海相不同类型烃源岩生排烃模式研究

MODELS OF HYDROCARBON GENERATION AND EXPULSION FROM VARIOUS MARINE SOURCE ROCKS

秦建中 刘宝泉

Qin Jianzhong Liu Baoquan

中国石化, 勘探开发研究院无锡实验地质研究所, 江苏, 无锡, 214151 2. 中国石油, 华北油田分公司, 勘探开发研究院, 河北, 任丘, 062552

Wuxi Research Institute of Experimental Petroleam Geology, SINOPEC, Wuxi, Jiangsu 214151, China 2. Huabei Oil Field Exploration & Development Institute, Renqiu, Hebei 062552, China

在海相烃源岩研究的基础上,筛选出青藏高原中生界和冀北地区上元古界未成熟—成熟海相不同类型烃源岩 10 个样品为代表,进行热压模拟试验,创建了海相3种类型干酪根和4种主要岩类的17种原始和再次生排烃模式。提出了海相烃源岩从Ⅰ型干酪根到Ⅱ1型到Ⅱ2型再到固体沥青,生排油、烃气和总生烃量逐渐变低,油质逐渐变轻,气逐渐变干,生烃速率也逐渐减小;从富烃页岩到富烃泥灰岩到富烃灰岩再到固体沥青,排油效率逐渐增加,总生排烃量和生烃速率具有逐渐减少的趋势,生烃气占总烃比例则从固体沥青到富烃页岩到泥灰岩到灰岩逐渐增加;从海相富烃源岩到低有机质含量的碳酸盐岩或随着有机质丰度的降低(TOC 0.2%到1.0%),生排油、烃气量和总生烃量及生烃速率逐渐变小,生烃气占总烃比例逐渐增加。

The 17 models of original and secondary hydrocarbon generation and expulsion from marine source rocks have been established. The work has been done on the basis of the thermal-pressure simulated experiment on ten samples selected from Mesozoic marine source rocks in the Qinghai-Xizang Plateau, and the Proterozoic marine source rocks in Jibei. The total hydrocarbon quantity, as well as the ratio of hydrocarbon generation, generated from kerogen in marine source rocks decreases gradually from type Ⅰ to Ⅱ1, Ⅱ2 kerogen and solid bitumen. At the same time, the oil quality becomes lighter and lighter, and the gas drier and drier. The efficiency of oil expulsion increases gradually from hydrocarbon-rich shale to marlite, limestone and solid bitumen. Both the total quantity and the ratio of hydrocarbon generation from them show a downward trend. The oil-gas ratio in total hydrocarbon increases gradually from solid bitumen to hydrocarbon-rich shale, marlite and limestone. The quantity of oil-gas generation and expulsion, the total quantity and the ratio of hydrocarbon generation decrease gradually, but the oil-gas ratio in total hydrocarbon increases with the reduction of the content of organic matter in the marine source rock(TOC=0.2%-1.0%).

中国石化科技攻关项目(P02089)。

https://doi.org/10.11781/sysydz200501074