中海油在珠江口盆地超深水荔湾4-1构造成功天然气井，测试日产天然气43万立方米，标志着我国海上超深水碳酸盐岩油气勘探首次取得重大突破。

该井位于珠江口盆地最大的富烃凹陷白云凹陷，距深圳东南约300公里，水深近1640米。该井垂深近3000米，完井深度近4400米，水平段钻遇气层约650米，揭示了我国超深水球藻灰岩良好的勘探前景，有力推动了白云凹陷天然气勘探进程。

该公司首席地质师徐长贵表示：“此前，中国超深水勘探主要集中在碎屑岩上。该井的成功首次揭示了中国超深水碳酸盐岩的巨大潜力，标志着勘探认识和作业技术都取得了重大突破。此外，该发现靠近荔湾3-1气田现有的生产设施，可以利用这些设施开发新发现。”

CNOOC has drilled a natural gas well in the ultra-deepwater Liwan 4-1 structure in the Pearl River Mouth Basin. The well was tested to produce 430,000 cu m per day of absolute open flow natural gas, marking the first major exploration breakthrough in ultra-deepwater carbonate rocks offshore China.

The well is located in Baiyun Sag, the largest hydrocarbon-rich sag in the Pearl River Mouth Basin, about 300 km southeast of Shenzhen with a water depth of nearly 1,640 m. The well was drilled to a vertical depth of nearly 3,000 m, completed at a depth of nearly 4,400 m, and encountered gas pay zone of approximately 650 m in the horizontal section. The well has revealed promising exploration prospects in the ultra-deepwater Globigerinid limestone in China, and effectively promotes the natural gas exploration process in Baiyun Sag.

Xu Changgui, Chief Geologist of the company, said, “Previously, exploration in China’s ultra-deepwater areas mainly focused on clastic rocks. The success of this well has, for the first time, revealed the enormous potential of carbonate rocks in China’s ultra-deep waters, marking significant breakthroughs in both exploration understanding and operational techniques. In addition, this discovery is close to the existing production facilities of Liwan3-1 gas field, which could be utilized to develop the new discovery.”