济阳坳陷页岩油赋存状态和可动性分析

AN ANALYSIS ON OCCURRENCE STATE AND MOBILITY OF SHALE OIL IN JIYANG DEPRESSION

济阳坳陷页岩油气资源丰富,具有广阔的勘探前景。济阳坳陷页岩油赋存空间有孔隙、裂缝和夹层。济阳坳陷页岩油赋存状态有游离、溶解和吸附状态三种状态,以游离态和吸附态为主,含有少量溶解态页岩油。在页岩油生产井中仅发现游离态和溶解态页岩油。济阳坳陷页岩油在地层中的赋存状态这种多样性和差异性造成了页岩油在投产过程中含水率存在差异性。通过地层压力、地层水特征、碳同位素和生物标志化合物对比分析等资料,可以推断出济阳坳陷页岩油虽然源储同层,但大都发生了相当距离的初次运移,在"异地"聚集形成页岩油。该成果对分析页岩油形成机理有一定借鉴作用。

Shale oil and gas in Jiyang depression is rich and has broad prospects for exploration.Shale oil space in Jiyang depression includes pores,fractures and interplayers. Shale oil state in Jiyang depression includes free,dissolved and adsorbed state.There is mainly the free and adsorbed state and small amounts of dissolved shale oil.free and dissolved shale oil is only found in shale oil production wells. The diversity and differences of shale oil state in Jiyang depression causes differences of water content of shale oil in the production process.It is deduced that Shale oil primary migration may occur for a certain distance and shale oil is formed in the different places in the same formation by analysis of formation pressure,formation water feature,carbon isotope and biomarker contrast. The results has certain reference for the analysis of the formation mechanism of shale oil.