松辽盆地南部断陷层页岩油富集机理研究

Shale oil is an important unconventional petroleum resources, in recent years, the research of its enrichment mechanism is a frontier subject in petroleum geology. The shale oil has been discovered in Qingshankou formation of the depression layers in Songliao Basin, and the studies of basic theory problems about shale oil mainly focus on the Qingshankou formation. Especially, in the past few years, the successive findings of shale oil in Shahezi formation (K1sh)and Yingcheng formation(K1yc) in Lishu fault depression, and Jiufotang formation in Zhangwu fault depression, which show a favorable prospect, but such related research results rarely reported. In this application, the basic geology problems of the faulted subsidence in this area are proposed to be studied. 1) shale oil discharge and residual mechanisms; 2) utilizing comprehensive means to fine describe micro- and nanometer pore structures and fracture systems of shale oil reservoirs, performing confined pyrolysis (gold capsules) experiments under different temperature and pressure conditions, studying the differences of microscopic reservoir spaces of the shale in the hydrocarbon generation process, the occurrence state、retention and accumulation theory and the preservation mechanism of shale oil in the faulted subsidence of Songliao Basin; 3) studying the major controlling factors which affect shale oil accumulation and preservation with the analysis of typical shale oil reservoir, in order to reveal the enrichment mechanism of shale oil, and the forming conditions of geology and geochemistry of shale oil reservoir. With the study of these scientific problems, this application could enrich the petroleum genesis theory of the faulted subsidence, further explore the genesis rules of shale oil reservoir, and provide basic data for shale oil quantitative evaluation、exploration and exploitation.

页岩油是一种重要的非常规油气资源，其富集机理研究是近年来油气地质领域研究的前沿课题。松辽盆地坳陷层青山口组已发现工业页岩油流，有关页岩油的基础理论问题研究也基本集中在青山口组。近年在松辽盆地南部梨树断陷的沙河子组与营城组、彰武断陷九佛堂组也发现了页岩油，而这类石油的研究却鲜有报道。本项目拟对该地区断陷层页岩油的基础地质问题进行研究。1）利用干酪根溶胀模拟实验，研究页岩油排出与残留机制；2）利用综合手段精细刻画页岩油储层的微-纳米孔隙结构和裂缝系统，开展不同温压条件下的模拟实验，对比研究富有机质页岩热演化前后的微观储集空间变化，研究断陷层页岩油的赋存状态、滞留机理以及储集机制；3）研究页岩油储集与聚集的主要控制因素，揭示页岩油富集机理，研究页岩油藏形成的地质-地球化学条件。对这些科学问题的研究，可以丰富松辽盆地南部断陷层油气成因理论，探索页岩油藏的形成规律，为研究区断陷层页岩油的定量评价和勘探开发提供基础资料。