Diagenetic modeling to assess the relative timing of quartz cementation and brittle grain processes during compaction
Diagenetic modeling to assess the relative timing of quartz cementation and brittle grain processes during compaction
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DOI：
10.1306/12190505044
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发表时间：
2006-06
期刊：
影响因子：
3.5
通讯作者：
Astrid Makowitz;R. H. Lander;K. Milliken
中科院分区：
文献类型：
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作者：
Astrid Makowitz;R. H. Lander;K. Milliken
本研究介绍了孔隙度减少脆性变形和试金石砂岩成岩作用建模软件的应用程序，以评估埋藏压实过程中颗粒断裂和水泥形成之间的相对时间和相互作用。从以前的研究中使用的两个例子的压实压裂：渐新世弗里奥形成，墨西哥湾盆地，和寒武纪西蒙山形成，伊利诺伊州盆地，美国。压实过程中的颗粒断裂产生了颗粒内断裂表面，与可能带有抑制石英水泥成核和生长的涂层的外部颗粒表面相比，颗粒内断裂表面是石英成核的有利位点。因此，在成岩作用过程中的脆性断裂过程的进展影响石英胶结作用。反过来，石英胶结过程的建模可以用于将压裂置于埋藏史的适当背景中。在西蒙山组中，石英颗粒的脆性变形程度与石英胶结作用开始时的重建有效应力相关。然而，对于弗里奥组样品，脆性变形的程度不相关，以及重建的有效应力使用一维盆地模型，使用压实不平衡作为超压生成的主导机制。从所观察到的颗粒破裂程度来看，在我们的盆地模型所指示的浅深度处，Frio可能没有形成显著的流体超压。砂岩中的压实破裂程度构成了可用于解释压力历史复杂性的可观察证据。
This study describes porosity reduction by brittle deformation and the application of Touchstone sandstone diagenesis modeling software to assess the relative timing and interactions between grain fracturing and cement formation during burial compaction. Two examples from a previous study of compactional fracturing are used: the Oligocene Frio Formation, Gulf of Mexico Basin, and the Cambrian Mount Simon Formation, Illinois Basin, United States. Grain fracturing during compaction creates intragranular fracture surfaces that are favorable sites for quartz nucleation compared to external grain surfaces that may bear coatings that inhibit the nucleation and growth of quartz cement. Thus, the progress of brittle fracture processes during diagenesis affects quartz cementation. In turn, modeling of the quartz cementation process can serve to place fracturing into its proper context in burial history. In the Mount Simon Formation, the extent of brittle deformation of quartz grains correlates with reconstructed effective stress at the onset of quartz cementation. For Frio Formation samples, however, the extent of brittle deformation does not correlate well with reconstructed effective stress obtained using a one-dimensional basin model that uses compaction disequilibrium as the dominant mechanism for overpressure generation. Judging from the observed degree of grain fracturing, significant fluid overpressures in the Frio may not have developed at the shallow depths indicated by our basin models. The degree of compactional fracturing in sandstones constitutes observable evidence that can be used to decipher the complexities of pressure history.