鄂尔多斯盆地A地区长8储层测井分析

A study on the logging interpretation for reservoir from Chang 8 in the Baibao District of Ordos Basin

目的研究鄂尔多斯盆地A地区长8储层测井解释标准。方法对A地区长8储层测井、录井、岩心和试油等资料进行收集、整理、校正、分析。结果明确了该区储层的岩性、物性、含油性和电性特征及其相互关系,建立了适合本区的孔隙度、渗透率和含油饱和度解释方法。同时,在结合试油资料的基础上,经过统计分析,确定出了该区的油水层电性识别标准及有效厚度下限值。孔隙度的下限为7%,渗透率的下限为0.1×10^(-3)μm^2,声波时差下限为211μs/m,有效厚度的起算值为0.4 m。结论A地区长8储层四性关系较明显,钾长石含量少和地层水矿化度低是自然电位对岩性分辨能力差的根本原因。

Aim To study the logging interpretation for reservoir from Chang 8 in the Baibao District of Ordos Basin. Methods Based on the collection, coordination, revise and analyze well logging, log, bore core, production test datum at reservoir of Chang 8. Results It has made clear the characteristic of lithology, physical property, oiliness and electrical property and the relation of four of them at reservoir of Chang 8. And then, established interpretation plate of porosity, permeability and oil saturation that suit to the reservoir. And according to the datum of production test, distinguished criterion water-oiled electrical property and lower limit of validity thickness have been identified. The lower limit of porosity is 7% , permeability is 0. 1 ×10^-3 μm^2, acoustic slowness is 211 μs/m, validity thickness is 0. 4 m. Conclusion The four property relationship of Chang 8 reservior in A District is comparatirely obvious, the small content of potassic feldspar and low salinity of formation water are the ultimate reasons which lead to the low level of sp＇s resolving ability to lithology.