R/S分析方法在储层裂缝预测中的应用——以定边东仁沟长7~3储层为例

Application of R/S Analysis Method in Reservoir Fracture Prediction--A Case Study of Chang-73 Reservoir in Dingbian Dongrengou

定边东仁沟区块为典型的超低孔、超低渗透油藏,有效识别储层裂缝对油藏高效开发意义重大。为准确预测储层裂缝,针对常规测井曲线识别裂缝准确度低的问题,运用R/S分析方法,对东仁沟区块长7~3储层139口油井的声波时差数据进行分析,确定了东仁沟区块裂缝发育井的分形维数等值图界限值为1.15;利用裂缝相对发育井点绘制分形维数等值线图,预测得到东仁沟区块长7~3储层的裂缝相对发育区主要集中在中北部,东南部次之,其他区域零星分布,裂缝发育区呈条带状分布,以北东—南西向裂缝为主。裂缝发育区的识别与预测对东仁沟长7~3储层综合评价和开发技术政策制定有一定的指导作用。

The block of Dingbian Dongrengou is a typical ultra-low porosity and ultra-low permeability reservoir. To accurately predict reservoir fractures, solving the problem of low crack accuracy in identifying traditional logging curves, the acoustic time difference data of 139 oil wells in Chang-73 reservoir of Dongrengou block were analyzed by using the R/S analysis method, and the fractal dimension of the fracture development well in Dongrengou block was determined to be 1.15. Using the fracture relative to the development well points to draw the fractal dimension contour map, it is predicted that the relative developmental zones of Chang-73 reservoir in Dongrengou block are mainly concentrated in the central and northern parts, followed by the southeast, and scattered in other areas, and the fracture development zone is distributed in strips, with northeast-southwestern fractures as the main. The identification and prediction of the fracture development zone has a certain guiding role for the comprehensive evaluation and development technology policy formulation of Chang-73 reservoir of Dongrengou block.