致密砂岩储层水平井开发地质下限研究——以鄂尔多斯盆地L区块盒8储层为例

Research on Lower Limit of Geological Parameters of Tight Sandstone Reservoir by Horizontal Well Development: Taking He 8 Formation of Block L in Ordos Basin as an Example

为了明确鄂尔多斯盆地L区块盒8储层水平井开发地质下限,寻找适合水平井高效开发有利区,采用经济极限产量法,利用水平井单井投资成本、气井产气量等参数,对研究区水平井进行经济评价,并与致密砂岩储层实际地质特征相结合,建立适合鄂尔多斯盆地L区块水平井有效开发的储层厚度、物性、含气性和电性下限标准,为致密砂岩气藏水平井高效开发提供依据。结果表明:研究区经济极限渗透率为0.28×10^(-3)μm^2,经济极限孔隙度为8.85%,含气饱和度下限为53.4%,声波时差下限为230μs/m,电阻率下限为29.5Ω·m,密度下限为2.55 g/cm^3,泥质含量下限为14%。

In order to determine the lower limits of geologic parameters for the horizontal well efficient development of the He 8 forma- tion of Block L in Ordos Basin and find favorable areas, the standards for reservoir thickness, physical property, gas content and electrical property which is suitable for horizontal well development oflhe block are established using economic limit production method based on the single well investment cost and gas production capacity of horizontal well and the actual geological characteristics of tight sand- stone reservoir,which provides a theoretical basis for the horizontal well efficient development of tight sandstone gas reservoirs. The resuits show that the economic limit permeability of the study area is 0.28 × 10-3 μm2 , the economic limit porosity is 8.85% , the lower limit of gas saturation is 53.4%, the lower limit of acoustic slowness is 230 μs/m, the lower limit of resistivity is 29.5 Ω·m , the lower limit of density is 2.55g/cm3 , and the lower limit of shale content is 14%.