Research on classification of deep-water channels based on gravity flow facies
Liu Fei1, Zhao Xiao-Ming1,2, Feng Xiao-Fei1, Ge Jia-Wang1,2, Yang Li3, Yang Bao-Quan3, Yang Xi-Pu3
1 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China; 2 Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University, Chengdu 610500,China; 3 CNOOC International Limited,Beijing 100010,China
Abstract：Deep-water channel is an important reservoir for oil and gas storage in deep-water environment. At present,there are many reports on the sedimentary architecture and classification of deep-water channels,but few studies on the classification of single channel were carried out. Current classification schemes are largely based on the erosive capacity of the channel,however,due to the limitation of seismic resolution and outcrop integrity,there are great limitations in practical application. Based on 26 outcrops in the world and the drilling core data of a deep-water basin in West Africa,different gravity flow facies with different fluid dynamics are identified,including the high-density turbidity current facies(HTL),low-density turbidity current facies(LTL)and debris flow facies(DL). According to the proportion of different gravity flow facies in the channel,nine types of single channel can be divided: single high density turbidity filling channel(HTL>70%),single low density turbidity filling channel(LTL>75%),single debris flow filling channel(CL>60%),massive sandy mixed filling channel(HTL=40%~70%,LTL=40%~20%,CL<30%),gravelly sandy mixed filling channel(HTL=40%~70%,LTL<30%,CL=15%~50%),layered sandy mixed filling channel(HTL=5%~60%,LTL=40%~75%,CL<20%),clastic sand mixed filling channel(HTL<40%,LTL=40%~75%,CL=20%~40%),isophase mixed filling channel(HTL=20%~40%,LTL=20%~40%,CL=20%~40%),sandy gravel mixed filling channel(HTL<50%,LTL<60%,CL=40%~60%). Based on field outcrops and the practical application of division scheme in deep-water oilfield,we found that the vertical distribution law of different types of channels are as follows: the channels filled by debris flow lithofacies are often developed at the bottom of channel system,and the channels filled by high-density turbidity flow lithofacies are close to the middle and lower part,and the channels filled by low density turbidity current lithofacies is mainly located in the middle and upper part. According to the percentage of different gravity flow lithofacies within channel,different channel types are clearly defined. This division scheme has better applicability and maneuverability,and is beneficial to deep-water channel reservoir prediction and reservoir quality evaluation in practice.
Liu Fei,Zhao Xiao-Ming,Feng Xiao-Fei et al. Research on classification of deep-water channels based on gravity flow facies[J]. JOPC, 2021, 23(5): 951-966.
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