镜质体反射率抑制与烃源岩质量关系——以渤海湾盆地东营凹陷烃源岩为例

THE RELATIONSHIP BETWEEN VITRINITE REFLECTANCE SUPPRESSION AND SOURCE ROCK QUALITY—A CASE STUDY ON SOURCE ROCKS FROM THE DONGYING SAG, BOHAI BAY BASIN

李志明 秦建中 徐旭辉 刘文斌 施伟军 蒋宏

Li Zhiming Qin Jianzhong Xu Xuhui Liu Wenbin Shi Weijun Jiang Hong

中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083

Wuxi Research Institute of Petroleum Geology, RIPEP, SINOPEC, Wuxi, Jiangsu 214151, China 2. Research Institute of Petroleum Exploration and Production, SINOPEC, Beijing 100083, China

FAMM(fluorescence alteration of multiple macerals)技术是目前解决烃源岩镜质体反射率抑制问题的唯一有效方法。该文对渤海湾盆地东营凹陷不同类型烃源岩进行FAMM分析的同时,也进行了镜质体反射率测定。在此基础上,综合前人研究成果分析了镜质体反射率抑制与烃源岩质量的关系。研究结果揭示,东营凹陷烃源岩镜质体反射率抑制程度与烃源岩质量关系密切,烃源岩质量越好,其镜质体反射率抑制程度越大。Ⅰ型烃源岩镜质体反射率一般抑制0.20%～0.35%,平均为0.30%;Ⅱ1型烃源岩镜质体反射率一般抑制0.15%～0.30%,平均为0.22%;Ⅱ2型烃源岩镜质体反射率一般抑制0.10%～0.18%,平均为0.15%;而Ⅲ型烃源岩的镜质体反射率一般不抑制或抑制程度很低,为0.0%～0.05%。镜质体反射率受抑制的影响因素复杂,东营凹陷烃源岩镜质体反射率抑制程度与氢指数间具有显著的正相关性,表明东营凹陷烃源岩镜质体反射率受抑制主要与烃源岩富氢密切相关,这与烃源岩质量越好,镜质体反射率抑制程度越高相吻合。

FAMM(fluorescence alteration of multiple macerals) technique is an only effective method for resolving vitrinite reflectance suppression of source rock at present.The FAMM and vitrinite reflectance of various type source rocks are determined in this paper.The relationship between vitrinite reflectance suppression and source rock quality is studied on the basis of measured data and combined with result of predecessors.The studied results show that the levels of vitrinite reflectance suppression are closely related to source rocks quality.The level of vitrinite reflectance suppression is relatively higher in the source rock with better quality.The level of vitrinite reflectance suppression for the source rocks characterized by type Ⅰorganic matter usually ranges from 0.20%～0.35%,average 0.30%;for those characterized by type Ⅱ1 it usually ranges from 0.15%～0.30%,average 0.22%;for those characterized by type Ⅱ2 it usually ranges from 0.10%～0.18%,average 0.15% and for those characterized by type Ⅲ it usually ranges from 0.0%～0.05%,i.e.no suppression or slightly suppression.The vitrinite reflectance suppression is affected complexly by many factors.The levels of vitrinite reflectance suppression of the source rocks from Dongying Sag having positive relationship with hydrogen index shows that vi-trinite reflectance suppression is closely related to relatively more perhydrous of source rocks.This is consistent with better quality source rocks with high level of vitrinite reflectance suppression.

中国石油化工股份有限公司科学技术研究开发项目(P05038)

https://doi.org/10.11781/sysydz200803276