In a significant development, the Qinghai Oilfield of PetroChina has made remarkable progress in the exploration of tight oil (shale oil) in the Zhaha Springs area. As of now, Zha 9 well has produced a total of 125 cubic meters of crude oil, marking an important milestone in the region's energy development. In February this year, the National 973 Program titled “Formation Mechanism and Enrichment Regularity of China’s Terrestrial Tight Oil (Shale Oil)†was officially launched. The Zhaha Springs area in Qinghai Oilfield has been designated as a key test site for this initiative, with the first 100 million tons of tight oil reserves being identified as early as 2013.
Zha 9 well is located in the Zhahaquan area within the western Qaidam Basin, and it serves as a critical exploration well for the Qinghai Oilfield. According to Zou Cai, the chief scientist of the 973 Program on the Formation Mechanism and Enrichment of Terrestrial Tight Oil (Shale Oil) and Associate Dean at the China Petroleum Exploration Institute, the U.S. has led the way in marine shale gas exploration. However, China is now poised to become a global leader in continental shale oil. This project will focus on five major basins, including Ordos and Junggar, to conduct fundamental research aimed at understanding and developing China’s terrestrial tight oil resources.
The study will address three key areas: resource potential assessment, favorable area prediction, and reserve size estimation. By developing preliminary geological theories and evaluation methods, the project aims to accelerate the breakthroughs in tight oil and shale oil exploration. It also seeks to enhance regulatory frameworks and technological innovation, which are crucial for the sustainable growth of the industry.
Drilled to a depth of 3,650 meters in October 2013, Zha 9 well showed active oil and gas indications during drilling. A total of 95 meters across 27 layers were identified with gas detection anomalies. Specifically, in the N1 section, a 56.4-meter oil layer was found in 19 layers, along with 23.4 meters of potential oil-bearing layers in six sections. On February 28, the well was perforated in the N1 formation I sand layer, and it began producing oil through a 4 mm nozzle, yielding 26.13 cubic meters per day. This success has expanded the tight oil exploration area of Zhaha Springs, extending the oil-bearing zone both laterally and vertically.
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