碎屑岩中岩相对碳酸盐矿物富集有机质的影响  

Impacts of Lithofacies of Clastic Rocks on Enrichment of Organic Matters in Carbonate Minerals

作　　者：杨燕[1,2] 雷天柱[1] 斯贵才[1] 蔡进功[3] 邢蓝田[1] 

机构地区：[1]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]海洋地质国家重点实验室同济大学,上海200092

出　　处：《特种油气藏》2015年第4期86-90,155,共5页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金"不同赋存状态有机质的生烃特征和生烃贡献研究"(41072107);"海相高-过成熟烃源岩成熟度判识新指标的研究"(41272147)和"泥页岩中不同赋存态烃的分离和特征研究"(41372130)

摘　　要：通过盐酸酸解破坏碳酸盐矿物的方法,获取了碎屑沉积环境中碳酸盐矿物牢固束缚的可溶有机质,即氯仿沥青"C",并进行了不同环境间可溶有机质及其馏分的差异比对及富集、贫化规律的研究。研究发现:水体较深时形成的碳酸盐矿物主要富集烃类化合物,但富集能力较差;水体较浅时形成的碳酸盐矿物主要富集极性较强或分子质量相对较大的化合物,但富集能力较强。对于这些碳酸盐牢固束缚的有机质母质,若发生二次生烃,对于半深水、深水生成者,贡献的是少量的优质油气;对于浅水生成者,贡献的油质不好,但含量较大。在进行油气精细评价时要综合考虑碳酸盐矿物的形成时间及沉积环境。Through acidolysis of hydrochloric acid( HCl),carbonate minerals are destructed to extract dissolvable organic matters,i. e. chloroform asphalt 'C',contained in carbonate minerals in clastic sedimentary environment. In addition,researches are made to highlight differences in dissolvable organic matters and their fractions,together with patterns of their enrichment and dilution. Research results show that carbonate minerals formed in relatively deep waters contain predominantly hydrocarbons,but with relatively low enrichment capacity,while carbonate minerals formed in shallower waters contain compounds with high polarity or relatively high molecular weights,but with relatively high enrichment capacities. As for organic matrix tightly bounded by carbonates,in case of secondary hydrocarbon generation,those contained in semi- deep and deep water may contribute a small amount of high- quality hydrocarbons,whereas those generated in shallower water may contribute large volumes of poor quality hydrocarbons. Both the formation time and the sedimentary environment of carbonate minerals should be considered during detailed appraisal of hydrocarbon reservoirs.

关 键 词：氯仿沥青“C” 碳酸盐矿物 富集排斥能力 沉积环境 碎屑岩 

分 类 号：TE122.1[石油与天然气工程—油气勘探]