Sedimentary Facies and Evolution of early Cretaceous in the Fault Depressions, Songnan Area

Abstract:

Based on the structural geology, sedimentology, palaeontology and geochemistry, the sedimentary facies and evolution patterns are developed in Songnan area from the studies of seismic data, cores, well logs, palaeontology and geochemistry. The result indicates that nearshore subaqueous fan, fan delta, braid delta and lacustrine had been developed in the fault depressions of Songnan area. From the margin to the depocenter of the basin, the sedimentary environments gradually changed from nearshore subaqueous fan, fan delta or braid delta to shore-shallow sediments and middle depth-deep lacustrine. Two stages are divided for the sedimentary evolution of Songnan area, namely the prior stage which appears with Yixian formation developing lava facies and pyroclastic facies; the other is the detrital rock facies ,which are developed from formation Jiufotang to Fuxin, is composed of nearshore subaqueous fan, fan delta, braid delta and lacustrine. Conclusion can be made that those sedimentary facies are controlled by the depth of water variation, which changed from shallow to deep, and then to shallow. Multiple source-reservoir-cap assemblage in vertical provided favourable condition for oil and gas pool forming.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 1036-1040
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.1036
• Online since: January 2012
• Authors: Ya Sheng Wu, Da Kang Zhong, Nan Sheng Qiu, Xiao Ying Zhang
• Keywords: Fault Depressions, Sedimentary Evolution, Sedimentary Facies, Songnan Area

References

[1] WS Hu, BQ Lu, WJ Zhang, et al: An approach of tectonic evolution and dynamics of the Songliao basin. Chinese Journal of Geology Vol. 40 (2005), pp.16-31.

[2] CR Cao, XW Dong. Tectonics and deep structure features of Meso-Cenozoic basin groups, northern NE China. Coal Geology & Exploration Vol. 36 (2008), pp.1-5.

[3] ZY Xu, G LIN,. The characteristics of sequence-stratigraphy-filling and their influences on controlling petroleum system in Changtu Sag. Acta Petrolei SinicaVol. 23(2002), pp.30-33.

[4] C Sun, XM Zhu, GJ Zan, et al. Sand body types and reservoir properties in Cretaceous Jiufotang Formation in Luxi Sag. Petroleum Exploration and Development Vol. 35(2008), pp.569-575.

[5] Huang FM, Yan L, Gong M. The sedimentary facies research of the fault depression in Manghan rift, Kailu area. Inner Mongolia Petrochemical IndustryVol. 9(2008), pp.150-151.

[6] XM Zhu, A Kang, QB Xie, et al. Jurassic sequence stratigraphy and lithologic traps in Qingjiandian depression, Inner Mongolia. Petroleum Exploration and DevelopmentVol. 27(2000), pp.48-52.

[7] LP Yan, X Zhao. The sedimentary systems research of Shahai Formation in southern area of Zhangqiang Depression. Journal of Oil and Gas TechnologyVol. 32(2010), pp.203-205.

[8] FM Shu. Hydrocarbon source rock characteristics and exploration potential evaluation of Liutiao-Changtu rift. Small Hydrocarbon Reservior Vol. 10(2005), pp.5-7.

[9] QJ Wang, GJ Zan, BZ Fang, et al. Accumulation characteristics and petroleum distribution in Jiufotang Formation, the Luxi sag, the Kailu basin. Petroleum Geology & Experiment Vol. 29(2007), pp.373-376.