石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (1): 243-255.doi: 10.11743/ogg20240117

• 方法技术 • 上一篇    

奥连特盆地隐蔽油藏高效滚动勘探开发方法技术及应用

王光付1(), 李发有1, 孙建芳1, 徐海1, 张亚雄1, 冯玉良2, 丁峰1, 叶双江1, 陈诗望1, 吴洁1, 孙钰1   

  1. 1.中国石化 石油勘探开发研究院,北京 102206
    2.中国石化 国际石油勘探开发有限公司,北京 100029
  • 收稿日期:2023-11-18 修回日期:2023-12-25 出版日期:2024-02-01 发布日期:2024-02-29
  • 第一作者简介:王光付(1965—),男,博士、教授级高级工程师,油气田开发。E‑mail: wanggf.syky@sinopec.com
  • 基金项目:
    中国石化科技部基金项目(P23180)

Efficient progressive exploration and exploitation technology for subtle reservoirs in the Oriente Basin and its applications to blocks 14 and 17 in Ecuador

Guangfu WANG1(), Fayou LI1, Jianfang SUN1, Hai XU1, Yaxiong ZHANG1, Yuliang FENG2, Feng DING1, Shuangjiang YE1, Shiwang CHEN1, Jie WU1, Yu SUN1   

  1. 1.Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China
    2.International Petroleum Exploration and Production Corporation, SINOPEC, Beijing 100029, China
  • Received:2023-11-18 Revised:2023-12-25 Online:2024-02-01 Published:2024-02-29

摘要:

厄瓜多尔14和17区块位于奥连特盆地前渊带,主要含油层系为Napo组的M1,U和T段。现已开发油田进入高含水阶段,资源接替面临挑战。通过基于趋势面驱动的叠后地震数据连片一致性处理、时-频衰减高精度合成记录标定和解释及各向异性变速成图,精细刻画了低幅度构造,发现了一批低幅度构造油藏。采用分频迭代去噪拾取薄层弱反射系数,以其重构的叠后宽频有效信号为约束,采用相控波形非线性反演,定量预测了埋深3 000 m的2~5 m厚潮汐水道砂岩,发现了多个M1超薄层岩性油藏。依据区域水动力条件、低幅度构造油藏油-水界面趋势及油藏能量特征,发现了LU水动力油藏并滚动扩边。通过观察大量岩心薄片,发现海绿石在石英砂岩储层中呈胶结物和颗粒两种赋存状态,建立了海绿石双组构测井解释体积模型,评价并识别了UT低电阻率油藏。基于热带雨林地表和隐蔽油藏特点,按照“整体部署、分批实施、跟踪评价、及时调整”的策略,实现滚动勘探、评价和快速建产,探井和评价井成功率大于90 %。

关键词: 水动力成藏, 低幅度构造, 低电阻率油层, 勘探开发策略, 隐蔽油藏, 奥连特盆地, 厄瓜多尔

Abstract:

In blocks 14 and 17 of Ecuador, both situated in the foredeep zone of the Oriente Basin, the main oil-bearing strata comprise the M1, U, and T members of the Napo Formation. The developed oilfields in these blocks have entered a high water-cut stage, posing challenges to resource replacement. The trend surface-driven, post-stack consistent processing of seismic data, the time-frequency attenuation-based calibration and interpretation of high-precision synthetic seismograms, and anisotropic-variable-velocity mapping, are jointly applied to finely characterize low-amplitude structures, with many low-amplitude structural reservoirs discovered. Thin layers’ weak-reflection coefficients, determined through frequency-division iterative denoising, contribute to the reconstruction of effective post-stack broadband signals. With these signals as constraints, we quantitatively predict 2- to 5-m-thick tidal channel sandstones at a burial depth of 3 000 m through a seismic phase-controlled nonlinear inversion of waveforms, identifying several ultra-thin lithologic reservoirs in the M1 member. Based on regional hydrodynamic conditions, the oil-water contact trends of low-amplitude structural reservoirs, and the energy characteristics of reservoirs, we determine hydrodynamic oil reservoirs in the LU member and perform step-out drilling. The observation of numerous thin sections from cores reveals the presence of glauconites as cements and particles in the quartzose sandstone reservoirs. Accordingly, a dual-component volume model of glauconites for log interpretation is developed, allowing for reservoir evaluation and identification of low-resistivity reservoirs in the UT member. Based on the characteristics of tropical rainforest surfaces and subtle reservoirs in the subsurface, we achieve progressive exploration, evaluation, and rapid production onstream following the strategy of “overall deployment, batch-wise implementation, tracking and evaluation, and timely adjustment”, with a success rate of over 90 % for both exploration and appraisal wells.

Key words: hydrodynamic hydrocarbon accumulation, low-amplitude structure, low-resistivity oil layer, exploration and exploitation strategy, subtle reservoir, Oriente Basin, Ecuador

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