深水中大型气田滚动勘探技术体系与成效——以琼东南盆地中央峡谷A边际气田为例

Technical system and achievements of rolling exploration in large and medium-sized deep-water gas fields: a case study of marginal gas field A in central canyon of Qiongdongnan Basin

陈奎 胡德胜 宋瑞有 龚宇 肖大志 黄安敏 朱玉双

CHEN Kui HU Desheng SONG Ruiyou GONG Yu XIAO Dazhi HUANG Anmin ZHU Yushuang

1. 西北大学 地质学系/大陆动力学国家重点实验室, 西安 710069; 2. 中海石油(中国)有限公司 湛江分公司, 广东 湛江 524057; 3. 中海石油(中国)有限公司 海南分公司, 海口 570300

1. Department of Geology, Northwest University/State Key Laboratory of Continental Dynamics, Xi'an, Shaanxi 710069, China; 2. Zhanjiang Branch of CNOOC Ltd., Zhanjiang, Guangdong 524057, China; 3. Hainan Branch of CNOOC Ltd., Haikou, Hainan 570300, China

为了促进琼东南盆地中央峡谷深水A边际气田开发，引入目标搜索研究、目标评价研究、目标钻探研究等完整气田滚动勘探技术体系。A边际气田目标搜索除利用传统的区带油气潜力目标搜索技术外，提出评价过程目标搜索技术，共搜索了5个油气潜力区块，并优选A4构造进行油气目标评价。从圈闭解释与落实、圈闭烃类检测两方面对A4构造油气成藏主控因素开展研究。A4构造中部预测优势含气区具有强振幅属性、低密度、低速度、低纵波阻抗、低纵横波速度比等有利含气信息特征，总体为Ⅲ类AVO异常，且能够升级HL_0气组控制天然气地质储量，部署滚动探井A4-1井实施钻探，在黄流组钻遇气层超20 m，莺歌海组二段钻遇可疑气层近10 m，获得天然气探明地质储量近30亿立方米，钻探效果好。滚动勘探研究在深水A边际气田的应用，不仅有效地促进了A边际气田后续滚动勘探活动，而且证实了滚动勘探同样适用于深水油气勘探。

A complete technical system of gas field rolling exploration such as target search, evaluation and drilling was introduced to promote the development of the deep-water marginal gas field A in the central canyon of the Qiongdongnan Basin. In addition to the traditional target search technology of oil and gas potential in the zone, a target search technology of evaluation process was proposed for the marginal gas field A. A total of five potential oil and gas blocks were searched, and the structure A4 was selected for oil and gas target evaluation. The main controlling factors of hydrocarbon accumulation in the structure A4 were studied from two aspects: trap interpretation and implementation, and trap hydrocarbon detection. The predicted dominant gas-bearing areas in the central part of structure A4 have favorable gas-bearing information characteristics such as strong amplitude attributes, low density, low velocity, low P-wave impedance, and low P-wave and S-wave velocity ratios. They were generally classified as class Ⅲ AVO anomaly, which can upgrade the HL_0 gas group to control natural gas geological reserves. The rolling exploration well A4-1 was drilled, encountering a gas layer of over 20 m in the Huangliu Formation, and a suspicious gas layer of nearly 10 m in the second member of Yinggehai Formation. The proven geological reserves of natural gas were nearly 3 billion cubic meters, and the drilling effect was good. The application of rolling exploration research in the deep-water marginal gas field A not only effectively promotes the subsequent rolling exploration activities of the marginal gas field A, but also confirms that rolling exploration is also applicable to deep-water oil and gas exploration.

中国海洋石油有限公司科技项目“南海深水盆地油气运聚成藏分析与突破方向”(KJGG2022-0103)资助。

https://doi.org/10.11781/sysydz202401001