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海域天然气水合物水平井储层关键参数反演方法
张鑫1,黄芳飞2,谭玉阳3,梁前勇2,董一飞2,何川1
(1. 北京大学地球与空间科学学院,北京 100871;2.中国地质调查局广州海洋地质调查局,广东广州 510760;3.中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛 266100; )
摘要:
应用测斜仪监测技术进行海域天然气水合物水平井开采的产气量动态评价时,不同井段体积参数间的互补性可能导致目标函数陷入较大的收敛区域,此时反演方法所能达到的精度将直接影响反演结果。提出一种基于邻域算法的储层关键参数反演方法,以中国南海神狐海域实际地质情况为基础,利用合成的海底倾斜场数据对水平井不同井段的体积参数进行反演试算,并研究不同噪声程度和模型间距对反演结果的影响。结果表明:与直接网格搜索法相比,提出的方法在保证收敛效果的前提下计算效率更高,实时性更强;与模拟退火法相比,提出的方法反演精度更高;当不同井段的产水和出砂量较小或占该段储层变化体积的比例一致时,该方法可为海域天然气水合物水平井产气量的动态评价提供算法基础。
关键词:  天然气水合物  参数反演  倾斜场  邻域算法
DOI:10.3969/j.issn.1673-5005.2019.06.010
分类号::TE 53
文献标识码:A
基金项目:国家重点研发计划项目(2017YFC0307702,7YFC0307605);中国地质调查局国家天然气水合物专项(0733-19180292/21)
Inversion method of key reservoir parameters for horizontal well production of marine gas hydrate
ZHANG Xin1, HUANG Fangfei2, TAN Yuyang3, LIANG Qianyong2, DONG Yifei2, HE Chuan1
(1.School of Earth and Space Sciences, Peking University, Beijing 100871, China;2.Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China;3.MOE Key Laboratory of Submarine Geoscience and Prospecting Techniques, Ocean University of China, Qingtao 266100, China)
Abstract:
A tilt-meter monitoring method can be used to evaluate the dynamic gas output in horizontal wells during marine gas hydrate exploitation, while the objective function may fall into a large convergence area because of the complementarity between the volume parameters of different well sections. Thus, the accuracy of the inversion method will directly affect its results. In this work, a key reservoir parameter inversion method based on neighborhood algorithm was proposed, and a case study was carried out based on the geological conditions of Shenhu area in the South China Sea. The volume parameters of different sections of horizontal wells were inverted and calculated using the synthesized seabed tilt field data, and the influence of different noise levels and model spacing on the inversion results was studied. The results show that, compared with the direct grid search method, the proposed method has higher computational efficiency and better real-time performance on the premise of ensuring the convergence effect. Compared with the simulated annealing method, the proposed method also has higher inversion accuracy. When the output of water and sand form different well sections are small or the proportion of them to the changing volume of the reservoir is the same, this method can provide a better algorithm basis for the dynamic evaluation of marine gas hydrate production via horizontal wells.
Key words:  natural gas hydrates  parameters inversion  tilt field  neighborhood algorithm
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