柴西南跃进斜坡区下干柴沟组层序地层研究

Sequence stratigraphy of Lower Ganchaigou Formation in Yuejin Slope, southwestern Qaidam Basin

王波 薛建勤 崔晓松 曹彤 丁旭光 郭少斌

Wang Bo Xue Jianqin Cui Xiaosong Cao Tong Ding Xuguangi Guo Shaobin

中国石油青海油田勘探开发研究院, 甘肃敦煌736202 2. 中国地质大学(北京)能源学院, 北京100083

Research Institute of Petroleum Exploration and Development, Qinghai Oil Field, PetroChian, Dunhuang, Gansu 736202, China 2. School of Energy Resources, China University of Geosciences, Beijing 100083, China

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。

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.

中国石油天然气股份有限公司科技重大专项“柴达木盆地油气勘探开发关键技术研究”(07-01Z)资助

https://doi.org/10.11781/sysydz201204383