摘要
结合露头和钻井资料对库车坳陷白垩系进行了层序地层划分 ,共分出 1个一级层序、3个二级层序、8个三级层序 ,对其体系域的构成及其纵、横向变化特征进行了讨论。结果表明 ,沉积物主要来自北部的天山造山带 ;盆地及其充填层序的南北不对称性 ,反映了白垩纪库车坳陷的性质具有前陆盆地的特征。在苏善组的 2个层位发现了厚度达 10～ 2 0m的暗色泥岩 。
This paper has divided Cretaceous sequence stratigraphy of Kuga depression in Northern Tarim Basin into one 1st order sequence, three 2nd order sequences and eight 3rd order sequences based on outcrops, well logs and seismographic profiles. The framework of system tracts and their changes in vertical and lateral directions are discussed. The results show that sediments came mainly from the Northern Tianshan orogenic belt. The asymmetry between north and south Kuqa basin filling sequences shows that the Cretaceous Kuga depression possesses the characteristics of foreland basins. Two layers of dark colored mudstones 10～20 m thick were found in Sushanhe Formation, which suggests that a short period of moist climate occurred during Cretaceous when the climate was mainly dry in the area.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2002年第5期453-458,共6页
Acta Geoscientica Sinica
基金
国家重点基础规划项目"中国典型叠合盆地油气形成富集与分布预测"(编号 :973 G19990 43 3 0 4)资助
