摘要
下二门短轴背斜位于泌阳凹陷东北边缘,由栗园—泌阳边界大断裂的逆牵引作用形成。背斜上的七条正断层将背斜分割成四个断块,其中Ⅱ断块呈垒块状。与边界大断层平行的④号断层和同生断层组合成一明显的断阶带,它们对本区沉积格局、相带展布、油气储集、开发都起着明显的控制作用。在边界断层和④号断层控制下,物源区地势高耸,紧临湖泊,为扇三角洲半深湖沉积体系发育提供了有利条件。平面上多个粗碎屑扇三角洲扇体并接,砂层发育,物性条件好,其前缘靠近生油区,又有后期碳酸盐泥坪沉积封闭,构成了较佳的生、储、盖组合。在纵向上扇体重迭,增大了储集相带累积厚度,加上断阶带有从西向东迁移的趋势,增大了有利储集相带范围。有利沉积相带区往往与背斜构造交点的迭合,形成了一个油层厚、地层压力大、产油能力强、含水量上升慢的高产油田。
Xiaermen brachy-anticline,located in the north-eastern margin of Bi- yang depression,was formed by the reverse drogging of the boundary fault of the depression-Liyan-Biyang fault and is cut by seven normal faults forming four blocks.A step-like fault zone,composed of several parallel faults in N-S direction,the major boundary fault,the fault No.4 and the growth fault has obviously controlled the sedimentary framework,oil-gas reservoir and their development. Firstly,being controlled by the boundary fault aud the fault No.4,the provenance was close to the lake,expressed as a high relief ard was of great advantage to the development of a fandelta-bathyal sedimentary sys- tem.A series of fan delta bodies,composed of coarse clastics with fairly high porosity and permeability,contact with source rock and are sealed by a flat mudstone.Hence,an ideal source-reservoir-seal association is formed. The vertically overcapping fan-delta bodies thickened the reservoirs.Ad- ditionally,the drift of the step-like fault zone from west to east resulted in a further expanding of the perspective area. Finally,the advantageous sedimentary facies zone generally coincides wi- th the high points of the anticline,which led to the concentration of high production area on the top,forming a high-field oil area with a thick reservoirs,high stratigraphic pressure,high production potentiality and low water content.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期87-94,共8页
Petroleum Exploration and Development
