济阳坳陷中-新生代叠合盆地及油气成藏

The Mesozoic-Cenozoic Superposing Basin of Jiyang Depression and Oil-Gas Accumulation

济阳坳陷中-新生代盆地是多次构造与沉积叠加形成的叠合盆地。通过分析不同走向断裂的活动特征,明确了中-新生代控盆断层经历了印支构造运动晚期北西(西)向逆冲断层、燕山构造运动中晚期北西(西)向断层构造反转、燕山-喜马拉雅构造运动过渡期北西(西)向断层的消亡及北东(东)向断层的产生3次重要的发育及转型阶段。将济阳坳陷中-新生代叠合盆地划分出"中凹新凹"、"中凹新凸"、"中凸新凹"、"中凸新凸"4种类型的叠合单元,探讨了叠合盆地中断层叠合、界面叠合以及构造叠合对油气成藏的作用,建立了中生界油气成藏模式,指出了"中凸新凹"型叠合单元与"中凹新凸"型叠合单元是中生界最为有利的成藏场所。

The Mesozoic-Cenozoic basin of Jiyang Depression is a superposing basin which superposed multiple tectonic cycles and corresponding sediments deposits. The basin-controlled faults of Jiyang Depression mainly experiences three growing and adjusting phases in the Mesozoic-Cenozoic： thrusting north-west-ward （westward） during the late Indosinian movement, north-west-trending（west-trending） faults reversing during the middle-late Yanshan movement, and north-west-trending（west-trending） faults disappearing and north-eastward extending during interim of the Yanshan and Himalayan movements. Based on the structural characteristics, the Mesozoic-Cenozoic superposing basin of Jiyang Depression could be classified into four types of superimposing units： ＂sag in both Mesozoic and Cenozoic＂ , ＂sag in the Mesozoic and up- lift in the Cenozoic＂, ＂uplift in the Mesozoic and sag in the Cenozoic＂, and ＂uplift in both Mesozoic and Cenozoic＂. The reservoiring models are established for every kind of superimposing units based on the effect analysis of superposing patterns of faults, interfaces and tectonic stocks on oil-gas accumulating. It is concluded that the superimposing units of both ＂sag in the Mesozoic and uplift in the Cenozoic＂ and ＂uplift in the Mesozoic and sag in the Cenozoic＂ are most favorable for oil and gas accumulation.