银额盆地哈日凹陷银根组优质烃源岩地球化学特征及其形成环境

doi:10.13278/j.cnki.jjuese.201705103

摘要/Abstract

摘要： 对于低勘探程度盆地，寻找优质烃源岩对于勘探方向的选择具有重要意义。本文基于大量测试分析资料，以哈日凹陷为研究对象，对银额盆地银根组优质烃源岩的岩石学和地球化学特征进行了研究，并对该烃源岩中有机质来源及其形成环境进行了分析。研究表明，优质烃源岩岩性为泥晶白云岩和白云质泥岩。烃源岩w（TOC）平均5.62%，有机质丰度极高；有机质类型为Ⅰ—Ⅱ₁型，属腐泥型，或腐殖腐泥型有机质；烃源岩成熟度较低，但底部已经达到成熟热演化阶段，具有较高的生烃潜力。优质烃源岩的有机质来自高等植物和水生生物的混合源。优质烃源岩Pr/Ph值为0.19~0.27，代表强还原性的沉积环境；伽马蜡烷指数为0.30~0.54，高伽马蜡烷含量表明高盐度的沉积环境。藻类勃发形成的高生产力和缺氧环境是银根组优质烃源岩形成的2个关键条件。

关键词: 银额盆地, 哈日凹陷, 银根组, 优质烃源岩, 地球化学特征, 形成环境

Abstract: For a basin with low degree exploration, looking for the high-quality hydrocarbon source rocks is significant for the choice of exploration direction. Based on a large amount of test and analysis data, we took Hari sag in Yingen-Ejinaqi basin as the research object, and studied the petrological and geochemical characteristics of the high-quality source rocks in Yingen Formation, the source of organic matter, and their forming conditions. The results reveal that the source rocks are micritic dolomites and dolomitic mudstones. The average value of w(TOC) of the source rock is 5.62%, extremely high abundance of organic matters. The organic matter is type I-type Ⅱ₁, belonging to sapropel, or partial sapropel. Although the overall maturity is relatively low, the bottom of the source rocks has reached the mature thermal evolution stage with high potential of hydrocarbon generation. The source of organic matter is the mixed of higher plants and aquatic organisms. The Pr/Ph value of high quality source rocks is 0.19-0.27, which represents a strong reducing sedimentary environment; the gammacerane index is 0.30-0.54, and such high content of gammacerane shows its high salinity of sedimentary environment. High productivity generated by algae blooming and anoxic environment are the two key conditions to form high-quality hydrocarbon source rocks.

Key words: Yingen-Ejinaqi basin, Hari sag, Yingen Formation, high-quality hydrocarbon source rocks, geochemical characteristics, formation environment

中图分类号:

TE121.3

陈治军, 任来义, 贺永红, 刘护创, 宋健. 银额盆地哈日凹陷银根组优质烃源岩地球化学特征及其形成环境[J]. 吉林大学学报(地球科学版), 2017, 47(5): 1352-1364.

Chen Zhijun, Ren Laiyi, He Yonghong, Liu Huchuang, Song Jian. Geochemical Characteristics and Formation Environment of High-Quality Hydrocarbon Source Rocks of Yingen Formation in Hari Sag,Yingen-Ejinaqi Basin[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(5): 1352-1364.

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