阿根廷neuquacimassn盆地Vaca Muerta组裂缝性、组成、岩石组构与储层物性的关系:从露头到地下岩心数据

IF 0.9 4区 地球科学 Q3 GEOLOGY
L. Martín, D. Marchal, S. Barredo, C. Naides, Silvia Blanco
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引用次数: 4

摘要

裂变性是指一些岩石沿着平行于层理的相对光滑的表面分裂的能力。这种性质主要在细粒岩石中观察到,特别是在露头中表现出来,那里的岩石受到风化作用。大多数作者将可裂变性与粘土矿物的丰度及其与层理平行的取向联系起来。沉积物组成、总有机碳含量(TOC)和沉积机制等沉积条件可促进水平组构,形成原生裂变。另外,板状矿物的排列可以通过机械压实或次生矿物生长等过程与岩石的埋藏历史联系起来,从而导致次生裂变。本研究旨在从微观和宏观尺度上确定Cerro Mulichinco地区Vaca Muerta组岩石和neuqusamin盆地一口井中提取的121米长的岩心中裂变发育的主要控制因素。露头中,易裂性与碳酸盐含量低的细粒层状相有关,表明岩性对其控制作用较强。TOC测量允许建立有机质含量和裂变强度之间的正相关关系。此外,海侵—海退旋回分析表明,在最大淹没面附近,裂解性较高。根据其力学特性,岩心内观察到的不同界面分为一级和二级,二级包括裂变面。其中一些界面随着岩心提取过程中应力条件的变化以及提取后数周(T1)、数月(T2)和数年(T3)应力的弛缓而从潜在(部分打开)不连续演变为有效(完全打开)不连续。有效岩心不连续面的时间演化表明,岩石层段是可变破碎的,岩心段是完整的。干燥酒精不连续(DAD)方法揭示了在表面完整的岩心段内潜在的不连续。利用这一技术,建立了一个4级指标作为裂变度的代理指标。当与地质、岩石物理和地质力学数据相结合时,该指标可以表征控制岩石分裂的主要机制,这些机制通过不连续面来表达,从而促进岩石的能力丧失。因此,在页岩储层完井中,这一力学性质会影响水力裂缝的效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Relationship between fissility, composition, rock fabric and reservoir properties in Vaca Muerta Formation (Neuquén Basin, Argentina): from outcrop to subsurface core data
The fissility is the ability of some rocks to split along relatively smooth surfaces parallel to the bedding. This property observed mostly in fine-grained rocks is particularly expressed in outcrops, where rocks are subjected to weathering processes. Most authors associate the fissility to the abundance of clay minerals and their orientation parallel to the bedding. The horizontal fabric can be promoted by depositional conditions such as sediment composition, quantity of total organic carbon content (TOC) and depositional mechanisms, giving rise to a primary fissility. Alternatively, the alignment of platy minerals can be linked to the burial history of the rock, by processes such as mechanical compaction or secondary mineral growth, resulting in a secondary fissility. The present study aims to identify the main controls of fissility development at the micro- and macroscopic scale in rocks of the Vaca Muerta Formation exposed in the Cerro Mulichinco area and in a 121-meter-long core extracted from a well within the Neuquén Basin. In outcrops, fissility is related to fine-grained laminated facies with low carbonate content, revealing the strong control exerted by lithology. The TOC measurements allow establishing a positive correlation between organic matter content and fissility intensity. Moreover, the analysis of the transgressive-regressive cycles shows that fissility is higher around the maximum flooding surfaces. Regarding their mechanical characteristics, the different interfaces observed in core are classified into first and second-order, the last one including fissility planes. Some of these interfaces evolve from potential (partially open) to effective (totally open) discontinuities in response to changes of stress conditions during the core extraction and due to the stress relaxation through time: weeks (T1), months (T2) and years (T3) after extraction. The time evolution of the effective core discontinuities points out rock intervals that are variably broken and core segments that remain intact. The Drying Alcohol Discontinuities (DAD) methodology reveals potential discontinuities within apparently intact core segments. By using this technique, a 4-class index is established as a proxy for fissility degree. When integrated with geological, petrophysical and geomechanical data, this index enables characterizing the main mechanisms controlling rock fissility that express through discontinuities promoting the loss of competence of a rock. Consequently, this mechanical property is considered to influence the efficiency of hydraulic fracture in shale reservoir completion.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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