鄂尔多斯盆地榆林气田马五_(1+2)气藏不同地质储量计算及采收率评价
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摘要
榆林气田下古生界马五_(1+2)亚段碳酸盐岩气藏,位于鄂尔多斯盆地靖边古潜台东侧,是靖边气田已开发的马五_(1+2)气藏向东的继续扩展,下古生界储层钻遇效果、生产特征显示良好开发潜力。由于储层非均质性较强以及气田开发早期资料不够丰富、井网密度相对较低等原因,导致提交的探明储量存在一定程度的误差。同时,气田在滚动开发过程中,避开了储层薄、物性差区域,故实际动用地质储量与早期提交的探明地质储量存在差异,影响了采气速度、采出程度及采收率等开发指标计算结果的准确性。针对存在的问题,采用多种方法,将气藏划分为相对独立的流动单元,通过落实各流动单元含气面积及储量,扣除了含气面积内未开发区域,核实得到的实际动用地质储量,更加准确可靠。同时,运用多方法计算气井动态地质储量,采用面积加权法与流动单元法计算气田动态地质储量,在此基础上,计算出储量动静比,为准确计算采收率奠定了基础。通过经济评价及气藏工程研究,确定气田废弃产量、废弃地层压力,结合气田动态地质储量及储量动静比,最终确定不同地质储量对应的采收率。对比分析认为:探明地质储量采收率误差大;核实动用地质储量采收率切合实际,具横向可比性;动态地质储量采收率排除了不可渗流的无效储量,更加科学、实用。
Lower Paleozoic carbonatite Ma5_(1+2) gas 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 Ma5_(1+2) gas 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 greaterror.Itismorescientificandpractical 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.
Lower Paleozoic carbonatite Ma5_(1+2) gas 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 Ma5_(1+2) gas 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 greaterror.Itismorescientificandpractical 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.
引文
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[12]Yang Guoping,Hao Yuhong,Wen Kaifeng,et al.Fine division of flow units in Shan32member for the low permeability sandstone gas reservoir in Yulin Gasfield[J].Petroleum Exploration and Development,2017,40(1):44-51.杨国平,郝玉鸿,文开丰,等.榆林气田山32段低渗砂岩气藏流动单元精细划分[J].天然气勘探与开发,2017,40(1):44-51.
[13]Hao Yuhong,Xu Min,Xu Xiaorong.Accurately calculating dynamic reserves of low-permeability gas reservoir[J].Petroleum Exploration and Development,2002,29(5):66-68.郝玉鸿,许敏,徐小蓉.正确计算低渗气藏的动态储量[J],石油勘探与开发,2002,29(5):66-68.
[14]Li Tiancai,Hao Yuhong,Yin Shugen,et al.A new method of determining abandonment condition in Yulin gas reservoir[J].Special Oil and Gas Reservoirs,2006,13(6):52-54.李天才,郝玉鸿,殷树根,等.榆林气田气井废弃条件的确定[J].特种油气藏,2006,13(6):52-54.
[15]Li Zhongxing,Hao Yuhong.Correction of the gas reservoir recovery factor and recoverable reserves estimated by volumetric method[J].Natural Gas Industry,2001,21(2):71-74.李忠兴,郝玉鸿.对容积法计算气藏采收率和可采储量的修正[J],天然气工业,2001,21(2):71-74.Vol.30
[2]Liu Quanyou,Jin Zhijun,Wan Yi,et al.Gas filling pattern in Paleozoic marine carbonate reservoir of Ordos Basin[J].Acta Petrologica Sinica,2012,28(3):847-858.刘全有,金之钧,王毅,等.鄂尔多斯盆地海相碳酸盐岩层系天然气成藏研究[J].岩石学报,2012,28(3):847-858.
[3]Ning Ning,Chen Mengjin,Sun Fenjin,et al.Determination and its significance of ancient oil pools in Ordovician meathering crusting,Ordos Basin[J].Oil and Gas Geology,2007,28(2):280-286.宁宁,陈孟晋,孙粉锦,等.鄂尔多斯盆地奥陶系风化壳古油藏的确定及其意义[J].石油与天然气地质,2007,28(2):280-286.
