四川盆地震旦系-下古生界沥青产烃潜力及分布特征

DISTRIBUTION CHARACTERS AND HYDROCARBON-GENERATING POTENTIAL OF BITUMEN OF SINIAN-LOWER PALEOZOIC IN SICHUAN BASIN

张林 魏国齐 吴世祥 汪泽成 肖贤明 张培军 沈珏红

Zhang Lin Wei Guoqi Wu Shixiang Wang Zecheng Xiao Xianming Zhang Peijun Sheng Juehong

中国矿业大学, 江苏, 徐州, 221008 2. 石油勘探开发科学研究院廊坊分院, 河北, 廊坊, 065007 3. 中科院广州地球化学研究所, 广州, 510640 4. 西南油气田分公司开发事业部, 成都, 610051

China University of Mining and Technology, Xuzhou, Jiangsu 221008, China 2. Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang, Hebei 065007, China 3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 4. Department of Development, Branch of Southwest Oil and Gas Field, Chengdu 610051, China

从分类、成因、分布、生烃能力及主生气期等方面对四川盆地震旦系-下古生界的沥青进行了系统分析.主要分布在泥页岩中的原生-同层沥青和在碳酸盐岩储集层中的后生-储层沥青,按全岩光片形态及光性特征可分为5种类型.在层系上以灯影组沥青含量较丰富,在区带上以乐山-龙女寺古隆起分布多,从坳陷带(0.41%)、斜坡带(0.93%～1.13%)、隆起部(2.4%～5.41%)沥青含量逐渐升高;沥青在古风化面含量最高,向下沥青含量相对降低.震旦系灯影组沥青形成于中侏罗世,主生气在早白垩世,晚于干酪根,生烃能力强力,可形成中型气田规模.

This paper systematically studies the sort,origin,distribution,capability of hydrocarbon-generating,and main gas-generating times of the bitumen of Sinian-Lower Paleozoic in Sichuan basin.Based on the whole rock polished surfaces configuration and optical characteristic,the bitumen is sorted five types.It has two origin kinds,one is original-in the bed bitumen which mostly distributed in the dark mudstone,fine sandy mudstone,the other is secondary-reservoir bitumen which mostly distributed in the carbonate reservoir rock.Bitumen distributed widely in Dengying formation,its content is higher,from depression (where account for 0.41%)to slope (0.93%～1.13%)and to uplift (2.4%～5.41%),which means higher content in Leshang-Longnusi Paleo-uplift.The Bitumen has high content in weathering zone and become less far from the zone.The Bitumen of Dengying formation of Sinian forms in middle Jurassic,its the main gas-generating time is early Cretaceous which is later than koregen.The Bitumen has strong capability of hydrocarbon-generating which can accumulate to middle gas field.

“九五”国家重点科技攻关项目(99-110-02-03).

https://doi.org/10.11781/sysydz200503276