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Qijiang shale gas field adds new geological reserve of 145.9 billion cubic meters

BEIJING, Nov. 25, 2022 /PRNewswire/ -- China Petroleum

The Qijiang shale gas field is the first shale gas field discovered in medium-deep and deep strata in a complex tectonic zone at the basin margin. Shale gas buried deeper than 3,500 meters is defined as deep shale, and the burial depth of Qijiang shale formations ranges from 1,900 to 4,500 meters, with most of them being deep shale. With the complex overlying strata, the project faced major challenges, including significantly greater depth and variable ground stress.

To address the question of how a shale gas reservoir was formed at the basin margin with such complex surface and underground conditions, the Sinopec team conducted more than 10,000 core laboratory analysis tests at the depth of 1,320 meters. meters. This revealed the mechanism of pore development and maintenance of deep shale and identified that deep shale can develop broad reservoirs with high porosity, and also revealed projection "sweet spots" of deep shale targets.

The team collected high-precision 3D seismic data from deep shale gas covering an area of ​​3,662 square kilometers in the complex zone of the southeastern margin of the Sichuan basin, as well as drilling data from existing wells in southern Sichuan. After repeated discussions and analysis, Sinopec has innovated a deep shale gas seismic prediction technology with pressure coefficient and gas content, fracture prediction and horizontal stress difference in the ground as the core, which is equivalent to perform a CT scan of the strata to achieve the breakthrough in predicting the "sweet spots" of deep shale gas.

Sinopec has also developed a three-dimensional fracturing technology with "precision cutting, pressurization and expansion, balanced expansion and guaranteed filling" for deep shale, which has improved daily shale gas production from a single well to over 300,000 marks. , 400,000 and 500,000 cubic meters successively.

For more information, visit Sinopec.

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