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天然气/水/岩石系统中相互作用对油气运移与聚集的影响。

Effects of interactions in natural gas/water/rock system on hydrocarbon migration and accumulation.

作者信息

Jiang Lin, Zhao Wen, Huang Jianguo, Fan Yang, Hao Jiaqing

机构信息

Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, People's Republic of China.

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, People's Republic of China.

出版信息

Sci Rep. 2021 Nov 11;11(1):22070. doi: 10.1038/s41598-021-01653-0.

DOI:10.1038/s41598-021-01653-0
PMID:34764388
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8586332/
Abstract

The study of natural gas accumulation process in tight formation has become the focus of the petroleum industry. One of the priorities is the effects of interactions in natural gas/water/rock system on hydrocarbon migration and accumulation process. On the macroscopic scale, we investigate the interactions in natural gas/water/rock system by formation fluorescence test and production data analysis. One the microscopic scale, the mechanisms are revealed by mathematical analysis and experimental methods considering the variation of geological temperature and pressure. The effects of interactions in natural gas/water/rock system are also simulated by numerical simulation. The results are visualized and quantified. A novel semi-analytical method based on a physical experiment is proposed to calculate the temperature- and pressure-dependent contact angle and interface tension which reflect the interactions in the natural gas-water-rock system. This semi-analytical is embedded in the numerical simulation during the simulation of the natural gas charging process. The results indicate that with the increase of geological temperature and pressure, the contact angle will increase and the interface tension between natural gas and water will decrease. The capillary resistance in the formation will be reduced. Since the decrease of capillary resistance, the natural gas can be charged into smaller pores, so that the actual charging threshold is lower than the one originally obtained under present reservoir conditions. After considering the temperature and pressure during the accumulation process, some sand bodies that were thought not to be charged may have natural gas accumulate.

摘要

致密地层天然气成藏过程研究已成为石油工业的焦点。其中一个重点是天然气/水/岩石系统中的相互作用对油气运聚过程的影响。在宏观尺度上，我们通过地层荧光测试和生产数据分析来研究天然气/水/岩石系统中的相互作用。在微观尺度上，通过考虑地质温度和压力变化的数学分析和实验方法揭示其机理。天然气/水/岩石系统中相互作用的影响也通过数值模拟进行模拟，并将结果可视化和量化。提出了一种基于物理实验的新型半解析方法来计算反映天然气-水-岩石系统中相互作用的温度和压力依赖的接触角和界面张力。这种半解析方法在天然气充注过程模拟中嵌入到数值模拟中。结果表明，随着地质温度和压力的升高，接触角增大，天然气与水之间的界面张力减小，地层中的毛管阻力降低。由于毛管阻力的降低，天然气能够充注到更小的孔隙中，使得实际的充注门槛低于当前储层条件下最初得到的充注门槛。考虑成藏过程中的温度和压力后，一些原本认为不会充注天然气的砂体可能会有天然气聚集。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/e66fd2b3ad99/41598_2021_1653_Fig13_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/e1ccdcc36abc/41598_2021_1653_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/14c51a05af30/41598_2021_1653_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/1483b0220fa1/41598_2021_1653_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/36c822522bb2/41598_2021_1653_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/347aff7cd78d/41598_2021_1653_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/927590c54339/41598_2021_1653_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/1b87c17da346/41598_2021_1653_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/fa9324291a42/41598_2021_1653_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/ca2a3bfea06c/41598_2021_1653_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/8036ded5e256/41598_2021_1653_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/09c6df4c820f/41598_2021_1653_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7002/8586332/e66fd2b3ad99/41598_2021_1653_Fig13_HTML.jpg

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