首页|A novel method for quantitatively identifying driving forces and evaluating their contributions to oil and gas accumulation
A novel method for quantitatively identifying driving forces and evaluating their contributions to oil and gas accumulation
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Different driving forces govern the formation of distinct types of oil and gas accumulation and yield diverse oil and gas distributions.Complex oil and gas reservoirs in basins are commonly formed by the combination of multiple forces.It is very difficult but essential to identify driving forces and evaluate their contributions in predicting the type and distribution of oil and gas reservoirs.In this study,a novel method is proposed to identify driving forces and evaluate their contribution based on the critical con-ditions of porosity and permeability corresponding to buoyancy-driven hydrocarbon accumulation depth(BHAD).The application of this method to the Nanpu Sag of the Bohai Bay Basin shows that all oil and gas accumulations in the reservoirs are jointly formed by four driving forces:buoyance(Ⅰ),non-buoyance(Ⅱ),tectonic stress(Ⅲ1)and geofluid activity(Ⅲ2).Their contributions to all proven reserves are approxi-mately 63.8％,16.2％,2.9％,and 17.0％,respectively.The contribution of the driving forces is related to the depth,distance to faults and unconformity surfaces.Buoyancy dominates the formation of conven-tional reservoirs above BHAD,non-buoyant dominate the formation of unconventional reservoirs below BHAD,tectonic stress dominates the formation of fractured reservoirs within 300 m of a fault,and geoflu-ids activity dominates the formation of vuggy reservoirs within 100 m of an unconformity surface.
Driving forcesDynamic mechanismsBuoyancy-driven hydrocarbonaccumulation depthUnconventional oil and gasResources evaluation
College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Chemical and Petroleum Engineering,Schulich School of Engineering,University of Calgary,Calgary T2N 1N4,Canada
State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China
Petroleum Exploration and Development Research Institute,CNPC,Beijing 100083,China
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National Natural Science Foundation of ChinaMechanism of Unconventional Oil and Gas Self-Sealing and Reservoir FormationState Key Basic Research ProgramState Key Basic Research Program
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