Seafloor Deformation Monitoring Based on Tiltmeters for Natural Gas Hydrate Production

doi:10.13209/j.0479-8023.2019.054

Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2019, Vol. 55 ›› Issue (4): 635-642.DOI: 10.13209/j.0479-8023.2019.054

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Seafloor Deformation Monitoring Based on Tiltmeters for Natural Gas Hydrate Production

ZHANG Xin¹, ZHANG Hongliang², ZHOU Lei³, HE Tao⁴, LIANG Qianyong⁵, DONG Yifei⁵, HE Chuan^1,†

1. Institute of Oil and Gas, School of Earth and Space Sciences, Peking University, Beijing 100871 2. School of Geoscience, University of Calgary, Calgary T2N1N4 3. Offshore Oil Engineering Co. LTD, Tianjin 300451 4. Laboratory of Orogenic Belts and Crustal Evolution (MOE), Peking University, Beijing 100871 5. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760

Received:2018-10-11 Revised:2018-12-18 Online:2019-07-20 Published:2019-07-20
Contact: HE Chuan, E-mail: chuanhe_pku(at)163.com

基于测斜仪的天然气水合物开采海底变形监测

张鑫¹, 张洪亮², 周雷³, 何涛⁴, 梁前勇⁵, 董一飞⁵, 何川^1,†

1. 北京大学石油与天然气研究中心, 北京大学地球与空间科学学院, 北京 100871 2. School of Geoscience, University of Calgary, Calgary T2N1N4 3. 海洋石油工程股份有限公司, 天津 300451 4. 造山带与地壳演化教育部重点实验室, 北京 100871 5. 中国地质调查局广州海洋地质调查局, 广州 510760

通讯作者: 何川, E-mail: chuanhe_pku(at)163.com
基金资助:
国家重点研发计划项目(2017YFC0307605, 2017YFC0307702)、海洋石油工程股份有限公司“海洋平台多系统集群监测与评估技术的研究及应用”课题(Z17SJENI0053)、国家自然科学基金(41676032)和中国地质调查局国家天然气水合物专项(DD20160217)资助

Abstract

Abstract:

We present and establish a seafloor deformation model for gas hydrate exploitation in the sea area based on Okada’s linear elasticity theory. The seafloor deformation field is simulated by using high precision tiltmeters, and the model parameters are inverted by simulated annealing method. The results show that the accurate information of dip, azimuth and volume of hydrate dissociated zone can be obtained by tiltmeters. The test results at different noise levels show that the model parameter inversion method has good anti-noise performance. In addition, the feasibility of tiltmeter monitoring in practical application is analyzed according to the hydrate exploitation test in Shenhu area of South China Sea in 2017, and the results show that the type of decline in production has advantages in seabed stability.

Key words: natural gas hydrate, seafloor deformation monitoring, tiltmeter, tilt field, simulated annealing

摘要：

根据Okada线弹性理论, 提出并建立海域天然气水合物开采的海底变形场模型, 对开采产生的海底变形场进行正演模拟, 并采用模拟退火方法, 对合成观测数据进行模型参数反演。结果表明, 利用测斜仪监测能够得到水合物开采区域准确的倾角、方位角和体积等信息。不同噪声水平下的测试结果表明, 所采用的模型参数反演方法具有良好的抗噪性。另外, 结合2017年中国南海神狐海域水合物开采试验, 分析测斜仪监测在实际应用中的可行性, 表明“产能递减型”开采方案在海底稳定性方面具有一定的优势。

关键词: 天然气水合物, 海底变形监测, 测斜仪, 倾斜场, 模拟退火

ZHANG Xin, ZHANG Hongliang, ZHOU Lei, HE Tao, LIANG Qianyong, DONG Yifei, HE Chuan. Seafloor Deformation Monitoring Based on Tiltmeters for Natural Gas Hydrate Production[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2019, 55(4): 635-642.

张鑫, 张洪亮, 周雷, 何涛, 梁前勇, 董一飞, 何川. 基于测斜仪的天然气水合物开采海底变形监测[J]. 北京大学学报自然科学版, 2019, 55(4): 635-642.

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Seafloor Deformation Monitoring Based on Tiltmeters for Natural Gas Hydrate Production

基于测斜仪的天然气水合物开采海底变形监测

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