A ternary sand control model of river-dominated delta in tectonic stability period
Li Yuan-Hao1, Song Fang-Xin2, Han Peng2, Zhang Ya-Qin2, Yang Yi-Ming1
1 School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China; 2 The Tenth Oil Plant of PetroChina Changqing Oilfield Company,Gansu Qingcheng 745100,China
Abstract：Delta sand body was one of the most important reservoir types for oil and gas exploration,and the lacustrine delta type was basically a river-dominated delta. To figure out the development mechanism,migration law,distribution characteristics and combination structure of sand body in river-dominated delta not only has scientific significance,but also has implications for oil and gas exploration. There are many factors affecting the river-dominated delta sand bodies. Tectonic activities control the type,formation and evolution of the basin,as well as the form of the sedimentary bottom type,the slope and the sediment source in a macroscale. In the relatively tectonic stable period,the sand body of a river-dominated delta was mainly controlled by three factors: The supply rate of the source(the source),the sedimentary bottom slope(slope)and the position of the lakeshore line(shoreline). The scale of the sand body was controlled by the supply capacity of the source,which was reflected in grain size,sand body thickness and distribution range;the sedimentary bottom slope controls the ratio of width to length,and was demonstrated by the angle of the front layer and the delta shape;The estuaries of the lakeshore were the main unloading areas of the sediments,and therefore,the position and the migration amplitude of the shoreline control the unloading position and continuity of the sand body. Different combinations of three factors lead to the different types and distribution pattern of delta sand bodies.
Li Yuan-Hao,Song Fang-Xin,Han Peng et al. A ternary sand control model of river-dominated delta in tectonic stability period[J]. JOPC, 2019, 21(3): 397-406.
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