Characteristic and Dynamics Mechanism of Low Potential Controlling on Hydrocarbon Accumulation
-
摘要: 含油气盆地油气藏的形成和分布受低势场控制.济阳坳陷已发现的油气藏分布特征表明: 在势场作用下, 油气只能进入到孔隙度超过某一临界值或内部势能低于周边势能2倍到100倍以上的储层内聚集成藏; 随着埋深加大和储层孔隙度变小, 圈闭聚集油气成藏的临界条件呈规律性变化, 即埋深较大的圈闭成藏时要求的相对势能较浅部储层的势差更大.动力学分析和物理模拟实验研究表明, 地表条件下储层聚集油气的前提条件是其孔喉半径大于周边围岩的两倍以上; 地下储层聚集油气的前提是它与周围介质间的毛细管力之差大于储层内部的毛细管力与上覆静水柱压力之和.圈闭内外势差越大, 它们聚集油气的饱和度越大, 聚集的油气量越多.低势控藏特征与动力学机制分析表明: 对深层来说, 只要储层的物性比周边围岩的物性好到一定程度就能成藏, 即便本身低孔低渗也能有油气聚集.通俗的说, 油气成藏没有死亡线(不考虑油藏经济价值), 这就极大地扩充了含油气盆地油气勘探的领域和深度; 对浅层来说, 高孔渗砂体周边的相对低孔渗砂体能作为有效盖层, 不一定需要有巨厚泥岩充当盖层, 这一观点的提出可以在一定程度上扩大浅层油气勘探的领域和有利区.Abstract: The formation and distribution of hydrocarbon accumulation are controlled by the fluid potential in oil-bearing basin. The distribution characteristics of discovered hydrocarbon accumulation in the Jiyang superdepression show that hydrocarbon could only be accumulated in the reservoir rock where the potential varies from 2 to 100 times of the potential of the surrounding rock. A certain critical value of porosity is necessary for hydrocarbon accumulation in depth. The research also suggests that the porosity decreases and the critical formation condition of hydrocarbon accumulation changes with the burial depth. The trap in the deep burial depth should meet the condition of relatively lower potential compared with the trap in the shallow burial depth. The dynamic analysis and physical experiments also show that the premise condition of hydrocarbon accumulation in the surface of the earth is pore radii in the reservoir rock is double of that in the surrounding rock. The premise condition of hydrocarbon accumulation in the underground reservoir rock is the capillary pressure disparity higher than the sum of capillary pressure and the stratigraphic pressure in the reservoir., which suggests that the lower potential in the trap would cause the higher oil saturation and resources in the reservoir. The characteristics and dynamic analysis suggest that hydrocarbon can be accumulated in the deeper reservoir with low porosity and permeability only if the physical property of reservoir is better than that of the surrounding mudstone, which could extend the hydrocarbon exploration domain and depth. The characteristics also suggest that sand with relative low porosity and permeability can be cap rocks for sand with relatively high porosity and permeability, which could broaden the favorable exploration area in the shallow strata.
-
图 1 低势控油气成藏的概念模型
1.低位能控背斜类油气藏；2.低界面能控岩性油气藏；3.低压能控断块类油气藏；4.低动能控地层类油气藏
Fig. 1. Conception model of low potential controlling on hydrocarbon accumulation
图 3 济阳坳陷油气藏储层物性分布
a.东营凹陷；b.沾化凹陷
Fig. 3. Distribution of reservior physical property in Jiyang depression
图 4 济阳坳陷圈闭界面势能与周边围岩界面势能的关系
Fig. 4. Relationship between trap interfacial potential and surrounding rock interfacial potential in Jiyang depression
图 5 济阳坳陷圈闭周边界面势能与圈闭内部界面势能随埋深变化
a.地层油气藏；b.构造油气藏；c.岩性油气藏
Fig. 5. Change of surrounding and internal interfacial potential to buried depth, Jiyang depression
图 6 势控油气作用物理模拟实验地质模型
从左到右砂岩粒径D分别为：0.1 mm，0.25 mm，0.5 mm，1 mm
Fig. 6. Geological model of physical simulation experiment about potential control on hydrocarbon
图 7 势控油气作用物理模拟实验模型
Fig. 7. The model of physical simulation experiment about potential control on hydrocarbon
图 8 不同围岩粒径砂体势控油气作用物理模拟实验
Fig. 8. The map of physical simulation experiment about potential control on hydrocarbon in different surrounding sizes of sandstone
图 9 4种粒径的砂体含油饱和度与砂体粒径/泥岩粒径关系
Fig. 9. The relationship graph between oil saturation and grain size/shale size in four sizes of sandstone
-
