摘要
宁东油田是中国石化华北分公司主要的石油勘探区块之一,位于鄂尔多斯盆地西缘,在延安组和延长组都已获得工业油流,但是延安组的油源问题一直没有明确,客观上影响了延安组下一步勘探开发决策。确定延安组油源的关键在于客观评价宁东油田中生界尤其是延安组煤系烃源岩的生烃潜力,为此通过对延安组和延长组烃源岩有机质丰度、有机质类型、有机质成熟度等有机地化指标分析,评价延安组烃源岩的生烃能力。研究结果表明,延长组湖相泥岩和延安组泥岩加煤层为宁东油田两套重要烃源岩,宁东油田延安组煤系烃源岩有机质丰度高,生烃母质以Ⅲ型为主,达到生烃门限,具备一定的生烃能力,是延安组主要油源之一。这一研究成果为延安组油藏评价奠定了基础。
Ningdong Oilfield is one of major oil exploration blocks in North China Branch of Sinopec,located the western margin of Ordos Basin,industrial oil flow has been got in both Yanchang and Yan'an Formations,however,the oil source in Yan'an Formation hasn't been clearly defined,which objectively exerts impacts on the next exploration and development decisions of Yan'an Formation.The key to determine Yan'an Formation's oil source is to objectively assess Mesozoic erathem,especially hydrocarbon generation potentials of the coal measure hydrocarbon source rocks in Yan'an Formation,Ningdong Oilfield.Thus by analysis of organic geochemical indicators of hydrocarbon source rocks in Yan'an and Yanchang Formations,such as the organic matter abundance,type and maturity,the hydrocarbon generation potentials were evaluated for hydrocarbon source rocks in Yan'an Formation.The results showed that the lacustrine mudstone in Yanchang Formation and the shale with coal seam of Yan'an Formation are two sets of important hydrocarbon source rocks in Ningdong Oilfield,the abundance of organic matter is high for coal measure hydrocabon source rocks in Yan'an Formation,parent material of hydrocarbons is dominated by typeⅢ,which reaches oil threshold,has a certain hydrocarbon generation potentials and is one of the main oil sources for Yan'an Formation.This research is the foundation of reservoir evaluation in Yan'an Formation.
出处
《录井工程》
2013年第2期84-88,94,共5页
Mud Logging Engineering
关键词
宁东油田
延安组
烃源岩
有机地化指标
Ningdong Oilfield,Yan'an Formation,hydrocarbon source rock,organic geochemical indicator
