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长春油田C区块双阳组二段是主要勘探层段,双二段划分出5个砂组,其中Ⅲ砂组和Ⅳ砂组是主要产油砂组。通过沉积特征研究,认为双二段为扇三角洲沉积。Ⅰ砂组和V砂组是扇三角洲前缘沉积,Ⅱ砂组-Ⅳ砂组为扇三角洲平原沉积,砂体的分布受沉积相带控制比较明显,砂体沿北西向展布。在明确该区地层沉积特征的基础上,开展了研究区油气藏成藏条件研究,认为大南凹陷具有供烃能力,双阳组是供烃层组,双三段暗色泥岩是区域盖层,17号断层及派生出的一系列近南北向正断层前期沟通油源、疏导油气,后期具有良好的封堵作用。C区块单井纵向上整体为油层-油水层-水层组合,上倾部位为油层,下倾部位为同层、水层。油水易于在构造圈闭范围内平衡,在-1 695 m形成统一的油水界面。双二段为一个成藏体系,整体为断块类型油气藏。低渗-中孔、低渗-低孔、特低渗-低孔储层是剩余油主要分布区,剩余油的形成受相控和构造控的影响,主要发育在河道储层中。
The second section of Shuangyang Formation in Block C of Changchun Oilfield is the main exploration section. Five sand groups are divided into two sections, of which the Group III sand and the Group IV sand are the major oil-producing sand groups. Based on the study of sedimentary features, it is considered that the second member is fan delta deposition. Group I sand and sand V are the delta front deposition, group II sand-Ⅳ sand is fan delta plain, and the distribution of sand bodies is controlled by sedimentary facies. The sand body distributes in the northwest direction. Based on the sedimentary characteristics of the strata in this area, the study on hydrocarbon accumulation conditions in the study area has been carried out. It is concluded that the hydrocarbon supply capability exists in the Dainan Formation, that the Shuangyang Formation is a hydrocarbon source formation and that the Shuangsanian dark mudstone is a regional cap layer. No. Fault and derive a series of near-north-north normal faulting communication oil source, divert oil and gas, the latter has a good blocking effect. In the vertical section of Block C, the whole block is composed of oil layer, oil-water layer and water layer. The upper part is oil layer and the lower part is same layer and water layer. Oil water is easily balanced within structural traps, forming a uniform oil-water interface at -1 695 m. The second member is a reservoir forming system, the whole is a fault block type reservoir. The low-permeability, medium-permeability, low-permeability-low-porosity and extra-low permeability-low-porosity reservoirs are the main distribution areas of remaining oil. The formation of remaining oil is controlled by facies control and tectonic control and mainly occurs in the channel reservoirs.