川西北矿山梁地区沥青脉地球化学特征及其意义  

Geochemical characteristics of bituminous dike in Kuangshanliang area of the Northwestern Sichuan Basin and its significance

作　　者：黄第藩[1] 王兰生[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田分公司勘探开发研究院,四川成都610051

出　　处：《石油学报》2008年第1期23-28,共6页Acta Petrolei Sinica

摘　　要：四川盆地西北部龙门山北段东缘矿山梁地区受海西构造运动中产生的断裂和裂缝系统的控制,在矿山梁和碾子坝构造上的寒武系、奥陶系和志留系地层之中分布着众多的沥青脉,是我国和世界上最古老的沥青脉之一。在野外考察的基础上,对沥青脉抽提物的饱和烃和芳烃中沥青分子地球化学特征进行的研究发现,其分子化合物的组成具有某些独特之处,这可能是由于沥青脉源于震旦—寒武系古油藏,当时只有藻类和细菌生源,沥青脉属于热蚀变沥青,形成后经历了长期演化。同时,矿山梁和碾子坝分布的沥青脉也指示在龙门山褶皱带东缘找寻我国最古老的震旦—寒武系油田的良好前景。Kuangshanliang region is controlled by fault and fracture system caused by Hercynian tectonic movement in the east margin of northern Longmen Mountain of Sichuan Basin. The bituminous dikes are originated from Sinian-Cambrian ancient oil reservoir and distributed in the Cambrian, Ordovician and Silurian of Kuangshanliang and Nianzi dam structures. The bituminous dikes belong to the thermally altered bitumen and are the oldest bituminous dikes in the world. The field survey to the bituminous dikes and the molecular geochemical research of saturated and aromatic hydrocarbon within bitumen extractable organic matter shows that the molecular compounds of bitumen bear unique feature and noticeable, because the bituminous dikes were originated from Sinian-Cambrian （only algae and bacteria） ancient oil reservoir suffered long-term evolution afterwards. At the same time, the bituminous dikes also indicate the favorable foregrounds for exploration of Sinian-Cambrian oilfield in the east margin of fold belt of Longmen Mountain.

关 键 词：四川盆地 矿山梁地区 沥青脉 分子有机地球化学特征 震旦—寒武系古油藏 热蚀变沥青 

分 类 号：TE125.6[石油与天然气工程—油气勘探]