致密砂岩储层裂缝型'甜点'的随钻识别方法

摘要

The fracture type "sweet spot" in tight sandstone reservoir is the primary target area.In order to make the identification and development degree description of the fracture type " dessert" more timeliness and accu-racy, based on measuring the difference of drillability caused by different rock strength between basement rock and" sweet spot" zones, the way to identify " sweet spot" in drilling can be got by the dc index method.By the way, fracture development coefficient was defined, which can be used to describe the development degree of " sweet spot" .This method was applied successfully in Cretaceous layer's three wells of Kuqa Depression.It provides a ref-erence for timely and accurate detection and the description of development degree about fracture type " sweet spot"in tight sandstone reservoirs.%致密砂岩储层裂缝型"甜点"的开发存在很大潜力,为了使裂缝型"甜点"的识别和发育程度描述更具及时性而不失准确性,基于分析基质岩石与裂缝型"甜点"区域岩石的物理性质差异,可以通过度量岩石强度不同所导致的可钻性差异来识别裂缝型"甜点",从而提出应用dc指数法对裂缝型"甜点"进行随钻识别,并定义了裂缝发育系数的概念,结合不同裂缝识别方法利用裂缝发育系数对裂缝型"甜点"的发育程度进行描述.将该方法成功运用于库车坳陷白垩系目的层的三口探井,为致密砂岩储层裂缝型"甜点"的及时准确发现与发育程度描述提供了借鉴作用和依据.