德惠断陷天然气成因研究

发布时间：2018-05-06 04:09

  本文选题：德惠断陷 + 天然气成因　； 参考：《东北石油大学》2015年硕士论文

【摘要】：本次论文通过有机质丰度、有机质类型和烃源岩成熟度三个方面研究德惠断陷营城组、沙河子组和火石岭组烃源岩地球化学特征。利用天然气组分特征、碳同位素特征和轻烃特征研究德惠断陷下白垩统泉头组至上侏罗统火石岭组的天然气地球化学特征以及气源追踪问题,取得以下研究成果及认识。德惠断陷烃源岩以暗色泥岩为主,火石岭组暗色泥岩厚度与沙河子组暗色泥岩厚度大于营城组泥岩厚度。烃源岩有机质丰度均达到中等以上级别,三个层位相比较,沙河子组优于营城组,火石岭组相对较差。德惠断陷烃源岩类型以中间型为主,略偏腐殖型,其中营城组泥岩多为Ⅱ1型和Ⅱ2型、沙河子组和火石岭组泥岩以Ⅱ1、Ⅲ型为主。德惠断陷有机质成熟度为成熟~高熟阶段,说明德惠断陷烃源岩具有良好的生气潜力。德惠断陷天然气以烃类气为主,天然气性质以湿气为主,泉头组至营城组天然气为成熟阶段,沙河子组和火石岭组天然气处于成熟到高成熟阶段。根据天然气组分和正常碳同位素分析表明德惠断陷天然气为有机成因气。天然气组分表明德惠断陷泉头组、登娄库组天然气属于腐泥型天然气;营城组属于腐殖型天然气;沙河子组与火石岭组天然气属于腐泥型天然气。通过单井同位素分析可知,泉头组以油型气为主,存在煤成气与油型气混气;营城组合3与合4为煤成气贡献较大;沙河子组农103井,火石岭组农101井可能油型气贡献较大。利用轻烃各项指标表明沙河子组和火石岭组天然气以油型气为主。综合上述三种方法分析研究表明,泉头组和登娄库组天然气以油型气为主,营城组天然气以煤型气为主,沙河子组和火石岭组天然气以油型气为主。利用天然气组分特征,碳同位素特征,轻烃参数结合聚类分析和秩和检验法进行气源对比得出,泉头组、登娄库组和营城组天然气主要来自于营城组和沙河子组烃源岩,沙河子组天然气主要来源于沙河子组本身源岩,部分来自于火石岭组源岩,火石岭组天然气来源于沙河子组和火石岭组烃源岩。
[Abstract]:The geochemical characteristics of hydrocarbon source rocks of Yingcheng formation, Shahezi formation and Huoshiling formation in Dehui fault depression were studied in this paper by means of abundance of organic matter, type of organic matter and maturity of source rocks. Based on the characteristics of natural gas components, carbon isotopes and light hydrocarbons, the geochemical characteristics and gas source tracing of the Lower Cretaceous Quantou formation in the Lower Cretaceous and the Huoshiling formation of the Upper Jurassic are studied, and the following research results and understandings are obtained. The source rocks in Dehui fault depression are mainly dark mudstone. The thickness of dark mudstone in Huosiling formation and Shahezi formation is greater than that in Yingcheng formation. The abundance of organic matter in source rocks is above medium level. Compared with the three layers, the Shahezi formation is better than the Yingcheng formation, and the Huosiling formation is relatively poor. The source rocks of Dehui fault depression are mainly intermediate type and slightly humic type. The mudstone of Yingcheng formation is mainly of type 鈪，

本文编号：1850713