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流体动力势对于烃类圈闭的分配、相态、渗漏和运移是很关键的。该分类体系把这两种属性盖层(静态的和动态的)与5类封闭和渗漏方式(毛细管封闭、压力封闭、水阻力封闭、水驱渗漏和水压破裂渗漏)以及两种烃类运进/出圈闭机制(充填/溢出和充填/渗漏)结合了起来。静态的盖层如厚层泥岩通常更多的是使圈闭在垂向上封闭,是临界孔喉毛细管力作用的结果(毛细管封闭)。在两相烃类系统中,充填/溢出趋向于聚集气。水力破裂通常需要静态盖层产生渗漏。而充填/渗漏则趋于聚集油。非均质砂/泥岩层和断层等动态盖层比静态盖层的封闭能力小,但分布广泛。它们强烈地受流体动力学性质的影响,受毛细管力的影响较小,对于封闭层(压力封闭)或者渗漏和重分布作用(水驱渗漏),水势是很重要的。水动力阻挡封闭对于液态烃类圈闭是重要的,而对于含气(充填/渗漏)的油藏是很关键的。
Hydrodynamic potential is critical to the distribution, phase state, seepage and migration of hydrocarbon traps. The classification system combines these two attributes of caprock (static and dynamic) with five types of sealing and leakage methods (capillary closure, pressure closure, water resistance closure, water drive leakage and hydraulic fracture leakage) and two Hydrocarbon transport / trapping mechanisms (Fill / Spill and Fill / Leak) are combined. Static capping, such as thick mudstone, is usually more of a vertical seal, as a result of the capillary action of the critical pore throat (capillary closure). In two-phase hydrocarbon systems, packing / spilling tends to accumulate gas. Hydraulic fracturing usually requires static capping to create leakage. Filling / seepage tends to aggregate the oil. Dynamic caprocks, such as heterogeneous sand / mudstone layers and faults, have a smaller, but more widespread, closure than static caprocks. They are strongly influenced by the hydrodynamic properties and are less influenced by the capillary forces, and the water potential is important for the closure (pressure containment) or for seepage and redistribution (water drive seepage). Hydrodynamic barrier closure is important for liquid hydrocarbon traps, but is crucial for gas-bearing (fill / seepage) reservoirs.