【摘要】 以南华北盆地野外剖面、钻井及钻孔为研究对象,在地层划分、对比的基础上,将南华北盆地"石盒子组"划分为三角洲和潟湖沉积相,其中三角洲可进一步识别出三角洲平原、三角洲前缘亚相及众多微相。在单井及井间沉积相对比研究基础上,结合地震剖面对比,对南华北盆地上、下石盒子组岩相古地理平面分布及垂向演化特征进行了详细研究,结果表明:在上、下石盒子组沉积期由北至南均具有三角洲平原—三角洲前缘—潟湖的相带展布特征,在沉积演化过程中,不同时期古地理特征既有继承性又有差异性。在上述研究基础上,综合各类测试分析,对南华北盆地"石盒子组"储层及盖层发育特征进行了研究。储层由分流河道、水下分流河道和河口坝砂体组成,具有原生粒间孔、粒间溶孔及粒内溶孔的储集空间,且上石盒子组砂体无论从砂体厚度,还是储集性均优于下石盒子组砂体。"石盒子组"为泥岩盖层。这一盖层为承受大压力、渗透率低,油气封闭性好,且单层厚度大,横向分布稳定的区域性盖层。上述研究成果为南华北盆地储层分布规律研究和油气预测提供了重要的基础地质资料。更多还原

【Abstract】 Based on stratigraphic division and stratigraphic correlation,the division plan of sedimentary facies of southern North China Basin was determined through detailed analysis to field profiles,well and borehole.Middle Permian Shihezi formation in southern North China Basin can be classified into delta facies and lagoonal facies.Thereinto,two forms sedimentary subfacies that are delta plain,delta front and many microfacies are identified from delta facies.Combining with regional seismic profiles,the paper makes thorough study on single well and interwell,then carries on detailed research to the plane distribution and vertical evolution characteristics of lithofacies palaeogeography characteristics of Middle Permian Shihezi formation in southern North China Basin.From the north to the south,the sedimentary facies plane distribution expressed as delta plain-delta front-lagoonal facies during the deposition of the upper and lower Shihezi formation,moreover the paleogeographic features in various phases has both succession and discrepancy.Finally,a research about lithofacies palaeogeography and reservoir,cap rock characteristics of Shihezi formation in southern North China Basin was operated on the basis of research result stated above and synthetical analysis data.The distributary channel,submarine distributary channel and river mouth bars are best reservoir of the study area.The reservoir pore space consists of primary intergranular pore,intergranular dissolved pore,intragranular dissolved pore,moreover the reservoir space of Upper Shihezi formation is superior compared with that of Lower Shihezi formation.As the stable distributed regional mudstone cap,Shihezi formation has the following key features,such as difficult to break through,low permeability,good sealing property of oil and gas,great thickness and distributing stabilization in landscape orientation.The research result about sedimentary facies and oil-gas geological characteristics we have reached wil provide a significant reliable geological data for the distribution regularity of favorable reservoir and oil-gas prediction of southern North China Basin.更多还原