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鄂尔多斯盆地致密油储层启动压力梯度对比分析 被引量:3

Comparative study on threshold pressure gradient of tight oil reservoirs in Ordos Basin
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摘要 为探讨非常规致密砂岩油藏储层启动压力梯度问题,以鄂尔多斯盆地HQ、HS地区长6、长8储层为研究对象,开展启动压力实验,对比分析不同储层的启动压力梯度.研究表明,单相水状态水相、束缚水状态油相,均具有随渗透率降低,拟启动压力梯度、真实启动压力梯度升高的趋势.当渗透率低于0.3×10-3μm2,拟启动压力梯度、真实启动压力梯度均随渗透率降低而快速升高.饱和油束缚水状态油相拟启动压力梯度、真实启动压力梯度高于单相水状态水相的拟启动压力梯度、真实启动压力梯度.HQ地区水相、油相的拟启动压力梯度、真实启动压力梯度低于HS地区;长8储层水相、油相的拟启动压力梯度、真实启动压力梯度低于长6储层.研究区储层,水相、油相拟启动压力梯度、真实启动压力梯度由小到大的顺序为HQ地区长8储层、HS地区长8储层、HQ地区长6储层、HS地区长6储层.不同维度对比分析得出的启动压力梯度,对于鄂尔多斯盆地致密油开发具有指导意义,对于其他地区致密油的有效动用仍具有借鉴和示范意义. In order to study the threshold pressure gradient of Unconventional tight sandstone reservoirs, the threshold experiments were carried out in Chang 6 and Chang 8 reservoirs in HQ and HS areas of Ordos Basin, to compare and analyze the threshold pressure of different reservoirs. The results show that the water phase in single-phase water state and the oil phase in bound water state have the tendency of increasing pseudo-starting pressure gradient and real starting pressure gradient with the decrease of permeability. When the permeability is lower than 0.3×10-3μm2, both the pseudo-starting pressure gradient and the real starting pressure gradient increase rapidly with the decrease of permeability. The pseudo-starting pressure gradient and the real starting pressure gradient of oil phase in irreducible water state with saturated oil are higher than those of water phase in single-phase water state. The pseudo starting pressure gradient and the real starting pressure gradient of water and oil phase in HQ area are lower than those in HS area. The pseudo starting pressure gradient and the real starting pressure gradient of the water and oil phase of Chang 8 reservoir are lower than that of Chang 6 reservoir. In the reservoir of the study area, the order of water facies, oil facies pseudo-starting pressure gradient and real starting pressure gradient from small to large is Chang 8 reservoir in HQ area, Chang 8 reservoir in HS area, Chang 6 reservoir in HQ area and Chang 6 reservoir in HS area. Threshold pressure gradient obtained from the comparative analysis of different dimensions has guiding significance for the development of tight oil in Ordos Basin, and still has reference and demonstration significance for the effective production of tight oil in other areas.
作者 杨学峰 雷启鸿 王瑞飞 邵晓岩 廖海于 湛杰 王碧涛 周飞 YANG XueFeng;LEI QiHong;WANG RuiFei;SHAO XiaoYan;LIAO HaiYu;ZHAN Jie;WANG BiTao;ZHOU Fei(No.3 Oil Production Plant,PetroChina Changqing Oilfield Company,Yinchuan 750006,China;College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;Exploration Department of PetroChina Changqing Oilfield Company,Xi’an 710018,China)
出处 《地球物理学进展》 CSCD 北大核心 2021年第1期310-317,共8页 Progress in Geophysics
基金 陕西省教育厅重点项目“致密砂岩储层层理缝表征方法及渗流-应力时变耦合机理”(18JS084) 陕西省高校科协青年人才托举计划“基于地质数据库的复杂断块油田开发中后期精细地质建模方法研究”(20180703)联合资助。
关键词 致密油 非常规储层 启动压力梯度 鄂尔多斯盆地 延长组 Tight oil Unconventional reservoir Threshold pressure gradient Ordos Basin Yanchang formation
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