深层探井海上油气测试情景

该井位于渤海中部海域，紧邻渤海最大富烃凹陷——渤中凹陷，所在构造为火山岩储层，钻探获得高产，其勘探前景广阔。

“从我国海洋油气勘探实践来说，通常把埋深超过4500米的地层称为超深层，我们部署的这口探井埋藏在海底超5000米的潜山，地层温度超过180摄氏度，压力超过70兆帕，是国内罕见的高温、高压超深层油气井，完成钻探并获得高产实属不易。”中海油天津分公司副总经理周家雄介绍说。

“海洋石油946”钻井平台进行钻探作业中

渤海海域火山岩潜山分布范围广，具有岩性变化快、储层非均质性强等特点，勘探难度极大，多年来一直未获突破，属于传统意义的勘探“禁区”。近年来，中国海油科研人员探索提出伸展-走滑复合断裂带深部油气勘探理论，不断创新岩性、岩相预测方法，自主研发潜山流体识别技术，成功预测渤海火山岩潜山优质储层发育区，探获高产油气井。此前，在该理论的指导下，相继发现了包括渤中26-6、渤中13-2在内的多个深层亿吨级油田。

钻井员工进行下套管作业

中国海油勘探副总师徐长贵表示，该井的成功钻探，开辟了海上超深层油气勘探新领域，有效印证了渤海隐性潜山的勘探潜力，同时伸展-走滑复合断裂带深部油气勘探理论技术的突破，进一步坚定了科研人员深耕深层-超深层的技术自信，对加快渤海深层-超深层勘探进程、建设海上万亿方大气区具有积极意义。

Deep exploration well offshore oil and gas test scenario

The well is located in the middle sea area of Bohai Sea, close to Bozhong Sag, the largest hydrocarbon rich sag in Bohai Sea. It is located in a volcanic rock reservoir. The drilling results in high yield and broad exploration prospect.

"From the perspective of China's offshore oil and gas exploration practice, the buried depth of more than 4,500 meters is usually referred to as ultra-deep layer. The exploration well we deployed is buried in the seabed of more than 5,000 meters buried hill, the formation temperature of more than 180 degrees Celsius, the pressure of more than 70 mpa, is a rare high-temperature and high-pressure ultra-deep oil and gas well in China, it is not easy to complete drilling and obtain high yield." Cnooc Tianjin branch deputy general manager Zhou Jiaxiong said.

The "Offshore oil 946" drilling platform is carrying out drilling operations

Volcanic buried hills in Bohai Sea are widely distributed and have the characteristics of rapid lithology change and strong reservoir heterogeneity, which is very difficult to explore and has not been broken through for many years, belonging to the traditional exploration "forbidden zone". In recent years, CNOOC scientific researchers have explored and proposed deep oil and gas exploration theories in extension-strike-slip composite fault zones, constantly innovated lithology and lithofacies prediction methods, independently developed buried hill fluid identification technology, successfully predicted high-quality reservoir development areas of volcanic buried hills in Bohai Sea, and explored high-yield oil and gas Wells. Previously, under the guidance of this theory, a number of deep 100-ton oil fields including Bozhong 26-6 and Bozhong 13-2 have been discovered successively.

Drillers run casing operations

Xu Changgui, deputy chief engineer of CNOOC Exploration, said that the successful drilling of the well opened up a new field of offshore ultra-deep oil and gas exploration, effectively confirmed the exploration potential of hidden buried hill in Bohai Sea, and at the same time, the breakthrough of deep oil and gas exploration theory and technology in the extension-strike-slip composite fault zone further strengthened the technical confidence of scientific researchers in deep and ultra-deep drilling. It is of positive significance for speeding up the deep-deep exploration process and constructing the trillion-square atmosphere in the Bohai Sea.