Geological modeling of braided river reservoir based on genesis and evolution: a case study on block M in Orinoco Heavy Oil Belt,Venezuela
CHEN Shizhen1,2, Lin Chengyan1,2, REN Lihua1,2, ZHANG Xianguo1,2, HUANG Wensong3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Reservoir Geology Key Laboratory of Shandong Province, Qingdao, Shandong 266580, China; 3. Research Institute of Petroleum Exploration Development, PetroChina, Beijing 100083, China
Abstract：The Orinoco Heavy Oil Belt in Venezuela is the largest heavy oil accumulation area in the world.It is rich in geological reserves and has a huge exploitation potential.However,because the primary oil pay zone in the area is almost fluvial deposits of sandy braided river,it is characterized by laterally fast facies change and vertically complex superimposition of sand bodies,resulting in serious heterogeneity inside the reservoir,and restricting the following production and the implementation of the development plan.Taking the lower Oficina formation in block M as a case,according to the cores,well logging and seismic data,four main genetic units were identified and summarized including compound bars,braided channels,abandoned channels and residual floodplain mudstone.Under the gui-dance of a sedimentary conceptual model,the strata slicing method was used to extract and analyze the evolution process of the genetic units over time.This information extracted was transformed into a probability volume to control the geological modeling process.Taking the identified results of horizontal and vertical wells as hard data,a final geological model controlled by genesis and evolution information was established under the constraint of the probability volume.The drill-in rate by horizontal wells has been increased to more than 95% after the model was applied in field operation,indicating a good application effect.
陈仕臻, 林承焰, 任丽华, 张宪国, 黄文松. 成因与演化信息约束的辫状河储层地质建模——以委内瑞拉奥里诺科重油带M区块为例[J]. 石油地球物理勘探, 2020, 55(5): 1092-1101.
CHEN Shizhen, Lin Chengyan, REN Lihua, ZHANG Xianguo, HUANG Wensong. Geological modeling of braided river reservoir based on genesis and evolution: a case study on block M in Orinoco Heavy Oil Belt,Venezuela. Oil Geophysical Prospecting, 2020, 55(5): 1092-1101.
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