| 摘要: |
| 利用超高压流体相态分析系统测定不同温度、压力条件下天然气中凝析水的含量,利用半渗透隔板实验测定不同物性储层样品的最大含气饱和度,结合实际地质资料,分析莺歌海盆地DF区高温高压带气藏中水的来源、气藏较高含水饱和度及较低含气饱和度的原因。结果表明:甲烷气相中凝析水的含量随温度的增高而增加,随压力的增高反而降低,实验最高温度、最高压力条件下(180 ℃、130 MPa)甲烷气中凝析水的摩尔分数仅占整个气相体系的1.51％,说明高温高压条件下气藏中凝析水含量并不高,高温高压带气藏产出的水主要是孔隙水,凝析水不是主要的;储层含气饱和度主要与储层物性和是否发育隔层有关,储层物性变差,其最大含气饱和度迅速降低,非(或差)渗透性隔层的存在也会使气藏纯气段含气饱和度降低。莺歌海盆地DF区高温高压带天然气藏较高含水及较低含气饱和度的主要原因是低渗储层和隔层发育,而不是高的凝析水含量。 |
| 关键词: 凝析水 含气饱和度 低渗储层 高温高压 莺歌海盆地 |
| DOI：10.3969/j.issn.1673-5005.2015.05.006 |
| 分类号::TE 122.1 |
| 基金项目:“十二五”国家重大专项(2011ZX05023-004-008) |
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| Cause analysis of natural gas with high water saturation and low gas saturation in high-temperature and high-pressure zone of DF area in Yinggehai Basin |
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MA Jian1, HUANG Zhilong1, LI Xushen2, PEI Jianxiang2, WU Hongzhu1, ZHU Jiancheng2
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(1.State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum, Beijing 102249, China;2. Zhanjiang Branch of CNOOC Limited, Zhanjiang 524057, China)
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| Abstract: |
| The water content in the coexisting gas phase was measured under high temperature and high pressure, using an ultra-high pressure fluid PVT system. Using the micropore membrane technique, the maximum gas saturation of samples with different physical properties was measured. Based on the experimental results, and combined with the study of the actual geological data, the source of water and the cause of gas reservoirs with high water saturation and low gas saturation are analyzed in the high-temperature and high-pressure zone of DF area, Yinggehai Basin. The results show that there is a positive correlation between water content in the coexisting gas phase and temperature, and a negative correlation between water content and pressure. The water content is not very high at the highest temperature of 180 ℃ and the highest pressure of 130 MPa in this experiment, with its mole fraction only accounting for 1.51% of the whole gas phase system. The condensate water content in the gas reservoir is not very high at high temperature and pressure. The output water of gas reservoirs is mainly from pore water in the layers, and the condensate water is not the main source. The gas saturation of gas reservoirs are mainly controlled by the physical property of the reservoir and the impermeable interlayers. When the physical property becomes poor, its maximum gas saturation will reduce rapidly. In addition, impermeable or poor permeable interlayers will also lead to the reduction of the gas saturation in the gas reservoir. Therefore, low permeability reservoirs and the occurrence of interlayers should be the main causes of gas reservoirs with high water saturation and low gas saturation in the high-temperature and high-pressure zone of DF area, Yinggehai Basin, rather than the high condensate water content. |
| Key words: condensate water gas saturation low permeability reservoir high temperature and high pressure Yinggehai Basin |
