ZHANG Ji1,3, LI Peng2, LI Xu1   

  1. 1. No.4 Gas Production Plant, Changqing Oilfield Company, PetroChina, Ordos, Inner Mongolia 017300, China
    2. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an, Shaanxi 710018, China
    3. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi’an, Shaanxi 710018, China
  • Received:2022-11-12 Revised:2023-04-13 Online:2023-10-01 Published:2023-09-25

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摘要：

苏里格气田中区苏36-11区块已开发17年，开发程度和储量动用程度均高，储集层非均质性强，储量动用不均衡，剩余气分布复杂，剩余气分布的确定及挖潜是气田稳产的关键。通过储集层构型精细表征，明确剩余气分布的主要影响因素，确定不同类型剩余气分布规律，提出对应的挖潜对策。研究结果表明：研究区含气砂体主要分布在4级构型单元心滩坝与点坝中，整体规模小，宽度为150~500 m，长度为300~800 m，连通性差，受各级次渗流屏障影响大，区块北东—南西向主砂带开发程度最高，地层压力低，剩余气主要分布在区块西北部盒8段下亚段；剩余气分布主要受储集层非均质与开采非均匀影响，可分为井网未控制型、复合砂体阻流带型、水平井未动用次产层型、直定向井未射开气层型和投产未采出型5类；提出井间加密、老井侧钻、查层补孔和老井挖潜4种动用措施，调整方案后，预测可稳产7年，采收率可达45%。

关键词: 苏里格气田, 致密砂岩, 储集层构型, 剩余气储量评价, 剩余气分布, 挖潜对策, 开发中—后期, 开发调整方案

Abstract:

The Su 36-11 block in the central area of Sulige gas field has been developed for 17 years, with high degrees of development and reserves producing. The strong reservoir heterogeneity in this block leads to uneven producing of reserves and complex distribution of remaining gas. Distribution determination and potential tapping of the remaining gas are crucial for maintaining stable production in the gas field. By accurately characterizing the reservoir architecture, the main factors influencing remaining gas distribution were identified, the distribution patterns of different types of remaining gas were determined, and corresponding strategies for recovering the remaining gas were proposed. The research results show that the gas-bearing sand bodies in the study area are mainly distributed in the 4th-order architecture units, such as channel bar and point bar, these sand bodies are significantly affected by various levels of flow barriers, with small overall scale, poor connectivity, width of 150-500 m and length of 300-800 m. The main NE-SW sand belt in the block has been developed the most, with low formation pressure, and the remaining gas is mainly distributed in the lower He 8 member in the northwestern part of the block. Remaining gas, whose distribution is mainly influenced by reservoir heterogeneity and uneven development, can be divided into five types: gas uncontrolled by well pattern, gas in composite sand body flow barrier, gas in secondary pay zone unexploited by horizontal well, gas in unperforated gas-bearing layer in vertical well, and gas unproduced. Four potential tapping measures were proposed, including well infilling, reperforation, sidetracking and potential tapping in exsisting wells. According to the adjusted development plan, it is predicted that stable production can be maintained for 7 years with the recovery efficiency reaching 45%.

Key words: Sulige gas field, tight sandstone, reservoir architecture, remaining gas reserves evaluation, remaining gas distribution, potential tapping, middle-late development stage, adjusted development plan

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