Sedimentation and Source Rock Characteristics ofYacheng Formation in Beijiao Sag of Qiongdongnan Basin
Received date: 2012-11-13
Revised date: 2013-01-15
Online published: 2013-08-10
Beijiao Sag lies in the deepwater of Qiongdongnan Basin.It is surrounded by some uplifts and deserves researching in order to find a new exploration area.Using comparative analysis method,by dissecting Yacheng Formation in Yabei Sag carefully,we can know sedimentation and source rock characteristics of Yacheng Formation in Beijiao Sag.Combined with drilling wells′ geochemical index,geothermal characteristics,reservoir-caprock assemblage,we evaluated the exploration potential of Beijiao Sag and obtained the following conclusions.During rifting stage,Beijiao Sag was a half graben.The sub-sag of Yacheng Formation has an area of 1 400km2 and maximum thickness of 2 150m.Compared to the Yacheng Formation of the Yabei Sag,it has similar ancient landform,seismic reflection and sedimentation characteristics.The deposition environment belongs to marine-terrestrial transitional lagoon-tidal flat facies.Coal measure from tidal flat is the dominant source rock,and the lagoon mudstone is important source rock as well.Drilling wells have proved Beijiao Sag can form highly mature coal-derived gas and there are many sets of reservoir-caprock assemblages around the sag.This sag has good exploration potential.
Key words: Qiongdongnan Basin; Beijiao Sag; Yacheng Formation; Source rock; Lagoon; Tidal flat
ZHANG Yi-na,ZHANG Gong-cheng,HE Yu-ping,SHEN Huai-lei,YANG Dong-sheng,SONG Shuang . Sedimentation and Source Rock Characteristics ofYacheng Formation in Beijiao Sag of Qiongdongnan Basin[J]. Natural Gas Geoscience, 2013 , 24(4) : 725 -732 . DOI: 10.11764/j.issn.1672-1926.2013.04.725
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