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

发布时间：2018-02-20 19:14

本文关键词： 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　出处：《吉林大学学报(地球科学版)》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:For the low degree of exploration basin, it is important to explore the selection of high quality source rocks for the exploration direction. In this paper, a large number of test data analysis based on the depression to Hari as the research object, petrology and earth on the group of high quality source rocks in Yingen Yin'e basin chemical characteristics were studied, and the source of organic matter in the source rocks in its formation environment were analyzed. The results show that high quality source rock lithology is micrite dolomite and dolomitic mudstone. The hydrocarbon source rocks of W (TOC) 5.62% on average, high organic abundance; organic matter type I - II type 1 genus, sapropel type or sapropelic organic matter; the maturity of source rock is low, but the bottom has been reached maturation stage, hydrocarbon potential is higher. The mixed organic sources of high quality source rocks from higher plants and aquatic organisms. High quality source rocks Pr/Ph value is 0.19~0.27, the deposition ring was the representative of the strong The gamma wax index is 0.30~0.54, and the content of high gamma wax is the high salinity sedimentary environment. The high productivity and anoxic environment of algal blooms are 2 key conditions for the formation of high-quality source rocks in the Yin Gang formation.

【作者单位】：陕西延长石油(集团)有限责任公司研究院;
【基金】：国家自然科学基金项目(41202104) 陕西延长石油(集团)有限责任公司科技攻关项目(ycsy2016ky-A-09)~~
【分类号】：P618.13

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