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盐岩对地层温度及烃源岩热演化的影响:以加蓬盆地X区块为例 被引量:3

Effect of Salt on Formation Temperature and Thermal Evolution of Source Rock:A Case Study on the Area of X in Gabon Coastal Basin
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摘要 应用钻井、测井、地震等资料及盆地数值模拟技术,以加蓬盆地X区块为例,探讨了盐岩对地层温度及烃源岩热演化的影响。结果表明:研究区盐岩体呈带状或点状分布,厚度介于0~3 723m之间,均值808.5m。盐岩的热导率是其他沉积岩的2~4倍,因此受高热导率的影响,使得盐上地层温度及烃源岩成熟度升高,盐下地层温度及烃源岩成熟度降低;且盐岩层越厚,这一影响越大,对于盐下地层,盐厚2 000m时温度差为25.1℃,Ro差值为0.6%。离盐岩层越近,烃源岩成熟度受盐岩的影响越大,对于盐下地层,离盐岩层近的Vembo组Ro差值最大可达1.2%以上。因此,受制于盐岩体的厚度、形态等变化,不能利用钻井揭示的烃源岩成熟度及其演化过程来预测盐岩发育区周围烃源岩的成熟度及演化。 Based on the drilling,logging and seismic data and the basin modeling technique,this paper studies the effect of salt on formation temperature and thermal evolution of source rock taking the area of X in Gabon Coastal Basin as an instance.The results indicate that the distribution of salt is ribbon pattern or dot scope in the study area,with the thickness between 0-3 723 m,averaged at 808.5m.The thermal conductivity of salt is typically two or four times greater than the thermal conductivity of other sedimentary rocks.Therefore,constrained by the high thermal conductivity of salt,the formation temperature of postsalt is raised,and the formation temperature of pre-salt is reduced.When the layer of salt is thicker,the effect on the formation temperature is larger.To the layer of pre-salt,two thousand meters salt have made25.1℃influence of temperature.The source rock maturity of post-salt is raised,and the source rock maturity of pre-salt is reduced.When the layer of salt is thicker,and the nearer the layer of salt,the larger the effect on the source rock maturityis.To the layer of pre-salt,two thousand meters salt have made0.6%influence of source rock maturity,and nearly the salt layer may make 1.2%influence of Vembo Formation.Therefore,because of the thickness of the salt body and shape change,drilling cannot be used to reveal the source rocks maturity and evolution process to predict the maturity and evolution of aroundsource rocks in salt zone.
作者 王柯 郝建荣 杨树春 兰蕾 王建新 Wang Ke;Hao Jianrong;Yang Shuchun;Lan Lei;Wang Jianxin(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处 《地质科技情报》 CAS CSCD 北大核心 2019年第1期142-151,共10页 Geological Science and Technology Information
关键词 热导率 盐岩 烃源岩 热演化 加蓬盆地 thermal conductivity salt source rock thermal evolution Gabon Coastal Basin
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