松辽盆地长岭断陷层烃源岩地球化学特征研究

GEOCHEMICAL CHARACTERISTICS OF SOURCE ROCKS IN CHANGLING FAULT DEPRESSION, SONGLIAO BASIN

周卓明 王再锋 伍泓

Zhou Zhuoming Wang Zaifeng Wu Hong

成都理工大学, 能源学院, 成都, 610059 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151

School of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China 2. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

下白垩统沙河子组沉积的暗色泥岩和煤层是松辽盆地长岭断陷层主要的烃源岩,火石岭组和营城组为次要烃源岩。钻井和露头样品表明,火石岭组烃源岩有机碳含量0.50%~8.55%、生烃潜量2~17mg/g、氯仿沥青"A"含量0.04%~0.33%,干酪根类型以Ⅱ型为主,成熟度演化处于生气的过成熟阶段;沙河子组烃源岩有机碳含量1.00%~6.54%、生烃潜量2~8mg/g、氯仿沥青"A"含量0.2%~0.5%,干酪根类型以Ⅰ型和Ⅱ型为主,成熟度演化处于高成熟—过成熟阶段;营城组烃源岩有机碳含量0.5%~2.5%、生烃潜量0.5~4.0mg/g、氯仿沥青"A"含量0.05%~0.20%,干酪根类型以Ⅱ型为主,处于成熟—高成熟阶段。综合评价沙河子组为中等—好烃源岩,而营城组和火石岭组烃源岩属中等烃源岩。

The main source rocks of the Changling Fault Depression in the Songliao Basin are dark mudstone and coal seam deposited in the Lower Cretaceous Shahezi Formation.The Huoshiling and Yingcheng Formations are secondary source rocks.Analyses of well samples and outcrops show that,as to the Huoshiling Formation source rocks,organic carbon content is 0.50%-8.55%,hydrocarbon gene-ration potential is 2-17 mg/g,chloroform bitumen "A" content is 0.04%-0.33%,main kerogen type is Ⅱ,and it is during the over-mature stage of organic evolution.As to the Shahezi Formation source rocks,organic carbon content is 1.00%-6.54%,hydrocarbon generation potential is 2-8 mg/g,chloroform bitumen "A" content is 0.2%-0.5%,main kerogen types are Ⅰ and Ⅱ,and it is during the high-and over-mature stages of organic evolution.As to the Yingcheng Formation source rocks,organic carbon content is 0.5%-2.5%,hydrocarbon generation potential is 0.5-4.0 mg/g,chloroform bitumen "A" content is 0.05%-0.20%,main kerogen type is Ⅱ,and it is during the mature and high-mature stages of organic evolution.The Shahezi Formation source rocks are considered as moderate-good,while the Yingcheng and Huoshiling Formations are considered as moderate.

https://doi.org/10.11781/sysydz200906608