浅水三角洲沉积特征及布井方法——以铁边城地区延8储层为例

Sedimentary Characteristics and Well Spacing Methods of Shallow Water Delta——An Example from Tiebiancheng Area

以铁边城地区侏罗系延安组延8储层为例,分析浅水三角洲的沉积特征。指出该类三角洲的骨架部分由分流河道砂体构成,是铁边城地区侏罗系延安组延8油藏主要储集层。该类砂体储层平面厚度变化大,垂向上相互叠加,开发时对布井要求较高。铁边城地区采用不规则正方形反九点布井方法,在储层变薄变差的砂体边部,适当缩小井距,可规避落空井的风险。

Taking the eighth layer of Jurassic Yan＇an Formation in Tiebiancheng area for example,this paper analyzes sedimentary characteristics of shallow water delta and indicates that the distributors channel sand bodies are the main reservoir strata of the eighth layer of Jurassic Yan＇an Formation in Tiebiancheng area,making up the skeleton of this kind of delta.Since the reservoir plane thickness of this kind of sand bodies varies a lot and the sand bodies superimpose reciprocally in the vertical direction,placing of well is a demanding job while developing this kind of reservoir.Irregular square inverted nine spot well spacing pattern is adopted in Tiebiancheng area,while well spacing is reduced appropriately in the edge of sand body where reservoir is thinned and poorer to evade the risk of stepout well.The drilling success ratio reaches one hundred percent in this area in 2010 and the individual well producing rate of development oil well has as an average of 6.8 tons per day the first three months of this year,as a result,the development effect of the reservoir is preferable.