Some basic sedimentological problems and research prospects of deep-water gravity-flow sedimentary in oil and gas exploration
YU Jixing, YANG Tian, TIAN Jingchun, CAI Laixing, REN Qiqiang, GUO Weixue
State Key Laboratory of Oil and Gas Reservior Geology and Exploitation(Chengdu University of Technology), Institute of Sedimentary Geology,Chengdu 610059,China
Abstract The oil and gas resources stored in deep-water gravity-flow sediments are extremely abundant,but there are still many problems in understanding the distribution of deep-water gravity-flow sedimentary sand bodies and high-quality reservoirs at present. These problems restrict the exploration and development of oil and gas. The transition from supercritical to subcritical turbidity current under the control of hydraulic jumping and the transformation of turbidity current to muddy debris flow under the control of turbulence damping are two key issues that form the new understanding of the distribution of gravity flow deposits. Deep-water gravity flow deposits have numerous architectural elements,including channel and levee,channel-lobe transition zone,and lobe. The detailed analysis of identification marks of different architectural elements is critical to understanding of the distribution of gravity flow deposits. The strong erosion of substrate by hydraulic jump during the transition from supercritical to subcritical turbidity current is the new understanding for the formation of gravity flow channels. Tectonic activity,sediment supply, and the interaction between climate and sea(lake)level are external factors of sedimentary basins that control the distribution of gravity flow deposits. Water density of sedimentary basin,topographic slope, and basin bottom topography are internal factors that determine the distribution of gravity flow deposits. The synergistic diagenesis of sand and mud during the burial and diagenetic evolution of deep-water gravity flow deposits plays an important role in the development of high-quality reservoirs with relatively high porosity and permeability. Research on the depositional process that emphasizes both ancient outcrops and modern-day monitoring,deep-water gravity flow sedimentary architectural elements and inner structure,deep-water gravity flow-caused fine-grained sedimentation and shale oil and gas research,deep-water gravity flow sedimentary sand body diagenesis are expected to be the next step of sedimentological research prospects of deep-water gravity flow sedimentary oil and gas exploration.
Fund:National Natural Science Foundation of China(No.42072126)and the Natural Science Foundation of Sichuan Province(No.2022NSFSC0990)
Corresponding Authors:
YANG Tian,born in 1989,is a researcher. He is engaged in researches on sedimentology and oil & gas reservoir geology. E-mail: yangtian19@cdut.edu.cn.
About author: YU Jixing,born in 1997,is a master's degree candidate and majors in geology. He is engaged in research on sedimentology. E-mail: yujixing1997@163.com.
Cite this article:
YU Jixing,YANG Tian,TIAN Jingchun et al. Some basic sedimentological problems and research prospects of deep-water gravity-flow sedimentary in oil and gas exploration[J]. JOPC, 2023, 25(6): 1299-1314.
YU Jixing,YANG Tian,TIAN Jingchun et al. Some basic sedimentological problems and research prospects of deep-water gravity-flow sedimentary in oil and gas exploration[J]. JOPC, 2023, 25(6): 1299-1314.
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