【摘要】 综合利用地震、测井、录井、岩心及分析化验资料,通过综合分析和系统沉积学编图,查明了东营组三段下部B区发育的沉积相类型有辫状河三角洲和湖泊.辫状河三角洲发育于黄河口凹陷B区的南部,主要为三角洲前缘的河口坝和远砂坝微相,其余地区为滨浅湖沉积,以滨浅湖泥滩和砂质滩坝沉积为主.B1-B11井一带发育面积近70km2滨浅湖砂质滩坝沉积,滨浅湖砂质滩坝由含砾粗砂岩、含砾中砂岩、含砾细砂岩及中、细砂岩组成,骨架颗粒成分以石英为主,发育低角度交错层理,纹层由定向排列的砾石或暗色组分显示,纹层平直,以低角度相交.辫状河三角洲前缘河口坝、远砂坝和滨浅湖砂质滩坝微相为东营组三段下亚段优质砂岩发育区.更多还原

【Abstract】 Sedimentary facies of the lower member 3 of Dongying Formation in the area B are found mainly including braided-delta and lacustrine facies based on the data of seismic, well logging, core and chemical analysis data and the synthetical analysis and systemic sedimentary mapping. Braided-delta facies consisting of delta front subfacies are located in south of area B. Braided-delta front subfacies include mouth bars and distal bars microfacies. Other areas are characterized by near lake shore sediment, which is mainly mud and near lake-shore sandy bars. The area along the belt of Well B1 and Well B11 is covered by near lake-shore sandy bars with the area of nearly 70 kilometers square. The sandy bars, whose skeleton grains are dominated by quartz, are composed of shingly gritstone, shingly packsand, and fine packsand. The sandy bars have low-angle cross bedding, whose lamina is orthoscopic and intersected in low angle, presented by orientated gravel or dark constituent. The mouth bars, distal bars and near lake-shore sandy bars are high quality reservoirs of the lower member 3 of Dongying Formation.更多还原