Analysis of new fields for oil and gas exploration in mature exploration areas of continental rifted basins in eastern China
LIU Zhen1, ZHU Maolin1, LI Jin2, LIU Huimin3, WANG Xiaowen4, LIU Junbang5
1 College of Geosciences, China Universety of Petroleum(Beijing),Beijing 102249, China; 2 Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China; 3 Manage center of Oil and Gas Exploration,Shengli Oilfield Company,SINOPEC,Shandong Dongying 257017,China; 4 Exploration Department of Jidong Oilfield Company,PetroChina,Hebei Tangshan 063004,China; 5 Research Institute of Petroleum Exploration and Development,PetroChina, Beijing 100083, China;
Abstract:After more than 50 years of large-scale exploration and development,onshore oil and gas fields in eastern China have entered the middle and late stage of exploration. Due to the limitations of petroleum geological knowledge and exploration technology,the targets to be discovered are increasingly hidden,and the difficulty of oil and gas exploration is increasing day by day. In view of the limitations of evaluation methods for deep low-porosity and low-permeability tight sandstone reservoirs,the genetic models of deep glutenite reservoirs and the complexity of the formation and distribution of bedrock weathering crust in continental rifted basins in eastern China,the author has carried out systematic analysis and summary and made the following research progress: (1)Based on the dynamic principle of physical property evolution of sandstone reservoirs,a new idea and method for tight sandstone reservoirs dynamic evaluation are put forward and it is pointed out that low-porosity and permeability tight sandstones in deep sags with low evaluation in the past still have exploration potential;(2)Using the seismic stratigraphy method,the sedimentary model of oblique large fan deltas in the steep slope zone of rifted basins is established. It is suggested that the large-scale fan delta glutenites be favorable reservoirs in deep rifted basins and can be used as the next favorable exploration direction;(3)According to the new model of two-layer texture of bedrock weathering crusts and combined with the new dynamic model of weathering crust reservoir transformation-destruction-preservation mechanism,it is pointed out that the middle and low parts of the rifted basin are the most favorable zones for weathering crust reservoir development,and the inner gentle slope zone(subsag areas)of the rifted basin is also the favorable exploration zone for bedrock weathering crust reservoir. The above three new exploration fields proposed in this paper not only the supplement and develop the hydrocarbon accumulation models of rifted basins,but also show the great potential of conventional and unconventional oil and gas exploration in deep-layer rifted basins in eastern China,and point out a clear direction for deepening the oil and gas exploration in mature basins in eastern China.
LIU Zhen,ZHU Maolin,LI Jin et al. Analysis of new fields for oil and gas exploration in mature exploration areas of continental rifted basins in eastern China[J]. JOPC, 2022, 24(5): 871-893.
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