塔北地区寒武系—奥陶系源岩含油气系统研究

CAMBRIAN-ORDOVICIAN PETROLEUM SYSTEM IN THE NORTHERN TARIM BASIN

寒武系—奥陶系源岩含油气系统是塔北地区最重要的一类已知含油气系统。据生烃期，寒武系—奥陶系源岩含油气系统进一步划分为早期和晚期两个亚系统。通过保存条件分析， 本文引入了残留含油气系统和原型含油气系统概念。早期亚系统属残留含油气系统， 晚期亚系统为原型含油气系统。早期亚系统可能形成大型油气田，是寻找大油气田的重要勘探目标，但其经历长时间的发展演化， 保存条件是影响勘探的关键因素， 晚期亚系统以中小型油气田为主， 其成藏晚， 保存条件较好，是目前的重要勘探对象。

The Cambrian-Ordovician petroleum system is the most important system type in the northern region of Tarim basin .The petroleum system is divided into the early and late subsystems by hydrocarbon generation periods. By the analysis of preservation condition,the concepts of residual and prototype petroleumsystems are introduced .The early subsystem is residual and the late one is prototype.In the early subsystem, large-size oil and gas fields could be developed.The early subsystem is an important exploration target for large-size oil and gas fields.But it experienced long-term evolution process,and its preservation condition is a key factor for petroleum exploration.Medium-and small-size oil and gas fields are dominated in the late subsystem. For its later hydrocarbon accumulation and better preservation condition,the late subsystem is now a main exploration target.