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Seismic Reflection Characteristics and Sedimentary Environment Analysis of Wenchang Formation in Northern Depression of Zhujiangkou Basin

MIAO Shun-de,ZHANG Gong-cheng,LIANG Jian-she,GUO Gang,YU Kai-ping(CNOOC Research Institute,Beijing 100027,China)  
The source rock of Wenchang Formation is widely distributed in northern depression of Zhujiangkou basin.The recognition of division and distribution rules is the base of sag evaluation.Based on correlation of well data and seismic reflection,we hold that the top boundary and the bottom boundary of Wenchang Formation are unconformities but conformities towards sag center.The characters of Wenchang Formation boundaries can be divided into four types.Wenchang Formation can be divided into two-three segments on the base of seismic reflection.Through seismic facies and sedimentary environment analysis,we can recognize fan delta(wedgelike,clutter,weak reflection) and alluvial fan(wedgelike,clutter,bright reflection) in the actic region,lacustrine facies(low-frequency,continue,weak to bright reflection towards sag center) in the center of sag and delat(high-frequency,middle continue,weak reflection) in the slope region.Owing to tectonic activities′s diversity,size of grain of sediments is coarse-fine-coarse.
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