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Targeting deep formations and uncovering hidden resources: The wide-area electromagnetic method boosts shale gas exploration.
On behalf of Sichuan Changning Natural Gas Development Co., Ltd., the Institute of Geophysical Exploration has been commissioned to conduct wide-area electromagnetic deep-probing and blind-zone exploration in the Daba Sweet Spot of the Changning Block. The exploration aims to characterize the variations in wide-area apparent resistivity of the target strata, providing technical support data for the subsequent drilling and exploration of shale gas platforms.
From June 17 to June 18, 2022, the Geophysical Exploration Institute organized more than ten geology, geophysics, and development professionals from within the institute to conduct on-site surveys and targeted investigations of key areas for the dam’s wide-area electromagnetic exploration project.
The expert panel visited the high-production well platform, which has been under development for nearly two years, to gain insight into the trends in development data.
Subsequently, the expert team conducted well logging data analysis at the well where the drilling platform was under construction.
Go to the drilling platform to analyze the conditions of the target formation.
After gaining an understanding of the basic information regarding drilling, development, and well completion, the expert panel listened to a briefing on the production plan for this site provided by the geophysical exploration project.
In recent years, the geophysical exploration institute has carried out wide-area electromagnetic (WAE) projects in fields such as highways, railways, and oil and gas, with a total working length approaching 2,000 km, yielding promising results. The theoretical framework and patented inventions of Academician Ji Shanshan’s wide-area electromagnetic method have provided crucial production validation. In the current shale gas development and production area around the Changning Dam block, new challenges have emerged—how to explore deeper and locate previously hidden reservoirs. Members of the expert panel actively engaged in discussions, leveraging the fine-resolution characteristics of the wide-area electromagnetic method. They made full use of the region’s distinctive wide-area apparent resistivity signatures, meticulously refining the “two high, one low” stratigraphic features of the target formation and its surrounding strata. By analyzing existing achievements and identifying shortcomings in previous interpretations, and by effectively applying the latest software developments, they conducted an in-depth study of the raw data, rigorously distinguishing between true and spurious signals. This approach has enabled them to enhance the accuracy and practical relevance of the project’s outcomes, providing robust technical support for the exploration and development of shale gas in the Changning area.
Executive Producer | Zhang Guangda
Reviewed by | Zou Zhongping
Editor-in-charge | Zhou Huiying
Text | Yin Xuebo
Figure | Zhao Yi
Editor | Wen Han
Address: No. 39 Qinghua Road, Qingyang District, Chengdu City, Sichuan Province
Email: sczywty@163.com
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