松辽盆地王府断陷埋藏史

为研究松辽盆地王府地区油气的生、运、聚及成藏过程,根据王府断陷的构造特征及相关资料,采用泥岩声波时差法、镜质体反射率法、趋势分析法计算研究区火石岭组末期、营城组末期、嫩江组末期地层的剥蚀量,恢复研究区的埋藏史.结果表明：火石岭组沉积时期为断陷形成的初始时期,各地区沉积厚度不同;沙河子组—营城组沉积时期,表现为快速沉积和快速埋藏的特征;营城组末期地层反转抬升遭受剥蚀,剥蚀量具有东大西小的特征;登娄库组—嫩江组时期,具有较快速的沉积和埋藏特征;嫩江组末期,王府断陷一直处于抬升剥蚀状态,剥蚀剧烈,嫩三段以上地层普遍缺失.该结果为研究区油气评价提供了有益参考.

Burial history of Wangfu fault depression in Songliao Basin

Aimed at investigating the hydrocarbon generation,expulsion,migration and accumulation in Wangfu area in Songliao Basin,this paper,based on the geological structure and the available data of Wangfu fault depression and using the sonic time difference method,the vitrinite reflectance difference method,and the trend analysis method,introduces a calculation of denudation amount in the Late Huoshiling formation,the Late Yingcheng formation and the Late Nenjiang formation in order to rebuild the buried history of study area.The results indicate that the Huoshiling formation is marked by the sedimentary period,classified as the initial period of the Wangfu fault depression in which the sedimentary thickness varies with regions; the sedimentary period ranging from Shahezi formation to the Yingcheng formation is characterized by a fast deposition and fast burial; the Late Yingcheng formation is distinguished by the denudation produced by stratigraphic inversion and uplift,resulting in a greater denudation in the east than in the west; the period from the Denglouku formation to the Nengjiang formation features a faster deposition and burial ; and the Late Nenjiang formation is followed by the occurrence of the constantly violent denudation to which the Wangfu fault depression is subjected,due to uplift and denudation,and a widespread absence of the formation above Nen 3.The research could give a useful reference for the hydrocarbon appraisement of the study area.