[4]Liu Zhijun,Lan Yifei,Xia Yong,et al.Dynamic evaluation and horizontal-well development technology for Jingbian Gasfield[J].Natural Gas Exploration&Development,2014,37(3):37-40.刘志军,兰义飞,夏勇,等.靖边气田动态精细评价及水平井开发技术研究与实践[J]天然气勘探与开发,2014,37(3):37-40.
[5]Yang Hua,Fu Jinhua,Wei Xinshan,et al.Characteristics of natural gas reservoirs formation in Ordos Basin[J].Natural Gas Industry,2005,25(4):5-8.杨华,付金华,魏新善,等.鄂尔多斯盆地天然气成藏特征[J].天然气工业,2005,25(4):5-8.
[6]Yan Ningping,Zhang Zonglin,He Yalin,et al.Heterogeneity appraisal of Majiagou 51+2gas reservoir in Jingbian Gasfield[J].Natural Gas Industry,2007,27(5):102-103.晏宁平,张宗林,何亚宁,等.靖边气田马五1+2气藏储层非均质性评价[J],天然气工业,2007,27(5):102-103.
[7]Li Shilin,Lei Bianjun,Zhang Wenji,et al.Study on the main diagenesis of Ma51submember in northeastern Jingbian Gas Field[J].Lithologic Reservoirs,2009,21(1):22-26.李世临,雷卞军,张文济,等.靖边气田东北部马五1亚段主要成岩作用研究[J],岩性油气藏,2009,21(1):22-26.
[8]Shu Zhuangzhi,Du Zhimin,Liu Jianyi,et al.Prediction method of production performance gas wells[J].Natural Gas Industry,2004,24(8):78-81.疏壮志,杜志敏,刘建仪,等.气井生产动态预测方法研究[J],天然气工业,2004,24(8):78-81.
[9]Zhang Wen,Xie Weiguo.Decline analysis methods and performance prediction of gas well production[J].Petrochemical Industry Application,2009,16(4):86-88.张文,解维国.气井产量递减分析方法与动态预测[J],断块油气田,2009,16(4):86-88.
[10]Wang Zuoqian,Huang Shu’nv,He Shunli,et al.New methods of reserves estimation for the Lower Paleozoic carbonate gas reservoir of Jingbian Gas Field[J].Special Oil and Gas Reservoirs,2010,17(6):21-24.王作乾,黄淑女,何顺利,等.靖边气田下古碳酸盐岩气藏储量计算新方法[J].特种油气藏,2010,17(6):21-24.
[11]Shi Yucheng,Chen Mingqiang,Zhang Shenqing,et al.Flow unit method for calculation of single well controlled reserves in low permeability gas field[J].Lithologic Reservoirs,2007,19(4):106-110.史玉成,陈明强,张审琴,等.低渗透气田单井控制储量计算的流动单元方法研究[J],岩性油气藏,2007,19(4):106-110.
[12]Yang Guoping,Hao Yuhong,Wen Kaifeng,et al.Fine division of flow units in Shan32member for the low permeability sandstone gas reservoir in Yulin Gasfield[J].Petroleum Exploration and Development,2017,40(1):44-51.杨国平,郝玉鸿,文开丰,等.榆林气田山32段低渗砂岩气藏流动单元精细划分[J].天然气勘探与开发,2017,40(1):44-51.
[13]Hao Yuhong,Xu Min,Xu Xiaorong.Accurately calculating dynamic reserves of low-permeability gas reservoir[J].Petroleum Exploration and Development,2002,29(5):66-68.郝玉鸿,许敏,徐小蓉.正确计算低渗气藏的动态储量[J],石油勘探与开发,2002,29(5):66-68.
[14]Li Tiancai,Hao Yuhong,Yin Shugen,et al.A new method of determining abandonment condition in Yulin gas reservoir[J].Special Oil and Gas Reservoirs,2006,13(6):52-54.李天才,郝玉鸿,殷树根,等.榆林气田气井废弃条件的确定[J].特种油气藏,2006,13(6):52-54.
[15]Li Zhongxing,Hao Yuhong.Correction of the gas reservoir recovery factor and recoverable reserves estimated by volumetric method[J].Natural Gas Industry,2001,21(2):71-74.李忠兴,郝玉鸿.对容积法计算气藏采收率和可采储量的修正[J],天然气工业,2001,21(2):71-74.Vol.30