2002•中国科学通报：英文版Requires access
Deep overpressure gas accumulation
Qiming, Zhang
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Abstract
The Kela-2 gas field in the Kuqa Depression ofthe Tarim Basin is one of the greatest fields recently discov-ered in the deep overpressure reservoir in the world. Theplay conditions of Kela-2 field and Ya21-l structure featuresin the Qiongdongnan Basin on the South China Sea shelf hasbeen studied, and a gas accumulation under deep overpres-sure must have the following two conditions (besides otherfavourable conditions for gas accumulation): one is that thetime of gas charge matches with overpressure occurrencetime, and the other is a good quality caprock. If the chargewas early and the overpressure occurrence was late, and afine caprock of the evaporite bed existed, the accumulationof gas is favourable; conversely, it is difficult to form a gasreservoir.