Development pattern of shallow-water delta and sandbodies under control of high-frequency base-level cycles: A case study of the Cretaceous Quantou Formation in Fuyu Oilfield, Songliao Basin
Lai Hongfei1,2, Qin Zhi3, Wang Hongjun3, Zheng Xi3, Lin Yangbo3, Bao Zhidong1,2, Li Meijun1,2, Zhang Yunlong1,2, Zhang Li1,2, Wu Yuxiao1,2, Song Jian1,2, He Lingyuan1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 No.5 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi'an 710200,Shaanxi;
Abstract：Shallow-water delta reservoirs play an important role in the petroleum exploration of lacustrine basin,but so far,research based on data of dense well block is rare. Guided by high-resolution sequence stratigraphic theory and sedimentology, and based on 14 core well data and 700 well logging data of the 3rd Group of Member 4 of Cretaceous Quantou Formation in DT91 block of Fuyu Oilfield in Songliao basin,this paper analyzed the development regularity of shallow-water delta and sand bodies under control of high-frequency base-level cycle. The result indicated that: (1)Six types of sandbodies including channel sandbodies,overflowed sandboies,distributary bar,natural levee,crevasse splay and sheet sandbodies are widely developed in the shallow-water delta reservoirs,and channel and distributary bar sandbodies are dominant;(2)Four physical interfaces of base-level cycle including channel erosion surface,progradation-retrogradation,retrogradation-progradation interfaces and flood surface can be indentified in drilling cores and well logging data; seven types of super-short-term base-level cycle can be identified. (3)During the evolution of high frequency base level cycle,the accommodation for a shallow water delta showed little variation,while the sediment supply rate played the main role in the variation of A/S(accommodation increasing rate,A;sediment supply rate,S),and thus controlled the variation of quantity and space contact relationship of genetic sandbodies. As the A/S increased,the scale of shallow water delta and the quantity of genetic sandbodies were rapidly decreased;Accordingly,genetic sandbodies stacking pattern changed from downcuting,overlapping to solitary,and the continuous degree of the planar diatribution of sandbodies changed from higher to lower.
Lai Hongfei,Qin Zhi,Wang Hongjun et al. Development pattern of shallow-water delta and sandbodies under control of high-frequency base-level cycles: A case study of the Cretaceous Quantou Formation in Fuyu Oilfield, Songliao Basin[J]. JOPC, 2017, 19(4): 609-622.
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