松辽盆地昌德气田深层登三、四段底界面特征

松辽盆地昌德气田登娄库组三、四段是深层主要产气层位，但井震地层界面不一致阻碍了该区油气勘探。从岩性、测井和地震等方面对登三、四段主要特征及关键界面特征进行综合研究，获取各段界面主要特征，并据此进行了对界面确定的调整。登三、四段岩性以泥岩为主，发育湖相和曲流河相。登三段电阻曲线呈高频中高幅指状或箱型，底面为一套砂岩组底界，泥岩组顶面，GR 负台阶，电阻正台阶，地震剖面上具有上超和顶超的特征。登四段电阻曲线呈中高频中幅指状夹箱型，底界面为泥岩地层底界、砂岩地层顶界，GR 正台阶，电阻负台阶，地震剖面上表现为整一。井震对比统层后，登三段底面有12 口井，登四段底面有8 口井进行调整。

Interface characteristics of the Third and Fourth Members of Denglouku Formation in deep Changde gas field, Songliao Basin

The Third and Fourth Members of Denglouku Formation （K1d3 and K1d4） are the important gas productive reservoirs in Changde gas field, Songliao Basin. However, the interfaces of K1d3 and K1d4 have been confused in definition before, which impeded the oil and gas exploration. The authors studied the characteristics of K1d3 , K1 d4 and key interface by lithological, logging and seismic analyses, and adjusted the defination of the interfaces based on their characteristics. Lithologically, the K1 d3 and K~ d4 mainly are composed of mudstone, develo- ping lacustrine and meandering river facies. In the K1d3, the resistivity curve presents high frequency, medium- high amplitude, and finger or box shape. The base surface of K1d3 is the bottom boundary of sandstone and top boundary of mudstone, and the gamma ray curve shows negative step shaped, while the elective resistance shows positive step shaped with onlap and toplap characteristics in seismic profile. In the K~ d4, the resistivity curve pres- ents medium-high frequency, medium amplitude, finger and box interbed shape. The base surface of K1 d^4 is the bottom boundary of mudstone and top boundary of sandstone, and the gamma ray curve shows positive step shaped, while the elective resistance shows negative step shaped with concordance characteristics in seismic profile. Thus,the definitions on the imferfaces of 12 wells in the bottom of K1d3 and 8 wells in the bottom of K1d4 were adjusted.