Organic matter (OM) is intimately associated with minerals in clay-rich mudstones, leading to widespread organic-mineral interaction during hydrocarbon generation in argillaceous source rocks. What we are concerned is the effects of the different mineral properties on hydrocarbon generation process and mechanism during mineral transformation. In this way, pyrolysis experiments with smectite-octadecanoic acid complexes (Sm-OA and Ex-Sm-OA) were conducted to analyze correlation of mineralogy and pyrolysis behaviors. Based on organic-mineral interaction, hydrocarbon generation process was divided into three phases. At 200–300 ​°C, collapse of smectite led to desorption of OM, resulting in high yield of resin and slight increase in saturates. Subsequently, enhanced smectite illitization at 350–450 ​°C was accompanied with large amounts of saturates and a mere gaseous hydrocarbon. Featured by neoformed plagioclase, ankerite, and illite, 500 ​°C saw plenty of asphaltene and methane-rich gaseous hydrocarbons, revealing cracking reactions of OM. Noteworthy is that saturated and gaseous hydrocarbons in Ex-Sm-OA were considerably more than that in Sm-OA during second and third phases. Quantitative calculation of hydrogen revealed organic hydrogen provided by cross-linking of OM could not balance hydrogen consumed by cracking reactions, but supply of inorganic hydrogen ensured cracking could readily occur and consequently greatly promoted hydrocarbon generation. Further investigating characteristics of mineralogy and pyrolytic products, as well as effects of solid acidity on hydrocarbon generation, we concluded desorption of OM and decarboxylation promoted by Lewis acid were dominated at 200–300 ​°C, resulting in low-degree hydrocarbon generation. While high yield of saturated and gaseous hydrocarbons in second and third phases, together with occurrence of ankerite, indicated predominance of decarboxylation and hydrogenation promoted by Lewis and Brønsted acid, respectively. Variations in organic-mineral interactions indicated (1) the controls of mineral transformation on hydrocarbon generation process and mechanism include desorption, decarboxylation, and hydrogenation reactions; (2) clay minerals acted as reactants evolving together with OM rather than catalysts. These findings are profoundly significant for understanding the hydrocarbon generation mechanisms, organic-inorganic interactions, and carbon cycle.

有机质（OM）与富含粘土的泥岩中的矿物密切相关，导致在泥质烃源岩中生烃过程中广泛的有机矿物相互作用。我们关注的是不同矿物特性对矿物转化过程中烃生成过程和机理的影响。通过这种方法，进行了蒙脱石-十八碳烯酸配合物（Sm-OA和Ex-Sm-OA）的热解实验，以分析矿物学和热解行为之间的关系。基于有机矿物相互作用，生烃过程分为三个阶段。在200-300°C下，蒙脱石的坍塌导致OM的解吸，从而导致树脂的高收率和饱和度的轻微增加。后来，蒙脱石在350-450°C时的强化作用增强，同时伴随着大量的饱和物和仅气态的碳氢化合物。500°C以新形成的斜长石，铁长石和伊利石为特征，可见大量的沥青质和富含甲烷的气态烃，揭示了OM的裂解反应。值得注意的是，Ex-Sm-OA中的饱和气态烃比第二和第三阶段中的Sm-OA气态烃多得多。氢的定量计算表明，OM交联提供的有机氢不能平衡裂解反应所消耗的氢，但无机氢的供应确保了裂解的发生，因此大大促进了烃的产生。进一步研究矿物学和热解产物的特性，以及固体酸度对烃生成的影响，我们得出结论，在200–300°C下，路易斯酸促进的OM解吸和脱羧作用占主导地位，导致烃的低度生成。尽管第二和第三相中饱和烃和气态烃的收率高，再加上马来石的出现，分别表明路易斯和布朗斯台德酸促进了脱羧和氢化作用的发展。有机-矿物相互作用的变化表明：（1）矿物转化对烃生成过程和机理的控制包括解吸，脱羧和加氢反应；（2）粘土矿物是与OM一起进化的反应物，而不是催化剂。这些发现对于理解碳氢化合物的生成机理，有机-无机相互作用和碳循环具有非常重要的意义。