本文選題：德惠斷陷 + 天然氣成因�。� 參考：《東北石油大學》2015年碩士論文

【摘要】：本次論文通過有機質豐度、有機質類型和烴源巖成熟度三個方面研究德惠斷陷營城組、沙河子組和火石嶺組烴源巖地球化學特征。利用天然氣組分特征、碳同位素特征和輕烴特征研究德惠斷陷下白堊統(tǒng)泉頭組至上侏羅統(tǒng)火石嶺組的天然氣地球化學特征以及氣源追蹤問題,取得以下研究成果及認識。德惠斷陷烴源巖以暗色泥巖為主,火石嶺組暗色泥巖厚度與沙河子組暗色泥巖厚度大于營城組泥巖厚度。烴源巖有機質豐度均達到中等以上級別,三個層位相比較,沙河子組優(yōu)于營城組,火石嶺組相對較差。德惠斷陷烴源巖類型以中間型為主,略偏腐殖型,其中營城組泥巖多為Ⅱ1型和Ⅱ2型、沙河子組和火石嶺組泥巖以Ⅱ1、Ⅲ型為主。德惠斷陷有機質成熟度為成熟~高熟階段,說明德惠斷陷烴源巖具有良好的生氣潛力。德惠斷陷天然氣以烴類氣為主,天然氣性質以濕氣為主,泉頭組至營城組天然氣為成熟階段,沙河子組和火石嶺組天然氣處于成熟到高成熟階段。根據(jù)天然氣組分和正常碳同位素分析表明德惠斷陷天然氣為有機成因氣。天然氣組分表明德惠斷陷泉頭組、登婁庫組天然氣屬于腐泥型天然氣;營城組屬于腐殖型天然氣;沙河子組與火石嶺組天然氣屬于腐泥型天然氣。通過單井同位素分析可知,泉頭組以油型氣為主,存在煤成氣與油型氣混氣;營城組合3與合4為煤成氣貢獻較大;沙河子組農103井,火石嶺組農101井可能油型氣貢獻較大。利用輕烴各項指標表明沙河子組和火石嶺組天然氣以油型氣為主。綜合上述三種方法分析研究表明,泉頭組和登婁庫組天然氣以油型氣為主,營城組天然氣以煤型氣為主,沙河子組和火石嶺組天然氣以油型氣為主。利用天然氣組分特征,碳同位素特征,輕烴參數(shù)結合聚類分析和秩和檢驗法進行氣源對比得出,泉頭組、登婁庫組和營城組天然氣主要來自于營城組和沙河子組烴源巖,沙河子組天然氣主要來源于沙河子組本身源巖,部分來自于火石嶺組源巖,火石嶺組天然氣來源于沙河子組和火石嶺組烴源巖。
[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，

本文編號：1850713