资福寺洼陷盐湖层序密集段特征及其油气意义

Lake-salt Basin Condensed Section Features and Oil Significance of Zifisi Sag

结合湖盆特征,在层序格架下研究资福寺洼陷下第三系沙市组和新沟咀组密集段在三级层序内的发育特征,沙市组和新沟咀组均以初始湖泛面和最大湖泛面为界,分为低位体系域、水进体系域、高位体系域。井、震结合,发现沙市组密集段主要集中在高位体系域下部,新沟咀组由于高位体系域时气候炎热,水体下降,物源减少,密集段主要集中在水进体系域,通过密集段反射特征在地震剖面上的识别及确定厚度,分析烃源岩的时空展布。

In combination with the characteristics of the lacustrine basins,research the development characters of condensed section in third-order sequence was studied under the condition of sequence stratigraphic framework.Initial lake flooding plan and maximum lake flooding plan are as boundary sequence for the Shashi Formation and the Xingouzui Formation,they were divided into low-stand system domain,transgressive system domain and highstand system domain.In combination with drilling data and seismic data,it is found out that the condensed section of Shashi Formation is mainly concentrated in the lower part of the highstand system domain and the condensed section of Xingouzui Formation is mainly in the transgressive system domain because of the hot climate,thus lake level drops and material source reduces.Through the recognition of condensed section reflection characteristics in seismic profile and the identification of its thickness,the time and spatial distribution the source rocks is analyzed.