非常规/复杂油藏

新一代地层测试推进火山角砾岩地层的评价

本研究将近期开发的地层测试与先进的岩石物理测井相结合，以解决传统方法在火山角砾岩地层中的局限性。

图 1——GFT 入口模块：双封隔器（约 1.82×15 米密封长度），并图示低密度和高密度流体分离。
图 1——GFT 入口模块：双封隔器（约 1.82×15 米密封长度），并图示低密度和高密度流体分离。
来源：SPE 229928。

准噶尔盆地的佳木河组由火山角砾岩储层组成，其流体类型岩石物理性质难以确定。传统方法将含油层误判为游离水，而钻柱测试（DST）数据则将气顶信号误判为溶解气，从而掩盖了油气界面（GOC）。本研究将新一代地层测试（NGFT）技术与先进的岩石物理测井技术相结合，以克服上述局限性。

NGFT技术

本文所述的电缆测井地层测试仪 (WFT) 集成了新型硬件架构和数字化自动化技术。其核心创新在于模块化平台，该平台以高效聚焦径向探头为中心，在单个封隔器组件内设有径向排列的保护入口 (44 in.² ) 和取样入口 (64 in.² )，从而提供 110 in.² 的总流通面积，适用于超低渗透率地层（渗透率小于 0.01 md/cp）。另一项核心设计是双流线双封隔器系统，该系统可根据储层评价要求灵活地应用于 1.82 × 15 m 的地层。其双流线配置最大限度地提高了井筒流体的重力分离，从而能够通过上部流线入口快速检测地层烃类迹象（图 1）。

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原文链接/JPT
Unconventional/complex reservoirs

New-Generation Formation Testing Advances Evaluation of Volcanic Breccia Formations

This study integrates recently developed formation testing with advanced petrophysical logging to address limitations of traditional methods in volcanic breccia formations.

Fig. 1—NGFT inlet module: Dual packer (approximately 1.82–15-m sealing length) with illustration of low- and high-density fluid segregation.
Fig. 1—NGFT inlet module: Dual packer (approximately 1.82–15-m sealing length) with illustration of low- and high-density fluid segregation.
Source: SPE 229928.

The Jiamuhe Formation in the Junggar Basin consists of volcanic breccia reservoirs that make fluid typing petrophysically challenging. Traditional methods suggested oil-bearing zones with free water, while drillstring-test (DST) data misinterpreted gas-cap signals as dissolved gas, obscuring gas/oil contacts (GOC). This study integrates new-generation formation-testing (NGFT) technology with advanced petrophysical logging to address these limitations.

NGFT Technology

The described wireline formation tester (WFT) integrates novel hardware architecture and digital automation. The core innovation is a modular platform centered on a high-efficiency focused radial probe featuring radially arranged guard inlets (44 in.2) and sample inlets (64 in.2) within a single packer assembly, delivering a 110-in.2 total flow area for ultralow-permeability access (less than 0.01 md/cp). Another core design is a dual-flowline dual-packer system, which can be set flexibly across 1.82–15-m formations based on reservoir-evaluation requirements. Its dual-flowline configuration maximizes gravitational segregation of wellbore fluids, enabling expedited detection of formation hydrocarbon indications through the upper flowline inlet (Fig.

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