| 摘要: |
| 通过对额济纳旗及其邻区石炭纪—二叠纪盆地基底结构构造和石炭系—二叠系岩石地层特征、沉积演化、沉积相平面展布特征的研究，认为该区石炭纪—二叠纪为统一的裂谷盆地。盆地早石炭世—早二叠世早期为由北向南的上超沉积，早二叠世中期—晚二叠世为由南向北的下超沉积，晚石炭世—早二叠世阿木山期为盆地演化的鼎盛时期，以浅海陆棚相沉积为主；在烃源岩分布、有机质丰度、干酪根类型和烃源岩演化特征研究的基础上，指出广泛发育的浅海陆棚相泥页岩具有良好的生烃条件，发育多套厚度较大、有机碳（TOC）含量中等—较高、以Ⅱ类干酪根为主的烃源岩。烃源岩演化主要受埋藏史的影响，以成熟—高成熟为主。局部地区受华力西末期—燕山期侵入岩热接触的影响，或构造改造强烈的区带受构造动力变质作用的影响，烃源岩演化达到过成熟。 |
| 关键词: 额济纳旗及其邻区 石炭系—二叠系 裂谷盆地 烃源岩 油气资源前景 |
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| Carboniferous-Permian sedimentary formation and hydrocarbon generation conditions in Ejin Banner and its vicinities, western Inner Mongolia: a study of Carboniferous-Permian petroleum geological conditions (part 1) |
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LU Jin-cai, CHEN Gao-chao, WEI Xian-yang, LI Yu-hong, WEI Jian-she
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Xi′an Center of Geological Survey, China Geological Survey, Xi′an 710054, Shaanxi, China
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| Abstract: |
| Based on a study of the characteristics of Carboniferous-Permian basin basement structure, lithostratigraphy, sedimentary evolution and planar sedimentary facies, the authors consider that the Carboniferous-Permian basin of Ejin Banner and its vicinities is a uniform rift basin: there existed onlap sedimentation from north to south during Early Carboniferous-early Early Permian period and onlap sedimentation from south to north at the middle stage of Early Permian- Early Permian period, and the basin evolution reached its climax in Amushan stage of Late Carboniferous- Early Permian period, with the sediments being mainly of shallow sea shelf facies. Based on a study of the distribution of hydrocarbon source rocks, organic matter abundance, kerogen type and hydrocarbon source rock evolution, it is considered that widespread shallow sea- continental shelf argillutite has good conditions for hydrocarbon generation. There are several sets of hydrocarbon source rocks characterized by large thickness, middle-higher content of TOC and II type kerogen. The evolution has mainly been affected by burial history, and the hydrocarbon source rocks are of the mature-high mature stage. Controlled by thermal contact of Yanshanian intrusive rock and tectonic dynamometamorphism in the strongly tectonic reworking belt, the hydrocarbon source rocks of the northern study area was once reached the mature stage. |
| Key words: Ejin Banner and its vicinities Carboniferous-Permian rift basin hydrocarbon source rocks petroleum resource potential |