Analysis on Forming Conditions of Lithologic Trap in Liushagang Formation, Weixinan Depression of BBW Basin

Abstract

Abstract:

Weixinan Depression is a typical dustpan-like rift in BBW Basin, which has experienced three tectonic movements in Paleogene, displays polycyclic sedimentary characteristics, develops several sets of source-reservoir-cap rock associations. According to the analysis on Paleogene stratigraphic framework using sequence stratigraphy, sequences in the second section of Liushagang Formation and in lower and upper sequences of the first section of Liushagang Formation are the main sequences in which lithologic traps were developed. The development and formation of lithologic traps were strictly controlled by different system tract types in third order sequences of Paleogene. The detailed performances are: lithologic traps mainly developed in lowstand system tract and lacustrine transgressive system tract of sequence in the second section of Liushagang Formation, in lowstand system tract of lower sequences in the first section of Liushagang Formation and in highstand system tract of upper sequences in the first section of Liushagang Formation. Abundant sedimentary system types resulted from multisource filling were important to the formation of various lithologic traps. Nearshore underwater fan lithologic trap, fan delta lithologic trap which developed in steep slope belt, turbidite channel lithologic trap in gentle slope belt and sublacustrine fan lithologic trap which developed in sag belt are favorable targets.

Key words: Weixinan Depression, lithologic trap, stratigraphic framework, sedimentary system, seismic facies, BBW Basin

CLC Number:

TE122.3

LIU Zhen, TAN Zhuo, CAI Dong-sheng, LIU Ming-quan, FU Dong-yang. Analysis on Forming Conditions of Lithologic Trap in Liushagang Formation, Weixinan Depression of BBW Basin[J]. Geoscience, 2008, 22(2): 239-246.

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