陈家庄凸起北坡东营组油气成藏模式及控制因素

陈家庄凸起北坡东营组地层超覆带油源主要来自渤南洼陷的沙四、沙三段烃源岩,储层主要发育在扇三角洲及其前缘浊积扇体中,其中以东三段砂岩为主力储层,东二段泥岩为局部性盖层,渗透性储层、不整合面和断层为油气运移的主要通道。在凸起边缘可形成地层超覆油气藏,在缓坡带-洼陷带形成断层-岩性油气藏或岩性-构造油气藏。其中,古地貌控制地层超覆和小型鼻状构造油气藏的分布,输导体系控制油气的运移,盖层条件是制约油气成藏的关键;陈家庄凸起西段宽缓的低凸起分布区应为油气成藏的有利部位。

The Reservoir-Forming Model and Controlling Factors of Dongying Formationin in the North Slope of Chenjiazhuang Salient

The stratigraphic overlap oil reservoir of Dongying formation in the north slope of the Chenjiazhuang salient is mainly from the generating rock of Es4 and Es3 in Bonan sag.Its sedimentary facies lies in the fan deta and the front turbidity fan,the main reservoir bed in the sandstone of Ed3,and the local caprock in the mudstone of Ed2.Besides,the permeability reservoir bed,the surface of unoonformity and the fault act as the main carrying path of hydrocarbon.The stratigaphic overlap oil reservoir is formed on the fringe of the salient,while tbe fault-lithologic or lithogic-structural oil reservoir is formed at the location from the gentle slope to the sag.Among all the geologic factors,the distribution of oil reservoir about the stratigraphic overlap and the pilot are subjected to the ancient landform,the motion of petroleum is controlled by the handing system,and the hydrocarbon accumulation is determined by the roof cover. To be exact,the low salient of the wide-gentle in the west of Chenjiazhuang should be the ideal site for the oil and gas exploration.