火山岩定容充注物理模拟实验研究——以松辽盆地徐家围子断陷营城组火山岩为例

Physical simulation of volumetric charging of volcanic rock: case study of volcanic rock in Yingcheng Formation of Xujiaweizi Fault Depression in Songliao Basin

张学娟 荣鹏飞 卢双舫 张曦 郭天然 王民

ZHANG Xuejuan RONG Pengfei LU Shuangfang ZHANG Xi GUO Tianran WANG Min

1. 东北石油大学 地球科学学院, 黑龙江 大庆 163318; 2. 东北石油大学 非常规油气成藏与开发省部共建国家重点实验室, 黑龙江 大庆 163318; 3. 中国石油大学(华东) 非常规油气与新能源研究院, 山东 青岛 266580; 4. 西南油气田分公司 工程技术研究院, 成都 610017; 5. 吉林油田分公司 油气工程研究院, 吉林 松原 138000

1. College of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; 2. Accumulation and Development of Unconventional Oil and Gas, State Key Laboratory Cultivation Base Jointly-constructed by Heilongjiang Province and the Ministry of Science and Technology, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; 3. Research Institute of Unconventional Oil & Gas and Renewable Energy, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 4. Engineering Technology Research Institute of Southwest Oil and Gas Field Branch Company, Chengdu, Sichuan 610017, China; 5. Petroleum Production Technology Research Institute of Jilin Oilfield Company, Songyuan, Jilin 138000, China

以松辽盆地徐家围子断陷营城组火山岩全直径取心岩样为实验介质，设计制作耐压可视的实验装置，选择一定的初始充注压力开展定容衰竭气体充注实验。实验结果表明：裂缝型介质需要一定的开启压力及开启时间才具备高效输导能力，而裂缝一旦开启后，即使充注压力低于开启压力，裂缝依然具有输导能力，直到充注压差降为零；孔渗型非均质岩样中，中孔、中渗岩心气体运移路径可表现为明显指状突进式特征，而高孔、高渗型火山岩介质可以明显观察到充注过程中各孔渗单元有规律的幕式周期运移过程。整体上，定容充注压力与衰减时间具有指数关系的衰减特征，气体运移速度随时间具有波浪式起伏降低的幕式特征，且随着充注压力的不断降低，幕式运移路径范围逐渐减小。

Full-diameter volcanic rock core samples of the Yingcheng Formation in the Xujiaweizi Fault Depression of the Songliao Basin were used in a transparent experimental device with pressure resistance. An initial filling pressure was selected to carry out a constant volume exhaust gas filling experiment. Experimental results showed that the crack-type medium needs a certain opening pressure and opening time to have high-efficiency transport ability, and once the crack is opened, even if the charging pressure is lower than the opening pressure, it still has the ability to transport until the charging pressure difference drops to zero. Among the porosity-permeability-type heterogeneous rock samples, gas migration path can be expressed as a finger plunging feature in medium porosity and permeability core. However, in the high porosity and permeability volcanic rock medium, a regular curtain-type periodic migration process of each pore-permeating unit during the filling process was observed. Overall, the constant volume filling pressure and decay time has an attenuation feature with an exponential relationship, and with the attenuation of filling pressure, natural gas migration speed is accompanied by the curtain characteristics of wave fluctuation. As the filling pressure continuously reduces, the range of curtain transport paths gradually reduces.

国家自然科学基金面上项目“白云岩对陆相湖盆泥页岩层系储层物性和脆性的影响定量研究”（41672113）和东北石油大学培育基金项目“酸性火山岩风化特征研究”（XN2014118）资助。

https://doi.org/10.11781/sysydz201806864