摘要
以塔里木盆地海相碳酸盐岩层系为重点,研究烃源岩发育与油气藏之间的关系,探讨中国高热演化程度、低TOC值(小于0.5%)海相碳酸盐岩层系作为烃源岩的可能性及其生烃机理。通过对塔里木盆地烃源岩分布与塔河油田油气藏的匹配关系、烃源岩成烃生物组合及其与油气藏的地球化学特征对比分析,建立海相碳酸盐岩烃源岩成烃物质评价方法。研究得出塔里木盆地塔河油田原油并非来自泥质烃源岩,而具有来源于碳酸盐岩烃源岩的明显特征,进一步揭示高热演化碳酸盐岩中被低估的生烃物质(有机酸盐)及碳酸盐岩中优质成烃生物组合是高热演化碳酸盐岩可以作为烃源岩的关键,有机酸盐具有高温裂解成烃、主体成气和成烃转化率高的生烃特征。塔里木盆地寒武系—中下奥陶统有效碳酸盐岩烃源岩的发育模式以陆棚模式为主。
The marine carbonates of the Tarim Basin are taken to study the relationship between source rock and oil and gas reservoirs and discuss the possibility and mechanisms of mature and low-TOC （less than 0.5%） marine carbonates being source rock. By studying the matching relationship between source rocks in Tarim Basin and hydrocarbon reservoirs in Tahe oilfield and analyzing the hydrocarbon-generating organism combination and its correlation with geochemical characteristics of oil and gas reservoirs, this study established a method to evaluate hydrocarbon generation substance of marine carbonate source rocks. It is concluded that the crude oil of the Tahe oilfield in the Tarim Basin is not derived from muddy source rocks, but has the obvious characteristics derived from carbonate source rocks. It revealed that the underestimated hydrocarbon-generating substance （organic acid salts） in the highly evolved marine carbonate rocks and high quality hydrocarbon-generating organism are the key to high-evolution carbonate rocks being as source rock. Organic acid salts have high hydrocarbon conversion rate and are mainly cracked into natural gas at high temperature. The development model of the source rocks of the Cambrian-Lower Ordovician carbonate source rocks in the Tarim Basin is dominated by the shelf model.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2017年第1期155-164,共10页
Petroleum Exploration and Development
基金
国家重点基础研究发展计划(973)项目(2012CB214801)
关键词
塔里木盆地
碳酸盐岩
烃源岩
成烃生物
有机酸盐
生烃理论
Tarim Basin
carbonate rocks
hydrocarbon source rock
hydrocarbon-generating organism combination
organic acid salts
hydrocarbon generating theory
