渤海湾盆地济阳坳陷陈家庄凸起东段北斜坡油源特征及成藏分析

渤海湾盆地济阳坳陷陈家庄凸起东段北斜坡带的油源主要来自沾化凹陷,烃源岩主要发育在渤南、孤南、富林洼陷的沙四段、沙三段和沙一段,其中沙三段时期为典型的淡—微咸水还原的湖泊沉积环境,烃源岩有机质的母质来源主要以水生浮游动植物为主。烃源岩特征分析及油源对比结果表明,垦68、垦69井的原油主要来自于渤南洼陷的沙三段烃源岩,油气主要通过断层、砂体、不整合面以及由它们组成的复合型运移通道运聚到盆地边缘圈闭成藏。 

ZONED-DISTRIBUTION OF OIL AND GAS ACCUMULATION IN FAULT DEPRESSIONS IN THE SONGLIAO BASIN

Controlled by the NNE oriented deep fault rupture,three Late Jurassic-Early Cretaceous fault subsidence zones were developed in the east,middle and west of the Songliao Basin.Evident differences among structure depositional evolutions of these three zones cause distinct zoned-distribution of oil and gas accumulation in this area.In heritage deep sags developed along the Sunwu-Shuangliao deep fault in the central part,large thick lacustrine facies source rocks and volcanic rocks as well as sandstones and grits were developed.The fault sags are overlaid with multiple giant thick lacustrine facies mudstones,providing favorable conditions for oil and gas containing,as well as for continuing thermal evolution.Therefore,a number of middle and large scaled oil and gas fields were developed on the nearly EW strike heritage nose-like dome belt in low uplifts and slope break zones.While in the east and west margin,only small and middle scaled oil and gas fields were developed,due to the small volume of hydrocarbon rocks with lower quality mother matter,low source rock abundance and poor containing condition.