EFFECTS OF DIAGENESIS ON SHALE NANO-PORE STRUCTURE AND IMPLICATIONS FOR SEALING CAPACITY
EFFECTS OF DIAGENESIS ON SHALE NANO-PORE STRUCTURE AND IMPLICATIONS FOR SEALING CAPACITY
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DOI：
10.1180/claymin.1994.029.4.05
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发表时间：
1994-10-01
期刊：
影响因子：
1.5
通讯作者：
WILLIAMSON, MA
中科院分区：
文献类型：
--
作者：
KATSUBE, TJ;WILLIAMSON, MA
由于成岩作用对沉积盆地烃充注历史的模拟具有重要意义，因此正在研究成岩作用对页岩岩石物理特性的影响，作为页岩封闭能力研究的一部分。 迄今为止的结果表明，成岩作用（胶结和溶解程度）显著影响纳米孔（0.3-60 nm）的孔隙度和互连性，这些孔构成致密页岩的主要孔喉。 成岩作用导致致密页岩渗透率在超过一个数量级（10（-21）- 6 x 10（-20）m2）的范围内变化，孔隙度在1%和12%之间变化。 此外，成岩作用显著影响页岩纳米孔隙在压实和埋藏过程中的抗坍塌性，主要在深度> 2-3 km处，影响油气捕获、超压和封闭能力。 溶解倾向于延迟过量压力脉冲的时间，而胶结具有相反的效果。 在较浅的深度，成岩作用的重要性降低。
The effect of diagenesis on shale petrophysical characteristics is being investigated as part of a study on shale sealing capacity because of its significance for modelling hydrocarbon charge histories of sedimentary basins. Results to date indicate that diagenesis (degree of cementation and dissolution) significantly affects porosity and inter-connectivity of the nano-pores (0.3-60 nm), the pores constituting the main pore-throats for tight shales. Diagenesis causes tight shale permeabilities to vary over a range exceeding an order of magnitude (10(-21) - 6 x 10(-20) m2) and porosities to vary between 1 and 12%. In addition, diagenesis significantly influences shale nano-pore resistance to collapse during compaction and burial, mainly at depth > 2-3 km, affecting hydrocarbon trapping, overpressure and sealing capacities. Dissolution tends to delay the timing of excess pressure pulses, while cementation has a reverse effect. The significance of diagnesis is reduced at shallower depths.