Abstract:

Large deltaic depositional system was developed in the Mesozoic of the North Shaanxi Province. The different genetic sandstones,such as deltaic plain distributary river course,deltaic front debouch bar,are in the upper of widely distributed mature source rock or exist in the interbed of mature source rocks and then form subtle lithologic pools with low porosity,low pressure and low graphic kurtosis. The exploration history was studied,and the exploration current situation and reservoir formation were analyzed. According to the new resource evaluation,the resource potential in North Shaanxi Province was recognized. The amount and distribution of different types and grades of hydrocarbon resources were determined. It is pointed that North Shaanxi province is still one of the main exploration regions in the Mesozoic of Ordos Basin for its good resource potential.

Key words: North Shaanxi Province, deltaic depositional system, lithologic pool, hydrocarbon accumulation, resource potential, exploration direction

摘要：

陕北地区中生界发育大型三角洲沉积体.三角洲平原分流河道、三角洲前缘河口砂坝等各种成因的砂体极为发育.砂体处于大面积分布的成熟烃源岩之上,或夹于成熟烃源岩之中,形成大面积分布的低孔隙度、低渗透率、低压力、低丰度隐蔽性砂岩岩性油藏.通过回顾勘探历史、分析勘探现状和油气成藏地质条件,结合新一轮资源评价结果,对陕北地区资源潜力进行了重新认识,阐明了各类、各级油气资源的数量和分布.陕北地区中生界石油资源潜力优于盆地其他地区,是鄂尔多斯盆地中生界今后勘探的主要地区之一.

关键词: 陕北地区, 三角洲沉积体, 岩性油藏, 油气富集, 资源潜力, 勘探方向