定边罗庞塬地区长8油层组双物源对石油分布的控制

1.延长油田股份有限公司 定边采油厂,陕西 定边 718600; 2.西北大学 地质学系,陕西 西安 710069

定边罗庞塬地区; 长8油层组; 双物源; 岩石学特征; 石油分布

Control of double sources of Chang 8 oil-bearing layer to oil distributions at Luopangyuan area of Dingbian County
REN Jian1,ZHANG Gang1,LIU Wan-ming1,WANG Wei1,

(1.Dingbian Oil Production Plant,Yanchang Oil Field Limited-Liability Company,Dingbian 718600,China; 2.Department of Geology,Northwest University,Xi'an 710069,China)

Luopangyuan area in Dingbian; Chang 8 oil bearing layers; double sources; petrological characteristics; oil distributions

备注

定边罗庞塬地区长8油层组是定边油田主力产油层,储层及石油分布非均质性很强,长8油层组沉积微相及石油分布明显受西北及东北方向双物源控制,因此研究长8油层组双物源的交汇位置、双物源岩石学特征的差异性及双物源对沉积微相和石油分布的控制作用具有重要实践价值。通过铸体薄片、X-衍射全岩分析技术研究了双物源岩石学特征,通过沉积相分析技术研究了长8油层组的相带展布规律,通过油藏分析技术研究了长8油层组石油分布规律。结果 表明:研究区长8油层组西北物源具有高石英、低长石及高沉积岩岩屑、高变质岩岩屑、低岩浆岩岩屑的特征,东北物源具有高长石、低石英及高岩浆岩岩屑、高变质岩岩屑、低沉积岩岩屑的特征; 长8油层组在研究区为三角洲前缘沉积,西部相带呈北西向延伸,在研究区东部相带呈北东向延伸,在研究区中部叠合连片; 长8油层组的石油分布且具有明显的分割性,分别呈北西向、北东向延伸。上述研究反映出定边罗庞塬地区长8油层组石油的宏观分布明显受北西、北东向双物源的控制。

Chang 8 oil bearing layers in Luopangyuan area are the main oil producting layers in Dingbian oil field,with reservoirs and oil distribution heterogeneity being very strong,Chang 8 sedimentary microfacies and distribution of oil reservoir was obviously controlled by the northwest and northeast of dual source,therefore it will be of great practical value to study the position of the intersection of chang 8 reservoir double source,the difference of rock characteristics of double source and the controlling effect of double source on the distribution of the sedimentary microfacies and oil.Through the cast-slice and y diffraction whole rock analysis technology to study the double source petrology characteristics,via the sedimentary facies analysis technology to study the chang 8 reservoir facies belt distribution regularity,and by mearns of the analysis of the reservoirs to study the oil distribution regularity of Chang 8 reservoir.Results show that the northwest source of Chang 8 reservoir of research district has high quartz,low feldspar and high sedimentary rock debris,high metamorphic rock debris and low magmatic rock debris,the northeast source has high feldspar,low quartz and high magmatic rock debris,high metamorphic rock debris and low sedimentary rock debris; Chang 8 reservoirs in the study area are delta front depositions,with facies belt extending northwest in the west and northeast in the east of the researched area,and connecting together in the middle of the study area.Facies belts and oil distributions of Chang 8 reservoirs are obviously segmented,respectively extending northwest and northeast.The study shows that double sources controlled macroscopic oil distributions in Chang 8 reservoirs in Luopangyuan area,Dingbian County.