【摘要】 采用钻/测井、地震及自然伽马能谱测井的方法,对柴达木盆地跃进斜坡区下干柴沟组进行了高分辨率层序地层研究。下干柴沟组可分为上下两段,可识别出9个层序界面,进而划分出8个四级层序。根据岩心观察认为柴西南跃进斜坡区为辩状河三角洲沉积,研究区主体处于辩状河三角洲前缘相带。结合砂体展布、构造及地震反演,在下干柴沟组层序Ⅲ预测2个可能的岩性圈闭有利区带,是进一步勘探的有利目标。更多还原

【Abstract】 Sequence stratigraphic studies with high resolution were carried out in the Lower Ganchaigou Formation in the Yuejin Slope of the Qaidam Basin by means of drilling/logging,seismic and natural gamma ray spectrometry logging methods.The Lower Ganchaigou Formation was divided into 2 sections vertically.9 sequence boundaries and 8 fourth-order sequences were identified.Based on core observation,the Yuejin Slope was a braided-river delta,and the study area was mainly of braided-river delta front facies.Combined with the studies of sand body distribution,structure and seismic inversion,2 possible favorable zones of lithologic trap were predicted in sequence Ⅲ of the Lower Ganchaigou Formation.更多还原