成岩作用对储层物性的利弊影响分析

Advantages and Disadvantages Effects of Diagenesis on Reservoir Physical Properties

摘要: 与传统理论相比，成岩作用类型并不能截然地分为对储层影响利弊的两大类，事实上，无论是各类成岩作用本身还是它们的组合，对储层物性影响皆具有两面性。本文以乌南油田储层成岩作用发育类型为例，通过岩心观察、普通薄片、铸体薄片鉴定以及扫描电镜检测等方法详细观察总结了主要成岩作用类型发育特征，并结合辩证法的理论深入探讨了储层成岩作用对其物性的辩证影响。结果表明压实、胶结、交代、溶解、重结晶等主要成岩作用类型的自身或组合对物性影响具有普遍的两面性、复杂性和相互联系，具体表现为对于储层的改善和破坏相互依存和相互转化。本着趋利避害寻找优质储层的原则，如果压实、胶结、交代作用在成岩早期阶段相对发育，溶解作用在成岩后期阶段更为发育，皆有利于储层物性的最终改善。

Abstract: Compared with the traditional theory, the diagenesis types cannot be divided into two categories completely. In fact, both the diagenesis itself and its combination have two sides. In this paper, the diagenesis of the W oil field is taken as an example, and the main diagenesis types are summarized by the methods of observing cores, identifing common and casting thin sections, and detecting scanning electron microscope. And the dialectic influence of diagenesis on the physical properties of reservoirs is discussed in the light of the theory of dialectics. The results show that the main diagenetic types, such as compaction, cementation, dissolution, recrystallization, their own or their combination, have a common duality, complexity and interrelated influence on the physical properties. They are characterized by interdependence and mutual transformation of reservoir improvement and destruction. In line with the advantages and disadvantages to find the principle of high-quality reservoirs, it is conducive to the ultimate improvement of reservoir physical properties if the compaction, cementation and metasomatism are relatively developed in the early stage of diagenesis as well as the dissolution is more developed in the later stage of diagenesis.