南鲍金根油田侏罗系油藏气测录井资料解释及特征分析
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摘要
南鲍金根油田矿权区处于鲍金根构造南部相对较低部位,油气层处于油水过渡带附近,均不同程度地与边底水相关。应用气测录井资料,解释了南鲍金根油田各含油层组的储集层性质,并分析了每个油层组在气测录井解释参数方面的特征;基于气测录井组分比值的皮克斯勒图板指数法、三角形图板指数法以及综合气体指数法,通过分析曲线图以及交会图板反映油藏伴生气组分变化细节,区分不同性质的储集层流体性质,指示油水界面,并识别油气层中次生作用的存在;通过特征参数对比,反映出南鲍金根油田油藏次生作用程度依次是Ⅵ油层组>Ⅰ油层组>Ⅱ油层组、Ⅲ油层组>Ⅳ油层组。从气体比值特征看,尚有规律可循,虽然有次生作用影响气测组分,但各油层组气测组分均以热裂解烃为主;发生次生作用的油藏气测组分比值特征是I_4+I_5的值相对显著升高,这种现象是判断油气层是否存在次生作用的一个重要标志。气测录井资料不仅能评价储集层性质,还能在油藏评价中发挥重要作用,这方面的研究值得进一步挖掘。
The mineral right area of the south Bozingen Oilfield is located in the lower part of the southern part of Bozingen structure,and the hydrocarbon reservoirs are near the oilwater transition zone,which are related to the edge and bottom water to varying degrees.By using gas logging data,the reservoir properties of various oil-measures in the south Bozingen Oilfield are explained,and the characteristics of each oil formation in gas logging interpretation parameters are analyzed.Pixler chart index method,triangle chart index method and comprehensive gas index method based on gas logging component ratio are used in this paper.The diagrams and intersection charts reflect the variation details of associated gas components,distinguish the fluid properties of different reservoirs,indicate the oil-water interface,and identify the existence of secondary action in hydrocarbon reservoirs.The correlation of characteristic parameters shows that the secondary action degree of the reservoirs in the south Bozingen Oilfield is Ⅵ oil-bearing layer,Ⅰoil-bearing layer,Ⅱoilbearing layer in the sequence from strong to weak,the secondary action ofⅢ oil-bearing layer is stronger than that ofⅣoil-bearing layer.Judging from the characteristics of gas ratio,there are still rules to be followed.Although secondary action affects gas logging components,thermal cracking hydrocarbons are the main gas logging components of each oilbearing layer.The gas logging component ratio of secondary reservoirs is characterized by a relatively significant increase in the value of I4+I5,which is an important indicator of the existence of secondary effects in oil and gas reservoirs.Gas logging data can not only evaluate reservoir properties,but also plays an important role in reservoir evaluation,which deserves further exploration.
The mineral right area of the south Bozingen Oilfield is located in the lower part of the southern part of Bozingen structure,and the hydrocarbon reservoirs are near the oilwater transition zone,which are related to the edge and bottom water to varying degrees.By using gas logging data,the reservoir properties of various oil-measures in the south Bozingen Oilfield are explained,and the characteristics of each oil formation in gas logging interpretation parameters are analyzed.Pixler chart index method,triangle chart index method and comprehensive gas index method based on gas logging component ratio are used in this paper.The diagrams and intersection charts reflect the variation details of associated gas components,distinguish the fluid properties of different reservoirs,indicate the oil-water interface,and identify the existence of secondary action in hydrocarbon reservoirs.The correlation of characteristic parameters shows that the secondary action degree of the reservoirs in the south Bozingen Oilfield is Ⅵ oil-bearing layer,Ⅰoil-bearing layer,Ⅱoilbearing layer in the sequence from strong to weak,the secondary action ofⅢ oil-bearing layer is stronger than that ofⅣoil-bearing layer.Judging from the characteristics of gas ratio,there are still rules to be followed.Although secondary action affects gas logging components,thermal cracking hydrocarbons are the main gas logging components of each oilbearing layer.The gas logging component ratio of secondary reservoirs is characterized by a relatively significant increase in the value of I4+I5,which is an important indicator of the existence of secondary effects in oil and gas reservoirs.Gas logging data can not only evaluate reservoir properties,but also plays an important role in reservoir evaluation,which deserves further exploration.
引文
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[2] 于浩业,赵卫军,欧亚平,等. 鲍金根地堑断裂坡折带油气藏特征及有利勘探区[J]. 新疆石油地质,2016,37(4):494-498. YU Haoye,ZHAO Weijun,OU Yaping,et al. Petroleum reservoir characteristics and favorable exploration areas in faulted slope-break zone of Bozingen graben,Kazakhstan[J]. Xinjiang Petroleum Geology,2016,37(4):494-498.
[3] 冉怀江. 南图尔盖盆地萨雷布拉克地区侏罗系沉积层序及地层不整合圈闭[J]. 岩性油气藏,2015,27(2):6-12. RAN Huaijiang. Sedimentary sequence and stratigraphic unconformity trap of Jurassic in Sarybulak area,South Turgai Basin[J]. Lithologic Reservoirs,2015,27(2):6-12.
[4] 余明发. 气测录井资料皮克斯勒解释图板的拓展应用[C]//2011年度中国石油工业录井技术交流会论文集.青岛:中国石油大学出版社,2012. YU Mingfa. Extended application of Pixler interpretation chart for gas logging data[C].//Proceedings of the 2011 China Petroleum Industry mud Logging Technology Exchange Conference. Qingdao:China University of Petroleum Press,2012.
[5] 余明发,边环玲,庄维,等. 气测录井皮克斯勒图板解释方法适用性解析[J]. 录井工程,2013,24(1):14-19. YU Mingfa,BIAN Huanling,ZHUANG Wei,et al. Applicability analysis of interpretation method for gas logging Pixler chart[J]. Mud Logging Engineering,2013,24(1):14-19.
[6] 余明发,孙越,吴国海,等. 常规气测录井资料解释中皮克斯勒曲线的应用方法[J]. 录井工程,2014,25 (1):48-54. YU Mingfa,SUN Yue,WU Guohai,et al. Application method of Pixler curve in interpretation of conventional gas logging data[J]. Mud Logging Engineering,2014,25(1):48-54.
[7] 姚汉光. 国外使用的一些气测录井解释方法[C]//录井技术文集.北京:石油工业出版社,1999. YAO Hanguang. Some gas logging interpretation methods used abroad[C]//Mud Logging Technology Anthology. Beijing:Petroleum Industry Press,1999.
[8] 余明发,郭海峰,庄维,等. 常规气测录井综合气体指数解释法的建立及其在油气储层解释中的应用[J]. 石油天然气学报, 2017, 39(4):18-28. YU Mingfa,GUO Haifeng,ZHUANG Wei,et al. The establishment of comprehensive gas index interpretation method for conventional gas logging and its application in hydrocarbon reservoir interpretation[J]. Journal of Oil and Gas Technology,2017,39(4):18-28.
[9] 余明发,吴国海,简笑鹰,等. 气测录井三角形图板法的解析及拓展应用尝试[J]. 录井工程, 2015,26(3):17-23. YU Mingfa,WU Guohai,JIAN Xiaoying,et al. Analysis and extended application of triangle method for gas logging[J]. Mud Logging Engineering,2015,26(3):17-23.