Modeling of the whole hydrocarbon-generating process of sapropelic source rock

• 作者: LI Jian LI Zhisheng MA Chenghua MA Wei WANG Dongliang WANG Yifeng XIE Zengye
• 来源期刊: 石油勘探与开发:英文版
• 学科: 地球科学
• 关键词: sapropelic source rock hydrocarbon-generating model HYDROCARBON EXPULSION efficiency experiment of HYDROCARBON generation KEROGEN degradation GAS cracking GAS
• 年，卷（期）: 2018,（3）
• 页码范围: 461-471
• 页数: 11页
• 分类号: P618.13

摘要

Based on experimental data from hydrocarbon generation with a semi-open system, hydrocarbon generation kinetics modeling in gold tube of closed system, high temperature pyrolysis chromatography mass spectrometry experiment with open system and geological data, the characteristics of whole hydrocarbon-generating process, hydrocarbon expulsion efficiency and retained hydrocarbon quantity, origins of natural gas generated in high-over mature stage and cracking temperature of methane homologs were investigated in this study. The sapropelic source rock has a hydrocarbon expulsion efficiency of 30%-60% and 60%-80% in the major oil generation window(with Ro of 0.8%-1.3%) and high maturity stage(with Ro of 1.3%-2.0%) respectively;and the contribution ratio of kerogen degradation gas to oil cracking gas in total generated gas in high maturity stage is about 1:4. The degradation gas of kerogen accounts for 20%, the retained liquid hydrocarbon cracking gas accounts for 13.5%, and the amount of out-reservoir oil cracking gas(including aggregation type and dispersed oil cracking gas) accounts for 66.5%. The lower limit of gas cracking is determined preliminarily. Based on the new understandings, a model of the whole hydrocarbon-generating process of source rock is built.