Physical Simulation about Sandbody Physical Property Control on Forming Lithological Reservoirs
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摘要: 以东营凹陷岩性油藏为例, 从地质剖析、物理模拟实验和成藏机理等方面探讨了砂体物性变化对岩性油藏含油饱和度增长的控制作用.东营凹陷下第三系被有效源岩包裹砂体的含油性好于处于源岩之外的砂体的含油性, 而且被源岩包裹砂体的含油饱和度具有随砂体物性变好而增加的趋势.在对东营凹陷岩性油藏剖析的基础之上, 应用岩性油藏成藏模拟实验装置, 开展了不同砂体物性对岩性砂体成藏控制的物理模拟实验.模拟实验表明: 在相同压力条件下, 随着砂体粒度的增加, 砂体电阻率变化相同量所需的时间逐渐变短, 即砂体中的含油饱和度达到一定值的速度逐渐变快.这说明砂体物性越好, 越有利于砂体油藏的形成, 砂体物性是影响油气成藏的重要因素.Abstract: Taking the lithological reservoir of Dongying sag as an example, this paper discusses how the change of physical property of sandbody controls the increase of oil saturation from geological analysis, physical simulation experiment and reservoir-formation mechanism. The petroliferous property of the sandbody enveloped by effective source rock Lower Tertiary is superior to that of the sandbody that lies outside the source rock. And the oil saturation of sandbody enveloped by source rock is inclined to increase when the physical property of sandbody becomes better. Based on the analysis on the lithological reservoir of Dongying sag, physical simulation experiments on controlling the forming of lithological sandbody were conducted with hydrocarbon migration and accumulation simulation facilities. The results show that the resistivity of sandbody changes quickly with the increase of grain size, in other words, the speed of the sandbody's reaching a certain oil saturation becomes faster, which indicates that a better physical property of sandbody is conductive to forming lithological reservoir since the physical property is one of the important factors influencing the reservoir forming of sandbody.
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图 1 东营凹陷岩性油藏充满度与砂体物性的关系
Fig. 1. Relationship between the oil-charged degree and physical property of sandbody of lithological reservoir in Dongying sag
图 2 三维实验装置流程
Fig. 2. Flow schematic chart of three-dimensional experimenting facilities
图 3 实验模型剖面图及测试电极分布
Fig. 3. Experiment model profile and its electric poles distribution
图 4 电极电阻、压力、砂体含油饱和度随时间变化关系
Fig. 4. Relations between electrode resistivity, pressure, oil saturation with time
表 1 粘土测定实验条件
Table 1. Clay determination experimental condition
表 2 岩性油藏成藏机理物理模拟实验项目
Table 2. Physical simulation experiment item of lithological oil reservoir formation mechanism
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