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.
