Water Consumption in Hydrocarbon Generation and Its Significance to Reservoir Formation
详细信息
- 责任者：Wang Yongshi (Geoscience Research Institute ; Shengli Oilfield Company ; SINOPEC ; Dongying 257015 ; China) ; Zhang Shouchun
- 刊名：Petroleum Exploration and Development
- 出版年：2013
- 卷期：40(2)
- 关键词：烃源岩 ; source rocks ; 生烃作用 ; hydrocarbon generation ; 油气藏形成 ; reservoir formation ; 东营凹陷 ; Dongying Sag
- 页码：p.242-249
- 图表：illus., 2 tables, 24 refs.
- 分类号：1003
- issnNo：ISSN1000-0747
- isbnNo：CN11-2360/TE
摘要
The geochemical effects of water consumption during hydrocarbon generation were studied on the basis of evolution laws of source rocks and simulation experiments on hydrocarbon generation.Water consumption statistics were obtained in order to study the relationship between water consumption during hydrocarbon generation and hydrocarbon migration and reservoir formation.The simulation experiments of hydrocarbon generation were performed under hydrous and anhydrous conditions for correlation.The geochemical characteristics of organic evolution under these two conditions were analyzed and the variations of hydrocarbon generation potential and carbon transformation ratio were emphasized.The results show the effects that organic matter and water have on each other during hydrocarbon generation: part of unavailable carbon is activated in kerogen and hydrogen is increased in degraded products,which leads to the increase of total hydrocarbon generation potential.According to water consumption mechanisms,the quantitative evaluation method of water consumption in hydrocarbon generation was put forward and used in the studies of the main source rocks in the Dongying Sag.Both of the water consumption and the depth range of the Upper Es4 Member are larger,while those of the Lower and Middle Es3 Members are smaller.Water consumption affects hydrocarbon migration and accumulation by increasing organic carbon degradation rate to increase fluid volume.Pore fluid pressure and oil-bearing saturation are consequently increased.The matching relationship between water-consuming hydrocarbon generation intervals and water-consuming diagenesis intervals enhances the dynamic forces of hydrocarbon migration,which benefits the formation of self-generating and self-preserving reservoirs or lower-generating and upper-preserving reservoirs.
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