渤中坳陷优质烃源岩有机质丰度下限标准  

Lower limit standard of organic matter abundance of high quality source rocks in Bozhong Depression

作　　者：刘伟[1] 王振奇[1] 叶琳 刘丽芳 黄胜兵 LIU Wei;WANG Zhenqi;YE Lin;LIU Lifang;HUANG Shengbing(School of Geosciences,Yangtze University,Wuhan 430100,China;China National Offshore Oil Corporation Research Institute,Beijing 100029,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国海洋石油公司研究院,北京100029

出　　处：《断块油气田》2020年第6期725-728,共4页Fault-Block Oil & Gas Field

摘　　要：前人多通过对有机质丰度数据的统计学分析,确定优质烃源岩的有机质丰度下限,但无法体现优质烃源岩对油气成藏的主要贡献作用。为了揭示渤中坳陷优质湖相烃源岩的有机质丰度下限,根据前人利用原始有机质丰度与排烃量的关系确定丰度下限的思路,对渤中坳陷主要层段烃源岩原始总有机碳质量分数与排烃量进行计算,并作散点分析。结果显示:原始总有机碳质量分数较低时,排烃量极低;而当原始总有机碳质量分数升至某一阈值时,排烃量急剧增加,即确定该阈值为优质烃源岩残余有机碳质量分数下限。其中,东三段阀值为1.74%,沙一段为1.70%,沙三段为1.85%。Most of the previous research used the statistics analysis of the organic matter abundance to define the lower limit standard of the high quality source rocks.This method cannot reflect the main contribution of high quality source rocks to hydrocarbon accumulation.In order to reveal the lower limit standard of organic matter abundance of the high quality lacustrine source rocks in Bozhong Depression,based on the previous idea of determining the lower limit standard by using the relationship between original organic matter abundance and hydrocarbon expulsion amount,the original total organic carbon content(TOC)and hydrocarbon expulsion amount of the main source rocks were calculated and their scatter diagram was analyzed.The result shows that when the original TOC is low,the hydrocarbon expulsion amount is very low.However when the original TOC rises to a certain threshold,the hydrocarbon expulsion amount increases sharply,and this threshold is the lower limit of residual TOC of high quality source rocks.The threshold is 1.74%for the third member of Dongying Formation,1.70%for the first member of Shahejie Formation,and 1.85%for the third member of Shahejie Formation.

关 键 词：优质烃源岩 有机质丰度 下限标准 渤中坳陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]