塔北地区志留系沥青砂岩热模拟实验及其供烃意义

Thermal simulation of Silurian bituminous sandstone and its significance of hydrocarbon supply in northern Tarim Basin

黄继文 顾忆 陈强路 邵志兵

Huang Jiwen Gu Yi Chen Qianglu Shao Zhibing

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214126

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

采用人工样品与地质样品2套模拟实验方案,开展了塔北志留系沥青砂岩作为再生烃源的生烃潜力的模拟实验。综合人工样品与地质模拟实验中不同温度的产率、产物组成变化,志留系沥青砂岩作为再生烃源的演化可分为蒸发分馏排油气阶段(模拟温度100～300℃,相当于Ro<0.9%)、裂解油气生成排出阶段(模拟温度325～400℃,相当于Ro=0.9%～1.8%)、裂解生排气阶段(模拟温度大于400℃,相当于Ro>2.0%)3个不同的演化阶段。就塔北志留系沥青砂岩实际埋深及成熟度而言,能进入裂解油气生、排阶段的志留系沥青砂岩,现今埋深应在6000m以上的,主要分布于沙西—哈拉哈塘地区。资源量估算认为,塔北志留系沥青砂岩虽不足以形成大规模的油气聚集,但也是塔北地区重要的辅助性再生烃源。

To study the hydrocarbon generation potential of the Silurian bituminous sandstone in the northern Tarim Basin,two sets of experiment program were carried out using artificial and geologic samples respectively.According to the yielding rate and product composition under different experiment temperatures,the hydrocarbon generation process of the Silurian bituminous sandstone was divided into 3 stages including evaporative fractionation oil-and-gas expulsion stage(with the simulative temperature of 100-300℃,equivalent to Ro<0.9%),cracking oil-and-gas expulsion stage(with the simulative temperature of 325-400℃,equivalent to 0.9%2.0%).According to the actual depth and maturity of the Silurian bituminous sandstone in the northern Tarim Basin,those sandstones during the cracking oil-and-gas expulsion stage were buried over 6 000 m deep and mainly located in the western Shaya and Halahatang areas.Through resource estimation,although the bituminous sandstones could not provide enough hydrocarbons for accumulation in large scale,they were the most important auxiliary regenerative hydrocarbon source rocks in the northern Tarim Basin.

中石化西北油田分公司科技项目(KY-S2006-21)资助

https://doi.org/10.11781/sysydz201204445