Cultivating Ideas, Exploring Innovation | The results of the Wide-Area Electromagnetic Method Project in Western Chongqing by the Geophysical Exploration Institute Have Been Recognized as Excellent.

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On November 5, the “Wide-Area Electromagnetic Survey Project for Well Areas Zu 201–Zu 203 in the Western Chongqing Block of the Sichuan Basin,” located in a complex and steeply structured geological area, successfully passed the expert panel’s acceptance inspection in Chongqing, and its results report was rated as excellent.

As oil and gas exploration efforts continue to deepen, complex, steeply dipping structural zones rich in hydrocarbon resources have become the current focus of oil and gas exploration. These structural zones feature intricate topography and highly variable subsurface geological conditions, making conventional exploration techniques difficult to apply and significantly increasing exploration challenges.

Upon receiving the exploration task, the Geophysical Exploration Institute immediately assembled seven key technical personnel who are Party members to establish the Yuxi Wide-Area Electromagnetic Survey Project Team. Adhering to the principle that “wherever the survey lines extend, there the Party flag shall fly,” the team promptly set up a temporary Party branch within the project team, thereby solidifying its role as a frontline fighting stronghold. Members of the project team have intensified their learning and skill development, meticulously refined their application of methodologies, actively engaged in critical thinking, and boldly embraced innovation. They have launched pilot tests aimed at tackling the challenges posed by complex, steeply inclined geological structures in wide-area electromagnetic surveys, striving to overcome bottlenecks in oil and gas exploration in such areas. In doing so, they are contributing to the construction of the “Gas Daqing” in the Sichuan Basin and helping to ensure national energy security.

In March of this year, the project team conducted a “double-blind” trial攻关 based on the “Wide-Area Electromagnetic Survey of Blocks Zu 201–Zu 203 in the Western Chongqing Area of the Sichuan Basin” project. Through extensive trial and攻关 efforts, they determined optimal acquisition parameters from multiple aspects—including transmitter-receiver spacing, station spacing, and frequency—to ensure high-quality raw data acquisition.

In April, the temporary Party branch of the project team held a Party Day activity themed “Stimulating New-Style Productivity and Stepping into a New Stage of High-Quality Development.” During the event, participants studied General Secretary Xi’s important remarks on new-style productivity and discussed practical approaches for fostering such productivity. Also in April, field data collection work was carried out, and the data acquisition and raw data quality analysis processes were successfully completed. Later, the wide-area team, operating without seismic constraints, employed the domestically developed “Wide-Area Fine Inversion System” and innovatively introduced advanced techniques—including “electromagnetic phase high-resolution layer calibration technology” and “effective extraction technology for weak electromagnetic signals”—to process and interpret the data. As a result, they successfully revealed the fault and stratigraphic distribution characteristics in the complex, steeply dipping structural zones.

At the results acceptance review meeting, chief experts from PetroChina Southwest Oil & Gas Field, along with several renowned experts from the Southwest Oil & Gas Field Development Management Department and the Shale Gas Research Institute, jointly participated in the review. After carefully listening to the report on the project’s achievements, the experts stated that this wide-area攻关 project had been “successfully completed.” The results accurately reflect the main structural features of complex, steeply dipping structural zones and exhibit strong comparability with three-dimensional seismic data. Moreover, these results demonstrate superior performance in complex, steeply dipping structural zones characterized by poor seismic data quality. The findings hold high exploration potential in complex structural areas and offer broad application prospects for exploration in conventional oil and gas fields located in complex geological settings.

The experts’ recognition of the wide-area achievements has greatly boosted the confidence of all members of the geophysical exploration institute’s wide-area electromagnetic method technology team. Moving forward, they will continue to take Party building as their guiding principle, remain true to their original aspirations, and proactively strive for excellence. They will focus on complex structural zones, deep-layer oil and gas exploration, and low-resistivity shale gas exploration, tackling the industry’s most pressing challenges and continuously overcoming technical hurdles. In this way, they will ensure that the Party flag flies high at the forefront of exploration, putting their commitment to the mission and responsibilities of state-owned enterprises into practice through concrete actions.

Executive Producer | Yu Changheng
Reviewed by | Zou Zhongping
Editor-in-charge | Zhou Huiying
Text | Tian Tengzhen
Figure | Project Department
Editor | Wen Han