RELATIONSHIP BETWEEN THE CHEMICAL CHARACTERISTICS OF FORMATION WATER AND HYDROCARBON ACCUMULATION IN THE DONGYING SAG
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摘要: 对东营凹陷沙河街组地层水化学场的研究发现,地层水的总矿化度具有明显的垂向分带性。沙四段矿化度最高,向上逐渐降低。根据地层水中Ca2+和K++Na+含量随Cl-浓度增大而升高的特征,提出该区地层水化学成分来自于地下岩盐的溶解。水型有CaCl2型、NaHCO3型、MgCl2型和Na2SO4型4种,其中,NaHCO3型水的比重大小与地层水矿化度呈反相关关系。垂向与侧向矿化度分布特征表明,东营凹陷内地层水的流动受断裂与沉积砂体的控制。地层水作为盆地流体的一个重要组成部分,其演化反映了盆地内油气运移、聚集的规律。地层水流动样式为盆地内自生自储式和下生上储式油气藏的形成提供了一个有力的证据。Abstract: It was discovered by study on the chemical field of the Shahejie formation water in the Dongying Sag that the total dissolved solid (TDS) of formation water has explicit vertical zonality.The value of TDS is the highest in the Sha-4 Member,and reduces gradually upward. According to the feature that the Ca2+ and K++Na+ contents in formation water get higher with the increasing of Cl- concentration,it is suggested that the chemical components of formation water in this area come from the dissolution of subsoil rock salt.Among CaCl2, NaHCO3, MgCl2 and Na2SO4 four water types,the specific gravity of NaHCO3-typed water has inverse correlation relationship with the TDS of formation water.The characteristics of vertical and lateral TDS distribution show that the flow of formation water within the Dongying Sag is controlled by faults and sedimentary sand bodies.Formation water is a major component of basin fluid,and its revolution reflects the rules of hydrocarbon migration and accumulation in the basin.The flow styles of formation water provide a powerful evidence for the formation of "self-generation,self-accumulation" and "lower-generation,upper-accumulation" two patterns of hydrocarbon pools in the basin.
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[1] 李思田,路凤香,林畅松,等.中国东部及邻区中新生代盆地演化及地球动力学背景[M].湖北武汉:中国地质大学出版社,1994.1-10. [2] 何生,唐仲华,陶一川,等.松南十屋断陷低压系统的油气水文地质特征[J]. 地球科学——中国地质大学学报,1995, 20(1): 79-84. [3] 徐国盛,刘树根,张英俊,等.川东石炭系天然气富集的水化学条件[J].石油与天然气地质,1999,20(1):15-19. [4] 查明.断陷盆地油气二次运移与聚集[M].北京:地质出版社,1997.27-35. [5] 渠永宏,孙镇城,冯晓杰,等. 冀中坳陷北部潜山地层水水文地质特征及对油气勘探的意义[J]. 大庆石油学院学报,1999,23(3):8-11. [6] 刘群,陈郁华,等.中国中、新生代陆源碎屑-化学岩型盐类沉积[M].北京:北京科学技术出版社,1994.105-200. [7] Hanor J S. 盆地卤水化学成分的一级控制因素[J].地质科技情报,1994,13(1):60-64. [8] Hanor J S. Origin of saline fluids in sedimentary basins[J]. Parnell J. Geofluids: Origin, Migration and Evolution of Fluids in Sedimentary Basins[C]. Geological Society Special Publication,1994,(78):151-174. [9] 付晓泰,王振平,祝孝华. 不同温度、矿化度条件下地层水的密度[J]. 大庆石油学院学报,1998,22(2):6-9. [10] Bjorlykke K. Fluid-flow processes and diagenesis in sedimentary basins[A].Parnell J. Geofluids: Origin, Migration and Evolution of Fluids in Sedimentary Basins[C].Geological Society Special Publication,1994,(78):127-140. [11] Jessop A M & Majorowicz J A. Fluid flow and heat transfer in sedimentary basins[A].Parnell, J. Geofluids: Origin, Migration and Evolution of Fluids in Sedimentary Basins[C]. Geological Society Special Publication,1994,(78):43-54. [12] Knipe R J & McCaig A M. Microstructural and microchemical consequences of fluid flow in deforming rocks[A].Parnell J. Geofluids: Origin, Migration and Evolution of Fluids in Sedimentary Basins[C]. Geological Society Special Publication.1994,(78):99-112. [13] 郝芳,邹华耀,姜建群.油气成藏动力学及其研究进展[J].地学前缘,2000,7(3):11-22. [14] 查明.压实流盆地油气运移动力学模型与数值模拟——以东营凹陷为例[J].沉积学报,1997,15(4):86-90. [15] 徐国盛,刘树根,张英俊,等.川东石炭系天然气富集的水化学条件[J].石油与天然气地质,1999,20(1):15-19. [16] 黄福堂,谭伟,冯子辉. 松辽盆地北部地层水的物理化学性质和特征[J]. 大庆石油地质与开发,1997,16(3):22-25. [17] 张敏,张俊.塔里木盆地轮台断隆油田水组成特征及其意义[J].新疆石油地质,1990,19(3):210-212. [18] 冯乔.吐哈盆地温吉桑现代水文地质条件与油气聚集[J].石油与天然气地质,1997,18(3):224-227. [19] 张建林,陶一川,等.塔里木盆地北部油气田水文地质及水文地球化学特征[J].地球科学,1995,20(3):349-354. -
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