STRUCTURAL CONTROLS OF PETROLEUM AND GAS DISTRIBUTION ON NORTHERN MARGIN OF QAIDAM BASIN, CHINA
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摘要: 该区中新生代形成了伸展构造、扭动构造、逆冲-褶皱构造等构造样式.早、中侏罗世形成的正断层组合构造样式, 可形成一些小规模油气藏.老第三纪形成的压扭性构造对油气的聚集有重要控制作用.而新第三纪—第四纪形成的逆冲-褶皱构造的含油气性差异很大, 在早期断层基础上发育的逆冲-褶皱构造有利于油气分布, 而新形成的逆冲-褶皱构造, 通常不利于油气聚集.构造应力对油气的运移聚集有重要影响, 构造应力变化速率引起的应力驱动, 是油气沿断层垂向运移的主要动力, 在断层附近应力值适中、岩石扩容量较大、微裂缝发育的区域, 是油气聚集的有利场所.Abstract: Three kinds of structural patterns present on the northern margin of the Qaidam basin in the Mesozoic and Cenozoic are shown in this paper as follows: the extensional structure, the torsional structure, and the thrust-fold structure. The structural pattern of the normal fault assemblage that occurred in the Early and Middle Jurassic may have initiated some small-scale petroleum and gas pools. The compressive torsional structure that occurred in the Early Tertiary may have controlled the accumulation of petroleum and gas. However, the petroleum and gas-bearing properties vary greatly in the thrust-fold structure that occurred in the Late Tertiary-Quaternary. The thrust-fold structure that have developed from the early fault is favorable for the distribution of petroleum and gas. On the other side, the newly-formed thrust-fold structure is usually not favorable for the accumulation of petroleum and gas. The structural stress has an important effect on the migration and accumulation of petroleum and gas. The stress caused by the change in the structural stress rate is the main driving force for the vertical migration of the petroleum and gas along the fault. Near the fault, the stress value is moderately medium, the lithological dilation is relatively great, and the micro-cracks develop well. Such a region is favorable for the accumulation of petroleum and gas.
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图 1 研究区构造分布(据青海石油管理局资料简化)
1.逆断层; 2.背斜轴迹; 3.油气田; 4.探井; 5.地名; 6.周边山系; Ⅰ.呼通诺尔凸起; Ⅱ.昆特依凹陷; Ⅲ.冷湖构造带; Ⅳ.潜西斜坡带; Ⅴ.驼南构造带; Ⅵ.丘村构造带; Ⅶ.赛什腾凹陷; Ⅷ.鱼卡断陷
Fig. 1. Sketch of structure in the study area
图 2 柴达木盆地北缘94314测线地震剖面
Fig. 2. Seismic section along 94314 line on the northern margin of Qaidam basin
图 3 柴达木盆地北缘第三纪末期最大剪切应力等值线(等值线单位: MPa)
Fig. 3. Contour diagram of maximum shear stress at the end of Tertiary on the northern margin of Qaidam basin
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[1] 青藏油气区石油地质编写组. 中国石油地质志(卷十四) [M]. 北京: 石油工业出版社, 1990. [2] 王明儒, 胡文义, 彭德华. 柴达木盆地北缘侏罗系油气前景[J]. 石油勘探与开发, 1997, 24(5): 20~ 24. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK199705005.htm [3] 金之钧, 张明利, 汤良杰, 等. 柴达木盆地中新生代构造演化[J]. 地球学报, 1999, 20(增刊): 68~ 72. https://cpfd.cnki.com.cn/Article/CPFDTOTAL-ZGDJ199910001011.htm [4] 狄恒恕, 王松贵. 柴达木盆地北缘中新生代构造演化探讨[J]. 地球科学——中国地质大学学报, 1991, 16(5): 533~ 539. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX199105007.htm [5] RochetJ H. Stress field, a key to oil migration[J]. AAPG Bull, 1981, 65(1): 74~ 85. [6] Hooper E D. Fluid migration along growth faults in compacting sediments[J]. J Petrol Geo, 1981, 4(4): 161~ 180. https://www.researchgate.net/publication/229783108_Fluid_migration_along_growth_faults_in_Compaqcting_Sediments [7] 华保钦. 构造应力场、地震泵和油气运移[J]. 沉积学报, 1995, 13(2): 77~ 85. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB502.009.htm [8] 曾联波, 田崇鲁. 构造应力场在隐蔽性油气藏勘探中的应用[J]. 现代地质, 1998, 12(3): 401~ 405. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ803.015.htm [9] 黄庆华, 黄汉纯, 马演生. 柴达木盆地构造、三维应力与聚油模式[M]. 北京: 地质出版社, 1996. -
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