Barker, C., 1980. Primary Migration—The Importance of Water-Organic-Mineral Matter Interactions in Source Rock. AAPG Studies in Geology, Tulsa, Oklahoma, 1-13. Berg, R.R., 1975. Capillary Pressures in Stratigraphic Traps. AAPG Bull, 59(5): 939-956. http://ci.nii.ac.jp/naid/20000775367 Chen, D.X., Pang, X.Q., Qiu, N.S., et al., 2004. Accumulations and Filling Mechanism of Lenticular Sandbody Reservoirs. Earth Science—Journal of China University of Geosciences, 29(4): 483-488(in Chinese with English abstract). http://www.researchgate.net/publication/296747819_Accumulation_and_filling_mechanism_of_lenticular_sandbody_reservoirs Chen, D.X., Pang, X.Q., Qiu, G.Q., et al., 2008. Process Simulation of Hydrocarbon Accumulation Dynamics and Quantitative Forecast of Oil-Bearing Properties for Sand Lens Reservoir. Earth Science—Journal of China University of Geosciences, 33(1): 83-91(in Chinese with English abstract). doi: 10.3799/dqkx.2008.011 Duan, Y.G., Chang, X.C., 2009. Study on Hydrocarbons Accumulation Dynamics and Petroliferous Quality of Lithologic Reservoirs in Linnan Subsag. Journal of Earth Sciences and Environment, 31(3): 272-276(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-XAGX200903008.htm England, W.A., Mackenzie, A.S., Mann, D.M., et al., 1987. The Movement and Entrapment of Petroleum Fluid in the Subsurface. Journal of the Geological Society, Landon, 114(2): 327-347. http://adsabs.harvard.edu/abs/1987JGSoc.144..327E Hao, F., Zou, H.Y., Wang, M.F., et al., 2002. Research Advances and Frontier Areas of Mechanisms of Petroleum Accumulation. Geological Science and Technology Information, 21(4): 7-14(in Chinese with English abstract). http://www.en.cnki.com.cn/Article_en/CJFDTOTAL-DZKQ200204002.htm Hao, F., Zou, H.Y., Fang, Y., 2005. The Difficulties and Frontiers of Subtle Oil/Gas Reservoir Research. Earth Science Frontiers, 12(4): 481-488(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DXQY200504023.htm Hubbert, M.K., 1953. Entrapment of Petroleum under Hydrodynamic Conditions. AAPG Bull, 37(8): 1954-2026. http://www.researchgate.net/publication/308479563_Entrapment_of_Petroleum_Under_Hydrodynamic_Conditions Kang, Y.S., Guo, Q.J., 1998. On Oil and Gas Migration and Accumulation Fluid Dynamic Systems. Earth Science—Journal of China University of Geosciences, 23(3): 281-284(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQKX803.015.htm Li, P.L., Zhang, S.W., Song, G.Q., et al., 2004. Forming Mechanism of Subtle Oil Pools in Fault Basins-Taking the Jiyang Depression of the Bohaiwan Basin as an Example. Petroleum Geology & Experiment, 26(1): 3-10(in Chinese with English abstract). http://www.researchgate.net/publication/306280177_Forming_mechanism_of_subtle_oil_pools_in_fault_basins_Taking_the_Jiyang_depression_of_the_Bohaiwan_Basin_as_an_example Pang, X.Q., Chen, D.X., Li, P.L., et al., 2003. Accumulation Thresholds of Sand Lens and Controlling Mechanism for Oil and Gas Distribution. Acta Petrolei Sinica, 24(3): 38-41(in Chinese with English abstract). http://www.researchgate.net/publication/292753193_Accumulation_thresholds_of_sand_lens_and_controlling_mechanism_for_oil_and_gas_distribution Pang, X.Q., Li, P.L., Zhang, S.W., et al., 2007. Control of Facies-Potential Coupling on Hydrocarbon Accumulation in Continental Faulted Basins and Its Basic Geological Models. Oil & Gas Geology, 28(5): 641-652(in Chinese with English abstract). http://www.en.cnki.com.cn/Article_en/CJFDTOTAL-SYYT200705018.htm 陈冬霞, 庞雄奇, 邱楠生, 等, 2004. 砂岩透镜体成藏机理. 地球科学——中国地质大学学报, 29(4): 483-488. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200404016.htm 陈冬霞, 庞雄奇, 邱桂强, 等, 2008. 砂岩透镜体成藏动力学过程模拟与含油气性定量预测. 地球科学——中国地质大学学报, 33(1): 83-91. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200801014.htm 段云歌, 常象春, 2009. 临南洼陷岩性油藏成藏动力与含油性分析. 地球科学与环境学报, 31(3): 272-276. doi: 10.3969/j.issn.1672-6561.2009.03.008 郝芳, 邹华耀, 王敏芳, 等, 2002. 油气成藏机理研究进展和前沿研究领域. 地质科技情报, 21(4): 7-14. doi: 10.3969/j.issn.1000-7849.2002.04.003 郝芳, 邹华耀, 方勇, 2005. 隐蔽油气藏研究的难点和前沿. 地学前缘, 12(4): 481-488. doi: 10.3321/j.issn:1005-2321.2005.04.017 康永尚, 郭黔杰, 1998. 论油气成藏流体动力系统. 地球科学——中国地质大学学报, 23(3): 281-284. https://www.cnki.com.cn/Article/CJFDTOTAL-SWDG200002021.htm 李丕龙, 张善文, 宋国奇, 等, 2004. 断陷盆地隐蔽油气藏形成机制——以渤海湾盆地济阳坳陷为例. 石油实验地质, 26(1): 3-10. doi: 10.3969/j.issn.1001-6112.2004.01.001 庞雄奇, 陈冬霞, 李丕龙, 等, 2003. 砂岩透镜体成藏门限及控油气作用机理. 石油学报, 24(3): 38-41. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200303007.htm 庞雄奇, 李丕龙, 张善文, 等, 2007. 陆相断陷盆地相-势耦合控藏作用及其基本模式. 石油与天然气地质, 28(5): 641-652. doi: 10.3321/j.issn:0253-9985.2007.05.016 -
下载:
点击查看大图
计量
- 文章访问数: 3206
- HTML全文浏览量: 987
- PDF下载量: 452
- 被引次数: 0
