渤中凹陷东三段源岩生排烃模拟实验  

Simulation experiment on hydrocarbon generation and expulsion of source rocks in the third member of Dongying Formation,Bozhong Sag

作　　者：李阔 王飞龙 王波 王广源 程焱 王晓东 LI Kuo;WANG Feilong;WANG Bo;WANG Guangyuan;CHENG Yan;WANG Xiaodong(CNOOC Ener-Tech Drilling&Production Company,Tianjin 300459,China;Tianjin Company of CNOOC(China)Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海油能源发展工程技术公司,天津300459 [2]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《石油地质与工程》2025年第1期39-46,共8页Petroleum Geology and Engineering

基　　金：中海油集团公司科研条件平台建设项目(CNOOC-KJPTGCJS2020-01)。

摘　　要：渤海湾盆地古近系东营组三段是渤海海域特有的烃源层系,属于中等-好的湖相生油岩。为研究东三段烃源岩的生烃、排烃特征,选取渤中凹陷东三段有机质丰度高、未成熟的Ⅱ_(1)型暗色泥岩,结合东三段的热史和埋藏史,设计并实施了半开放体系生排烃热压模拟实验。结果表明,渤中凹陷东营组具备较大烃源岩规模和较高的有机质成熟度,源内液态烃流动性好、地层压力充足、排烃效率高;东三段湖相泥岩具备低-中成熟阶段“生油、滞留”,中-高成熟度阶段“产气、排油”的特点;成熟演化作用对东三段泥岩的生烃、排烃和滞留烃特征均有显著影响,是东营组能否有效供烃的关键因素;提出了东三段湖相泥岩等效成熟区间0.51%~1.89%的生烃、排烃和滞留油演化模式,为渤中凹陷超深层、高演化的东三段烃源岩有效供烃量、源内滞留烃存量以及油气转换关系的研究提供了实验参考,也为渤海海域东营组湖相泥岩的资源潜力评价奠定了基础。The third member of Dongying Formation(E_(3)d^(3))in Bohai Bay Basin is a unique hydrocarbon source layer of Bohai Sea which belongs to medium or good lacustrine source rock.To study the hydrocarbon generation and expulsion characteristics,a set of semi-open system hydrocarbon generation and expulsion simulation experiments are carried with the E_(3)d^(3) dark mudstone of Ⅱ_(1) type and low-mature with TOC content.Based on its thermal and burial history,a semi-open system simulation experiment for hydrocarbon generation and expulsion was designed and implemented.The results indicate that the Dongying Formation in the Bozhong Sag has a large scale of source rocks and high organic matter maturity.The liquid hydrocarbons in the source have good fluidity,sufficient formation pressure,and high hydrocarbon expulsion efficiency.It is concluded that the E_(3)d^(3) lacustrine mudstones of the Bohai Sea have the characteristics of“oil generating and retaining”in the low-middle maturity stage and“gas producing and oil expulsing”in the medium-high maturity stage.Mature evolution has a great impact on hydrocarbon generation,hydrocarbon expulsion and hydrocarbon retention characteristics of the E_(3)d^(3) mudstone,which is the key factor for the effective hydrocarbon supply of the Dongying Formation.A hydrocarbon generation,expulsion,and retention evolution model was proposed for the equivalent maturity range of 0.51%~1.89% of lacustrine mudstone in E_(3)d^(3),which provides experimental reference for the research on the effective hydrocarbon supply,hydrocarbon retention and hydrocarbon conversion of the ultra-deep and highly evolved source rocks in the E_(3)d^(3) formation of the Bozhong Sag,and also lays a foundation for resource potential evaluation of lacustrine mudstone of Dongying Formation in Bohai Sea.

关 键 词：渤海海域 东营组烃源岩 半开放体系模拟实验 油产率校正 生排烃特征 

分 类 号：TE122.1[石油与天然气工程—油气勘探]