利用综合地球物理资料研究大庆探区外围绥芬河七星镇剖面构造特征及油气远景

通过分析绥芬河-七星镇(简称DB3) 地球物理剖面的位场异常和一阶导数特征, 在波数域利用重力归一化总梯度及相位法进行计算并划分出12条主要断裂。利用频率域的线性反演法计算了盆地基底深度, 并划分出绥阳隆起、敦密断陷、穆棱隆起、鸡西盆地、那丹哈达隆起、勃利盆地、七台河隆起、北兴坳陷和七星镇隆起区, 剖面的重力基底深度为0.9～3.8 km。综合重力和大地电磁测深结果对剖面的9个构造分区进行分析, 并推断敦密断陷内部、鸡西盆地中部和勃利盆地南部分布有3 个油气远景区。

Characteristics of structures and gas-oil potential from Suifenhe to Qixingzhen in the periphery of Daqing prospect area-using synthetical geophysical data

Through the studies of potential field anomaly and the characteristics of its derivative in geophysical section from Suifenhe to Qixingzhen (DB3 for short) , 12 major fractures have been divided by using normalized total gradient method of gravity anomaly and its phase in wave-number domain, and the basement depth of basin has been computed by the method of linear inversion in frequency domain. The authors also divided the area of Suiyang uplift, Dunmi subsidence, Muling uplift, Jixi Basin, Nadanhada uplift, Boli Basin, Qitaihe uplift, Beixing depression and Qixingzhen uplift, and the depth of the gravity floor is 0.9 to 3.8 km. Based on the gravitational and mag-netotelluric data, the authors analyzed nine structural divisions of the section and interp reted there are three promising areas of gas-oil potential in Dunmi subsidence, middle Jixi Basin and southern Boli Basin.