标题：Calculation method discussion of tight sandstone gas reserves: a case of volumetric method in SX block
作者：Liu, Zhan-Liang ;Cui, Ming-Ming ;Fan, Ai-Ping ;Lu, Zhong-Qi
作者机构：[Liu, Zhan-Liang ] No.5 Gas Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, China;[Lu, Zhong-Qi ] Changqing Oilfield Company, CNPC, X 更多
来源：Natural Gas Geoscience
摘要：The Sulige Gasfiled in Ordos Basin is a tight sand gas reservoir, and its low porosity, low permeability, and strong heterogeneity increased difficulty of the other calculating methods. Research on the calculation method of tight gas reservoir is of great significance for the rational development of gas reservoir. Here is the volumetric method of tight gas reserve:(1)Based on geological interpretation of logging data, seismic data, core analysis, distribution function curve, experience statistics act and other methods were used to determine the lower limit of porosity and permeability in He8 and Shan1 Formations; (2)Sandbody controlled the reserve area, drilling data and seismic analysis predicted its distribution; (3)Lower limits and four properties standard determined the effective reserve and its thickness; (4) The center temperature and pressure data were used to calculate gas deviation factor and finally the geological reserves were obtained. The reservoir property and gas-bearing area were affected by the deposition and digenesis. The braided river delta develops a set of good reservoir, repeated and overlay migration make a thick-wide distributed sand body. Compaction and cementation inhibit porosity evolution, leading to a lower reservoir properties. Dissolution and fracturing greatly improve reservoir properties and make an impaction to the store and transport of oil and gas. ©, 2014, Science Press. All right reserved.