Sedimentary Facies Types and Evolution Models of the Shahezi Formation in the Xujiaweizi Fault Depression,Songliao Basin
[Objective]The tight glutenite reservoir of the Shahezi Formation in the Xujiazi Fault Depression has great potential for natural gas exploration and is expected to become the key replacement field of deep volcanic gas reservoir exploration in Daqing oilfield.[Methods]The distribution of sedimentary facies and evolution models of the Shahezi Formation in the Xujiaweizi Fault Depression were studied using comprehensive core,logging,and seismic data.[Results and Conclusions]The results show that there are braided river delta,fan delta,far shore turbidite fan with supply channel,near shore subaqueous fan,slump turbidite fan in front of fan delta,shallow lake-semi-deep lake,and deep lake deposits in the Shahezi Formation of the Xujiaweizi Fault Depression.The gentle slope belt on the east side of the Anda,Xudong,and Zhaozhou Depressions received the detritus from the Zhaodong-Chaoyanggou basement paleo-uplift and developed braided river delta deposits;locally developed lacustrine turbidite fan deposits were formed by distant source supply channels.The western steep slope belts such as the Anda-Xudong,Xuxi,and Zhaozhou Depressions received coarse debris from the Central fault uplift area and developed a fan delta depositional system,which was characterized by near source and short flow.Nearshore subaqueous fan depositions were locally developed,and due to the instability of fan delta depositional bodies developed on the edge of lake ba-sin,slump turbidite fan depositions were formed in front of fan delta depositional bodies.
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