本文關(guān)鍵詞： 生排烴模擬 PVT-L共控 紅外光譜 烴源巖　出處：《石油實(shí)驗(yàn)地質(zhì)》2017年01期 　論文類型：期刊論文

【摘要】：烴源巖的生烴過程是在地層孔隙空間內(nèi)有機(jī)質(zhì)受溫度、上覆巖層靜巖壓力和高地層流體壓力(PVT-L共控)等多種作用下的一種復(fù)雜的物理化學(xué)反應(yīng)過程。然而目前常用的生烴模擬實(shí)驗(yàn)(高壓釜加水生烴模擬)大多是在一個(gè)低流體壓力、無靜巖壓力、相對(duì)較大的生烴空間下進(jìn)行的,與實(shí)際地質(zhì)情況差異較大。選用南襄盆地泌陽凹陷核三段未熟泥巖分別開展了PVT-L共控和常規(guī)高壓釜方式加水模擬實(shí)驗(yàn),不同演化階段干酪根的傅里葉變換紅外光譜對(duì)比分析表明:(1)伴隨著脂族結(jié)構(gòu)裂解、含氧基團(tuán)脫落及芳香結(jié)構(gòu)縮合,干酪根演化明顯呈現(xiàn)出緩慢生油、快速生油和結(jié)束生油3個(gè)階段;(2)脂肪度參數(shù)IAL、飽芳比參數(shù)IL/R和含氧度參數(shù)IO表明,同等溫度條件下常規(guī)高壓釜加水模擬脂肪鏈和含氧基團(tuán)的熱裂解反應(yīng)更為劇烈,PVT-L共控模擬則相對(duì)平緩,380℃時(shí)仍伴隨有較強(qiáng)的生烴能力;(3)PVT-L共控模擬條件下飽和烴的芳構(gòu)化程度更低,可能與其限定空間內(nèi)較高的流體壓力有關(guān);(4)含氧度在成熟中期間歇的輕微增大,暗示水對(duì)干酪根生烴過程也許有重要的作用。2種不同模擬方式下干酪根紅外光譜特征上的差別,暗示其在生烴反應(yīng)機(jī)理上存在較大差異,在熱模擬實(shí)驗(yàn)研究中要根據(jù)研究目的合理選擇模擬方式,設(shè)置實(shí)驗(yàn)條件。
[Abstract]:The hydrocarbon generation process of source rocks is that the organic matter is heated in the pore space of strata. There is a complicated physicochemical reaction process under the action of static rock pressure and high formation fluid pressure (PVT-L co-control) in overlying strata. However, most of the commonly used hydrocarbon-generating simulation experiments (hydrocarbon-generating simulation in autoclave) are at a low fluid pressure. In the absence of static rock pressure and relatively large hydrocarbon generation space, it is quite different from the actual geological conditions. PVT-L co-control and conventional autoclave water addition simulation experiments were carried out in the unripe mudstone of the third member of the Miyang Depression in Nanxiang Basin. Fourier transform infrared spectroscopy (FTIR) analysis of kerogen at different stages of evolution showed that the evolution of kerogen showed slow oil generation, which was accompanied by the decomposition of lipids, the exfoliation of oxygenated groups and the condensation of aromatic structures, and the evolution of kerogen was characterized by slow oil generation. The three stages of rapid oil generation and ending oil generation, I. e., IL/R, IL/R and oxygen content, showed that the parameters of fat degree, satiety ratio, and oxygen content of the three stages of oil generation were as follows:. At the same temperature, the conventional autoclave with water to simulate the pyrolysis reaction of fat chain and oxygen-containing group is more intense than PVT-L co-control simulation, but it is still accompanied by a strong hydrocarbon generating ability and saturated hydrocarbon under the condition of co-controlled simulation at 380 鈩，

本文編號(hào)：1517995