葫芦河地区长7_1储层特征及评价

The Characteristics and Evaluation of Chang 7_1 Reservoir in Huluhe Area

针对鄂尔多斯盆地葫芦河地区勘探程度较低影响后期开发的问题,综合利用测井、岩石薄片、扫描电镜、X-衍射、粒度分析、压汞测定等资料,对长71储层的岩石学、物性及孔喉特征进行了细致的研究。结果表明:葫芦河地区长71储层属于低孔-特低孔、特低渗-超低渗型储层;岩性主要为细粒岩屑长石砂岩,发育粒间孔和长石溶孔;孔喉结构类型属小孔隙、微细喉道型;储层物性主要受沉积作用和成岩作用的共同影响。根据储层物性及孔隙结构参数,将研究区储层划分为4类,实践证明分类结果与生产情况相符。

In view of the problems of low degree of exploration that affected the later developments in Huluhe Area of Ordos Basin,the date of logging,rock section,scanning electron microscope,X diffraction,grain size analysis and mercury penetration were comprehensively used to study the characteristics of lithology,physical properties and pore throat of Chang 71 Reservoir.The result shows that Chang 71 Reservoir belongs to a low and ultra-low porosity and ultra-low and super-low permeability reservoir,the lithology is fine-grained lithic arkose sandstone,the reservoir mainly developed intergranular pore and dissolved pore of feldspar,the pore throat structure is a type of small pore and micro throat.Sedimentation and diagenesis affect the reservoir properties.Based on the reservoir property and pore structural parameters,the reservoirs in the studied area are divided into 4types,practice demonstrates that the result of classification is consistent with production.