CAJ | 학술논문

选取东营凹陷第三系11块泥质烃源岩样品,粉碎后按小于1.6g/cm~3,1.6～2.2g/cm~3和大于2.2g/cm~3的密度,分离成1,2,3三个组分,希望可以把烃源岩中游离的有机质、无机矿物与有机黏土复合体分别提取出来.对各组分进行质量、有机碳及扫描电镜分析,探讨不同密度组分中有机质赋存形式及有机碳分配方式的差异性.密度分组后各组分的质量、有机碳量回收率基本上达到100%.表明密度分离方法可信,且对烃源岩的破坏较弱.通过扫描电镜观察发现,1组分中存在大量的生物碎屑有机质,经盐酸处理后,有机质颗粒表面干净,而2,3组分中只见有大量的矿物颗粒,但能谱分析显示了C元素的存在.这些特征表明1组分为生物碎屑有机质,而2,3组分中有机质与无机矿物相混合.有机碳分析表明,1组分有机碳含量平均高达14.24%,但其仅占全岩有机碳量的1.11%;2,3组分中有机碳含量分别为3.26%,2.77%,两者占全岩有机碳量的90%以上.由此看来与无机矿物相结合是烃源岩中有机质较为重要的赋存方式,这部分有机质对全岩生烃量的贡献不容忽视.
선취동영요함제삼계11괴니질경원암양품,분쇄후안소우1.6g/cm~3,1.6～2.2g/cm~3화대우2.2g/cm~3적밀도,분리성1,2,3삼개조분,희망가이파경원암중유리적유궤질、무궤광물여유궤점토복합체분별제취출래.대각조분진행질량、유궤탄급소묘전경분석,탐토불동밀도조분중유궤질부존형식급유궤탄분배방식적차이성.밀도분조후각조분적질량、유궤탄량회수솔기본상체도100%.표명밀도분리방법가신,차대경원암적파배교약.통과소묘전경관찰발현,1조분중존재대량적생물쇄설유궤질,경염산처리후,유궤질과립표면간정,이2,3조분중지견유대량적광물과립,단능보분석현시료C원소적존재.저사특정표명1조분위생물쇄설유궤질,이2,3조분중유궤질여무궤광물상혼합.유궤탄분석표명,1조분유궤탄함량평균고체14.24%,단기부점전암유궤탄량적1.11%;2,3조분중유궤탄함량분별위3.26%,2.77%,량자점전암유궤탄량적90%이상.유차간래여무궤광물상결합시경원암중유궤질교위중요적부존방식,저부분유궤질대전암생경량적공헌불용홀시.
11 samples of Tertiary argillaceous hydrocarbon source rocks in the Dongying Depression were selected and separated into three fractions according to density difference ( < 1.6 g/cm~3, 1.6-2.2g/cm~3 and > 2.2 g/cm~3) after crushing them in order to extract the free organic matter, inorganic minerals and organo-clay complex from the argillaceous hydrocarbon source rocks (labeled as 1, 2 and 3, respectively). The quantities and TOC of different fractions were tested and observed by scanning electron microscopy to explore the differences of the occurrence forms of organic matter and the modes of organic carbon distribution in different density fractions. After the density separation, the recovery rate of the quantity and the organic carbon of different fractions approximately reached 100%. These features show credibility of the density separation method and less destruction to hydrocarbon source rocks. Through the observation of each fraction by scanning electron microscopy, we found existence of a large number of biological debris in the fraction 1. After hydrochloric acid treatment, the surface of the biological debris became clearer in the fraction 1, while in the fractians 2 and 3, a large number of mineral grains can be observed. The energy spectrum analysis shows existence of element carbon. These features indicate that the fraction 1 is mainly the organic matter of biological debris,while the fractions 2 and 3 are the organic matter mixed with the inorganic minerals.Through analysis of the TOC and the amount of organic carbon of different fractions,we found that the average TOC content of the fraction 1 is about 14.24%,but it occupies only about 1.11% of the total amount of organic carbon in the wholerock samples.The TOC values of the fractions 2 and 3 are 3.26%and 2.77%,respectively,totally occupying more than 90% of the tatal amount of the organic carbon in the whole rocks.From this point of view,the mode of combination with the minerals is the most important occurrence form of organic matter in the hydrocarbon source rocks.This part of organic matter for the hydrocarbon-generating capacity of whole rocks call not be ignored.