歧北深层高温高压条件下烃源岩特殊的成烃演化规律  

Special hydrocarbon-generation evolution of source rocks under deep, high temperature and pressure in northern Qikou area

作　　者：陈善勇[1] 李军[2] 孙兵[2] 周立英[2] 

机构地区：[1]中国石油大港油田公司科技信息处 [2]中国石油大港油田勘探开发技术研究中心

出　　处：《石油勘探与开发》2003年第1期38-40,共3页Petroleum Exploration and Development

摘　　要：黄骅坳陷歧北地区深层高温高压条件下古近系烃源岩成烃演化规律与传统的干酪根降解演化规律存在差异 ,其差异突出体现在成熟度参数的演化特征上。在分析歧北深层烃源岩特殊的成熟演化特征及不同温压条件下热压模拟演化特征的基础上 ,探讨超压在深层烃源岩成烃演化过程中的作用 ,总结高温高压条件下深层烃源岩特殊的成烃演化规律。指出 :虽然超压影响油气生成演化的全过程 ,但在不同演化阶段超压的影响是不同的。超压的滞烃效应主要作用于烃类进入生烃高峰的后期 ,超压不仅可抑制液态烃向气态烃的转化 ,而且还抑制干酪根的降解 ,使油气生成的时限延迟 ,以致在正常条件下预测生气的深度仍将继续生油。歧北地区深层高温高压条件下古近系烃源岩特殊的成烃演化规律主要体现在成熟油相窗口向高成熟早期的推移。图 4表 1参Hydrocarbon-generation evolution of source rocks under high temperature and pressure in Tertiary deep strata of Qikou sag is different from the conventional evolution of kerogen degradation, which is obviously in response to the maturity criteria characteristics. Through the analysis of specific hydrocarbon-generation evolution and pyrolysis simulation of Qikou deep strata, the author studies the overpressure influence on source rocks, summaries the specific hydrocarbon generation characteristics. the overpressure always restrains the hydrocarbon evolution, but its restraining degree is different from time to time. The overpressure restraining effect becomes stronger after the peak hydrocarbon generation, it not only restrains the conversion from oil phase to dry gas phase, but also does kerogen degradation, and leads to the lag of hydrocarbon generation, results in the depth of oil generation deeper than predicting according to normal kerogen evolution. The specific hydrocarbon generation of Qikou Sag shows gas phase changed into oil phase in low mature to mature stage and mature oil window moved up to early high mature stage.

关 键 词：大港油田 歧北地区 深层勘探 高温 高压 烃源岩 成烃演化 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]