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通过陆上和海洋22口探井的215个岩心和岩屑样品的详细研究,建立了波弗特—马更些盆地的伊/蒙(I/S)混层粘土埋藏—成岩作用演化趋势。 波弗特—马更些盆地的伊利石化作用具有四种类型的I/S混层特征:无序、无序和有序混层、R1型有序以及R>1型有序I/S混层。伊利石层的比例一般随深度增加,而I/S混层的主要类型从无序向R>1型有序转变。在无序I/S混层段内伊利石含量增加很快,并随深度呈抛物线性变化趋势,而在有序I/S混层则增加缓慢并呈线性变化趋势。 温度似乎是伊利石化反应的重要控制因素,而超压、岩性及其他地质因素明显对I/S组成的局部变化产生影响。伊利石化反应开始的门限温度高于50℃。从无序向R1型有序转化,从R1型向R>1型有序转化发生的温度分别是70°—110℃和110°—140℃。 超压带和砂岩段内的伊利石化程度比正常压力段和页岩段更高。与正常压力环境相比,超压环境下I/S混层的快速成岩作用,可能与其较高的水/岩比率有关。同理可以解释砂岩段的情况,因为砂岩具有较高的孔隙度和渗透率。 波弗特—马更些盆地的油气分布似乎与I/S成岩作用有关。油气藏位于无序I/S混层段内伊利石化活跃带之上或顶部,而极少位于有序I/S混层出现的深度之下。来自I/S成岩作用的蒙皂石水在油气的富集过程中起着重要的作用。
Based on the detailed study of 215 cores and debris samples from 22 exploration wells onshore and offshore, the evolution trend of I / S mixed clay burial-diagenesis in the Beaufort-Maakeye Basin was established. The Erie Petrochemicals in the Beaufort-Maakei Basin have four types of I / S mixed-layer features: unordered, disordered and ordered mixed layers, R1 type order, and R> 1 type ordered I / S mix Floor. The proportion of illite strata generally increases with depth, while the major type of I / S strata shifts from disorder to R> 1 orderly. The illite content increases rapidly in the disordered I / S mixed layer, and shows a parabolic trend with depth. In the ordered I / S mixed layer, the content increases slowly and linearly. Temperature seems to be an important controlling factor in the illite reactions, and overpressure, lithology and other geologic factors significantly affect the local changes in I / S composition. The threshold temperature at which Erie’s petrochemical reaction begins is above 50 ° C. The orderly transformation from disordered to R1 is 70 ° -110 ° C and 110 ° -140 ° C, respectively, for the orderly conversion from R1 to R> 1. The Erie petrochemical overpressure zone and sandstone is higher than normal pressure and shale. Compared with normal pressure environment, the rapid diagenesis of I / S mixed layer under overpressure may be related to its higher water / rock ratio. The same can explain the situation of sandstone, sandstone because of high porosity and permeability. The hydrocarbon distribution in the Beaufort-Maakeizi basin seems to be related to I / S diagenesis. The reservoirs are located above or at the top of the illite active zone within the disordered I / S mixed interval and rarely below the depth at which the ordered I / S mixed layer occurs. Smectite water from I / S diagenesis plays an important role in hydrocarbon enrichment.