乌尔逊凹陷暗色泥岩排烃特征
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摘要
生烃潜力指数是判别烃源岩是否排烃的重要指标.结合已知沉积相、地震相、构造发育特征等其他资料,分析研究区有效烃源岩厚度及其平面分布特征.综合利用乌尔逊凹陷不同层段的有机碳及有效烃源岩排烃率、厚度、密度等参数,给出研究区各个主力烃源岩层段的排烃强度,并计算各烃源岩层段的排烃量.研究结果表明,南屯组与大磨拐河组的排烃模式有所差异,南一段、南二段和大一段排烃量均较大,大二段和铜钵庙组排烃量较小.
Hydrocarbon generation potential index is an important parameter to judge whether the source rocks have excluded hydrocarbon or not, which is a synthetic pyrogenation index-(S1+S2)/TTOC. Combined with the data of sedimentary facies, the distribution characteristics of the effective source rocks can be obtained. With the data of TOC, hydrocarbon expulsion ratio, thickness and density of the source rocks in the research area, the hydrocarbon expulsion intensity will be reduced of each main source rock. The results of hydrocarbon expulsion characteristics indicate that the expulsion models are different among the formations and the Nantun formation has the biggest hydrocarbon expulsion amount in the whole depression.
Hydrocarbon generation potential index is an important parameter to judge whether the source rocks have excluded hydrocarbon or not, which is a synthetic pyrogenation index-(S1+S2)/TTOC. Combined with the data of sedimentary facies, the distribution characteristics of the effective source rocks can be obtained. With the data of TOC, hydrocarbon expulsion ratio, thickness and density of the source rocks in the research area, the hydrocarbon expulsion intensity will be reduced of each main source rock. The results of hydrocarbon expulsion characteristics indicate that the expulsion models are different among the formations and the Nantun formation has the biggest hydrocarbon expulsion amount in the whole depression.
引文
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[2]宋芝祥.油气资源评价方法的选择[J].沉积学报,1987,5(1):104-113.
[3]庞雄奇.排烃门限控油气理论及应用[M].北京:石油工业出版社,1995,164-171.
[4]程克明.生油岩的定量评价[C]∥石油勘探开发科学研究院地质研究所,中国陆相油气生成.北京:石油工业出版社,1982:175-188.
[5]TISSOT B T,WELLTE D H.Petroleum Formation and Occurrence:A New Approach to Oil and Gas Exploration[M].Berlin:Springer-Verlag,1978:486.
[6]黄第藩,李晋超,周翥虹,等.陆相有机质演化和成烃机理[M].北京:石油工业出版社,1984:17-32.
[7]周杰,庞雄奇.一种生、排烃量计算方法探讨与应用[J].石油勘探与开发,2002,29(1):24-27.
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