东濮凹陷南部湖相油气特征与成因机制

文中采用生物标志物、链烷烃单体碳同位素、天然气组成与碳同位素技术方法,研究了东濮凹陷南部油气特征及成因机制。结果表明:东濮凹陷南部油气纵向上来自沙三中、沙三下亚段烃源岩。但是,平面上,桥口油田主要是来自前梨园洼陷Ⅱ型干酪根生成的油气,天然气以油型气为主,油气具有多期充注特征,属于深部超压油气藏;马厂与三春集油田主要是来自葛岗集洼陷Ⅱ2-Ⅲ型干酪根生成的油气,天然气以煤型气为主,充注时间单一,为常温常压油气藏。东濮凹陷南部油气藏普遍层薄、致密、低孔、低渗,具有重要的致密气勘探前景。

Characteristics and genetic mechanism of lacustrine hydrocarbon in south of Dongpu Depression

This research used the technique method of biomarkers,free carbon isotope of paraffin,gas composition and carbon isotope to reveal the characteristics and genetic mechanism of oil and gas in the south of Dongpu Depression.The result shows that the crude oil and gas are generated from Es3M and Es3L source rocks vertically,but have different characteristics on the plane.Such as the hydrocarbon from Qianliyuan Sag in the Qiaokou Oilfield is generated by typeⅡkerogen,and the oil type gas is the dominated natural gas.The reservoir which was filled through multi-stage filling belongs to deep overpressure oil and gas reservoir.The hydrocarbon from Gegangji Sag in the Machang-Sanchunji Oilfield is generated by typeⅡ2-Ⅲkerogen,coal type gas is mainly natural gas,and the reservoir has a single filling time,normal temperature and pressure.The oil and gas reservoirs have the characteristics of thin-layer,low-porosity,low-permeability in the southern part of Dongpu Depression,and are the further prospects for tight gas exploration.