| 鄂尔多斯盆地长7段致密油成藏物性下限研究 |
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| 引用本文： | 吴康军,刘洛夫,徐正建,窦文超,罗安湘,付金华,谭先锋.鄂尔多斯盆地长7段致密油成藏物性下限研究[J].石油实验地质,2016,38(1):63-69. |
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| 作者姓名： | 吴康军 刘洛夫 徐正建 窦文超 罗安湘 付金华 谭先锋 |
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| 作者单位： | 1.中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249 |
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| 基金项目： | 国家自然科学基金项目"鄂尔多斯盆地三叠系延长组致密油含油边界识别研究"(41372143)、"济阳坳陷古近系孔店组旋回沉积机理及成岩系统研究"(41202043)和教育部高等学校博士学科点专项科研基金"致密油含油边界确定的新方法"(20130007110002)资助。 |
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| 摘 要： | 鄂尔多斯盆地延长组长7段致密砂岩储层在湖盆中心大面积分布,成藏期的储层物性下限是决定油气是否充注储层的重要参数。运用恒速压汞和纳米CT扫描技术分析了长7段湖盆中心渗透率小于0.3×10-3 μm2、孔隙度小于12%的致密砂岩储层的物性及微观孔喉特征。结果表明,其平均孔隙半径为160μm,喉道半径不超过0.55μm,均值为0.33μm。在分析致密油成藏期储源压差、原油物理性质及盆地流体特征的基础上,结合致密储层油气驱替模拟实验及最小流动孔喉半径法,综合确定了研究区长7段致密油成藏期油气开始充注时的孔喉下限为14 nm,孔隙度下限为4.2%,渗透率下限为0.02×10-3 μm2,要达到含油饱和度超过40%而实现致密油的大面积连续分布,孔喉半径下限应为0.12μm,孔隙度下限为7.3%,渗透率下限值为0.07×10-3μm2。
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| 关 键 词： | 物性下限 油气成藏 致密储层 致密油 延长组 鄂尔多斯盆地 |
| 收稿时间： | 2014-12-24 |
Lower limits of pore throat radius,porosity and permeability for tight oil accumulations in the Chang7 Member,Ordos Basin |
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| Affiliation: | 1.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China2. Basin and Reservoir Research Center, China University of Petroleum(Beijing), Beijing 102249, China3. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China4. Chongqing University of Science and Technology, Chongqing 401331, China |
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| Abstract: | Tight sandstone reservoirs were found widespread in the seventh member of Yanchang Formation (Chang7) in the central Ordos Basin. The lower limit of reservoir porosity and permeability during the accumulation period was critical for hydrocarbon enrichment. We studied these physical properties and microscopic pore throat characteristics of tight sandstones with permeability <0.3×10-3μm2 and porosity < 12% by means of constant-rate mercury injection and Nano-CT scan. The average pore radius is 160μm, and the throat radius is < 0.55μm, average 0.33μm. We analyzed the pressure differential between source rocks and reservoirs, the physical properties of crude oils, and fluid characteristics. Oil and gas displacement simulations in tight gas reservoirs and minimum flow pore throat radius method showed that the Chang7 tight reservoirs in the study area had a minimum pore throat radius of 14 nm, porosity of 4.2%, and permeability of 0.02×10-3 μm2 during hydrocarbon enrichment period. To form large tight oil reservoirs with an oil saturation > 40%, the lower limits for pore throat radius, porosity and permeability should be 0.12μm, 7.3% and 0.07×10-3μm2, respectively. |
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