Study Of Architectural Elements Of ES₂3～4 Sand Body Of Shengtuo Oil Field

Using Miall's architectural elements analysis, the reservoir architecture of Es234 subbed in ShengTuo oil field was researched. Twelve types of lithofacies were distinguished by core survey. Based on core survey, correlations of connecting-well sections and recognition of log curves, six scales of bounding surfaces were defined with the conception of stratification. By the recognition of lithofacies and the classification of sequences, eight kinds of architectural elements were identified. They were channel full sediment (CH), channel retention sediment (CHL), sandbar(CB), fall-siltseam (FS), overbankfine (OF), crevassesplay (CS), chondro of flood plain facies (FF). Finally the planar and sectional assemblage models of architecture of 34 sand body were established. Channel full sediment (CH) and sandbar (CB) were the main architectural elements in the plane and three hierarchies were divided in the section. The lower part was channel retention sediment (CHL); the middle part was channel full sediment (CH) and channel bar (CB); the lower part was chondro of overbankfine (OF). Also the sedimentary model of 34 sand body was established as aphanitic sandy anastomosed stream. The flow unit of Es234 sand body was divided into three kinds and they are E, M, P. These two models were divided by the diversification of hydrodynamic condition in the lithosomic body and had a fine correspondent relationship. The flow unit and architectural elements which were of the similar reservoir condition, had the same distribution both in plane and space. The distribution of remaining oil which was controlled by the architectural elements was also analyzed. The remaining oil mainly distributes in three places. One is most part of the architecture elements of bad reservoir physical property. The other is the boundary of architecture elements of good reservoir physical property and the boardland of different architectural elements.