鄂尔多斯盆地下古生界碳酸盐岩储层分类及气层识别

Carbonate reservoir classification and gas reservoir identification in lower Palaeozoic of Ordos basin

在电成像测井资料分析基础之上,将鄂尔多斯盆地碳酸盐岩储层划分为溶蚀孔洞型、裂缝型、溶蚀孔洞-裂缝型、洞穴型、洞穴-裂缝型5类储层。并对这5类储层常规测井响应特征做了总结,分析认为溶蚀孔洞型、溶蚀孔洞-裂缝型储层含气性最好。针对复杂孔隙结构碳酸盐岩气层识别困难的问题,提出了4种识别气层的方法,应用效果表明,单因素测井参数交会图识别气层能力有限,复合参数交会图能够较准确地识别出气层,可以进一步推广应用。

Based on logging data analysis of electric imaging,the carbonate reservoirs in Ordos basin can be divided into karst holes,cracks,solution pores-fracture and cave,the cavefractured-vuggy 5 classes reservoir,and the summarization on the conventional logging response characteristics of the five kinds of reservoirs have been made.The analysis results indicate the gas-bearing characteristic of solution pores and solution pores-fractured- vuggy reservoir hydrocarbon content is the best.Aiming at the difficulty of gas reservoir identification in complex carbonate reservoir pore structure,four kinds of identification methods have been provided.The application effects indicate the identification ability of the single factor gas logging crossplot parameters is limited,while the composite parameters crossplot can accurately identify the atmosphere,and therefore,it is of further popularization and application.