| In order to clarify the sequence stratigraphy and sedimentary facies distribution of Donghe Sandstone
Member-Breccia Member of Bachu Formation in the eastern Lunnan ancient buried hill-Caohu Sag of Tabei Uplift,
Tarim Basin, the sequence stratigraphy and sedimentary environment in the study area were studied based on drilling,
logging and seismic data by applying the principles of sedimentology, sequence stratigraphy and seismic sedimentology.
The results show that the Donghe Sandstone Member can be divided into three parasequences, the Breccia Member can be
divided into one parasequence, and these four parasequences are named DH-1, DH-2, DH-3 and DH-4 from bottom to
top. These four parasequences all developed in marine transgressive sendimentary environment. A fan-delta-shore
sedimentary system are mainly developed during the deposition period of Donghe Sandstone Member-Breccia Member in
the study area, in which the first and fourth parasequences are dominated by fan-delta deposits, and the second and third
parasequences are dominated by marine shore sandstone deposits. The above understanding has an important reference
role for the exploration of structural-lithologic oil and gas traps in the eastern Lunnan ancient buried hill-Caohu Sag of
the Tabei Uplift. |
