确定沉积岩成岩作用顺序的定量方法

本文从热力学基本定律出发，将复杂的成岩作用过程归结为各种不同的化学反应，从而建立了一套利用反应自由能定量确定成岩作用顺序的方法。该方法将沉积岩成岩作用历史研究从定性引向定量，使其更具理论依据，结果更可靠。利用本方法对国内外两个不同碎屑岩定量研究结果表明，这种方法获得的结果与传统方法的顺序完全一致，从而说明了该方法的良好实用性。

Quantitative Method of Determining Sedimentary Diagenetic Sequences

During sediments to be overlaid, a series of geological events occured. Especially when the underground water took partal, they become very complex. In these events, a large amount of minerals generated or converted and some minerals or elastics dissolved, which resulted in lots of secondary pores generation. It is not only important to improve the properties of reservior rock, but also to form diagenetic trap. Therefore, studying the complex diagenetic events is not only a Part of lithology and sedimentology, but also a part of Petroleum geology and reservior geology.In this paper, all of those geological events occured in underground environment assumed to be a series of physicochemical reactions.Those reactions alwayas follow Thermodynamic-Second Law and Third-Law. According to those assumptions, a method is derived which can be used to determine the diagenetic sequences by calculating the reaction Gibbs energy. The method is more logical and more reliable than the traditional method by which the sequences are determined use of identifying the concocts and shapes of secondary minerals. At last this method is verified by two examples which are from two models of oil fields (China and American). This poper presents a good demonstration for how to research reservior rock development history quantitatively.