Reservoir Pore Structure Characteristics and Classification for the Upper Subformation of Jiamuhe Formation of Block-8 in Karamay Oilfield
详细信息
- 责任者：He Changpo (No.2 Production Plant ; Xinjiang Oilfield Company ; PetroChina ; Karamay 834008 ; China) ; Yang Li
- 刊名：Xinjiang Oil & Gas
- 出版年：2013
- 卷期：9(3)
- 页码：p.5-9,4
- issnNo：ISSN1673-2677
- isbnNo：CN65-1253/TE
摘要
Pore structure has an important effect on porosity and permeability of reservoir.Whether in the oil gas secondary migration of oil and gas during the two flooding in the pore formation water,or oil and gas in the process of developing from the pores are flooding out,they are affected by the pore structure.Using thin section identification,mercury intrusion analysis,scanning electron mictoscope test technology of Karamay Oilfield,block 8 JiaMuHe group reservoir microscopic characteristics of pore structure are studied in detail.Research results show that,Block 8 on the subgroup of JiaMuHe reservoir overall belongs to medium porosity and low permeability and extra-low permeability reservoir,The pores mainly belong to original intercrystal pores,intragranular dissolved pores,cements in dissolution pores,with small,fine throat,and throat sorting is relatively poor with relatively poor heterogeneity and poor connectivity in general.Based on all kinds of characteristic parameters of pore structure correlation annlyses,chosing effective porosity and permeability as the main classification of pore structure patameters in block 8 of the upper formation of JiaMuHe formation,the classifications of pore structure of the reservoir are divided into three categories,five sub-categories,in which,pore structure of class I-1 subclass reservoir is optimal,class II is in lower middle and the pore structure of class III reservoir is very poor.