The evaluation and calculation of different geological reserves and recovery ratio of Ma5<sub>1+2&nbsp;</sub> gas reservoir in Yulin Gasfield of Ordos Basin

Wen Kai-feng, Yang Guo-ping, Gao Jun-wei, Hao Yu-hong, Bai Hui, Zhang Yin-de, Ye Cong-lin, Sun Long

doi:10.11764/j.issn.1672-1926.2018.09.016

2019 , Vol. 30 >Issue 2: 266 - 273

DOI: https://doi.org/10.11764/j.issn.1672-1926.2018.09.016

The evaluation and calculation of different geological reserves and recovery ratio of Ma5₁₊₂ gas reservoir in Yulin Gasfield of Ordos Basin

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1.No.2 Gas Production Plant of PertroChina Changqing Oilfield Company,Yulin 719000,China；
2.Sulige Gas Field Research Center of PertroChina Changqing Oilfield Company，Xi’an 710018,China；
3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China

Received date: 2017-09-09

Revised date: 2018-09-27

Online published: 2019-03-11

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Abstract

Lower Paleozoic carbonatite Ma5₁₊₂gas reservoirs in Yulin Gasfield,located on the east side of Jingbian ancient submarine platform of Ordos Basin,which is the expanded part of the developed Ma5₁₊₂gas reservoir in the Jingbian Gasfield.Under the effect of drilling and the production characteristics,the Lower Paleozoic reservoir shows good development potential.Because the heterogeneity of reservoir is strong,the data of early gas field is not rich enough,and the density of well pattern is relatively low.There is a certain degree of error in the proven reserves.At the same time,it is in the process of rolling development of the gas field.Because avoided the thin reservoir and the poor physical property,the actual use of geological reserves and the early submission of the proven geological reserves are different.This will influence the accuracy of the calculation results of the development index of gas recovery rate,recovery degree,recovery ratio and so on.In view of the problem,many methods are adopted to separate gas reservoirs into relatively independent flow units.By carrying out the gas-bearing area and reserves of each flow unit,it is more accurate and reliable to verify the actual geological reserves obtained by excluding the undeveloped area in the gas-bearing area.The dynamic reserves of gas wells are calculated by using many methods.The dynamic reserves of gas fields are calculated by area weighted method and flow unit method.On the basis of this,the dynamic ratio of reserves is calculated,which lays a foundation for accurate calculation of gas recovery.According to the economic evaluation and gas reservoir engineering research,the waste gas and waste formation pressure will be confirmed in the gas field.Combined with the dynamic reservesand its ratio for the geological reserves,the recovery of the different geological reserves will be calculated finally.Through comparison and analysis,the geological reserves ratio are proved to be of great error.It is more scientific and practical to verify the geological reserves ratio to be practical,to have lateral comparability.The dynamic geological reserve ratio excluded the ineffective reserves of non-seepage,which is more accurate and reliable.

Key words： Yulin Gasfield; Carbonatite gas reservoirs; Flow units; Producing geological reserves; Dynamic geological reserves; Recovery ratio

Cite this article

Wen Kai-feng, Yang Guo-ping, Gao Jun-wei, Hao Yu-hong, Bai Hui, Zhang Yin-de, Ye Cong-lin, Sun Long . The evaluation and calculation of different geological reserves and recovery ratio of Ma5₁₊₂ gas reservoir in Yulin Gasfield of Ordos Basin[J]. Natural Gas Geoscience, 2019 , 30(2) : 266 -273 . DOI: 10.11764/j.issn.1672-1926.2018.09.016

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