中文摘要：

致密砂岩中的油气成藏是油气地质学领域内的前沿问题。如何将影响油气运移成藏的流体动力、成岩事件与油气成藏期次研究相结合，以准确确定油气的成藏机理，仍是目前研究中的薄弱环节。首先论证了青山口组烃源岩的热演化程度和生烃潜力；恢复了最大埋深时期（古近纪末）泥岩的过剩压力，探讨了流体动力作用下的油气运移、成藏特点；立足成岩作用与成藏事件的紧密联系，根据次生包裹体均一温度、自生碳酸盐矿物的碳、氧同位素资料分析了成藏期次；最后综合石油地质概念模式和储层内流体活动的记录，建立了油气运移、成藏的模式。研究认为，青山口组烃源岩经历了较高的热演化程度（R0达1．0％～1．2％），古近纪时其中的过剩压力可达6～11MPa，为油气运移提供了充足动力，砂岩储层内曾于明水期（K2m）内发生过含烃流体的两期注入。提出了古近纪前、后的“跷跷板”式成藏模式，即明水期一古近纪油气主要由源区向西南方向运移，而新近纪后的油气运移主要靠浮力驱动，但因储层已致密化，难以形成较高的连续油柱，油、水的分异程度低。

英文摘要：

The accumulation of hydrocarbon in tight sandstone is a frontier scientific question in petroleum geology. It is still the weak key part nowadays to define the mechanism on hydrocarbon accumulation accurately in which how to combine fluid dynamics influencing migration and accumulation of hydrocarbon, diagenetic events and the phase of hydrocarbon accumulation. In this paper, the thermal maturity and hydrocarbon generation potential of source rock in Qingshankou Fm are demonstrated and proved first. The excess pressure＇in source rock during deepest burial depth （i. e. in the end of Paleocene） is restored according to method of equilibrium depth from compaction curves, the characters of hydrocarbon migration and accumulation acted on by fluid dynamic are probed. On the basis of the close connect between diagenesis and accumulation events, the phase of hydrocarbon accumulation is analyzed according to distribution of homogenization temperature from secondary fluid inclusion, and the data of carbon and oxygen isotope in authigenic mineral of carbonate from fracture. At last, the model of hydrocarbon migration and accumulation is established on synthesizing concept model of petroleum geology and the record of fluid activity in reservoir rock. It is concluded that： （1） the source rock is being a higher grade of thermal maturity with the Ro of 1.0- 1.2% （2） the excess pressure in source rock during Paleocene was high up to from 6 to 11 MPa, so as an efficient dynamic in driving hydrocarbon, （3） there were two phase of hydrocarbon infilling during Mingshui stage （K2m）, （4）The model of hydrocarbon accumulation with ＇seesaw＇ style is put forward that hydrocarbon migrated from northeastern source area （kitchen） to southwestern direction from during Mingshui stage to Paleocene; then the migration was mainly driven by buoyancy in adjusting periods of reservoir after Neocene, it is difficult to form high continuous oil column, because of the reservoir bed being over tight.