盖层封盖能力对天然气聚集的影响-以鄂尔多斯盆地大牛地气田大12井区为例

doi:10.11743/ogg20110610

摘要/Abstract

摘要：

针对大牛地气田生产过程中出现的纵向和平面产能差异大的问题,以岩心、分析化验和测井资料为基础,通过对盖层封闭机理及封闭能力对天然气富集影响分析,发现研究区盖层属于致密泥岩层与欠压实泥岩层相互叠置形成的超压封闭盖层,盖层封闭能力受正常压实的泥岩与欠压实泥岩共同控制;针对两种封闭机理分别选择盖层厚度、总孔隙度、含砂量和异常孔隙流体压力参数对盖层进行评价。评价结果表明:盖层封闭能力与储层平均试采无阻流量和最大试采无阻流量具有正相关关系;下石盒子组三段在区域盖层的封闭下成为主力产气层段,其高产气区主要集中在研究区的西部边缘,其他目的层段受制于直接盖层封闭能力,含气丰度较低,平面分布比较零散,均未形成大规模连片的含气区,这正是研究区产能受限的关键所在。

关键词: 盖层, 封闭机理, 天然气, 大牛地气田, 鄂尔多斯盆地

Abstract:

In view of the large variations of production capacity both vertically and laterally in Daniudi gas field,this paper analyzed the influences of the caprock sealing mechanism and capability on natural gas accumulation by cores,laboratory test and logging data.The result indicates that the caprocks are overpressure sealing caprocks consisting of interbedded tight mudstone and undercompacted mudstone.The sealing capability is jointly controlled by the normal compacted mudstone and uncompacted mudstone.Thickness,total porosity,gross-to-net ratio and abnormal pore fluid pressure are selected as parameters to assess the sealing capacity of caprocks.The sealing capability is in positive correlation with the tested average open flow capacity and the maximum open flow capacity.The 3rd member of Xiashihezi Formation is the main gas pay zone thanks to the regional caprocks,and the high yield area is located on the western edge of the study area.The other pay zones are controlled by the sealing ability of direct caprocks,their gas are too scattered with low abundance to form large-scale contig- uous gas-bearing areas which is a key factor limiting productivity in the D-12 wellblock.

Key words: caprock, sealing mechanism, natural gas, Daniudi gas field, Ordos Basin

中图分类号:

TE112.25

张文旗,王志章,侯秀林,等. 盖层封盖能力对天然气聚集的影响-以鄂尔多斯盆地大牛地气田大12井区为例[J]. 石油与天然气地质, 2011, 32(6): 882-889. doi: 10.11743/ogg20110610 Zhang Wenqi,Wang Zhizhang,Hou Xiulin,et al. Influences of caprock sealing capacity on natural gas accumulation: an example from D-12 wellblock of Daniudi gas field in Ordos Basin[J]. Oil & Gas Geology, 2011, 32(6): 882-889. doi: 10.11743/ogg20110610

参考文献

[1] 吕延防,付广,于丹.中国大中型气田盖层封盖能力综合评价及其对成藏的贡献[J].石油与天然气地质,2005,26(6):742-745,753. Lü Yanfang,Fu Guang,Yu Dan.Comprehensive evaluation of sealing ability of cap rock in China＇s large and medium gas fields and their contribution to gas accumulation[J].Oil & Gas Geology,2005,26(6):742-745,753. [2] 付广,陈章明,姜振学.盖层封堵能力评价方法及其应用[J].石油勘探与开发,1995,22(3):46-50. Fu Guang,Chen Zhangming,Jiang Zhenxue.Evaluation of the sealing ability of cap rock and its application[J].Petroleum Exploration and Development,1995,22(3):46-50. [3] 张立含,周广胜.气藏盖层封气能力评价方法的改进及应用-以我国46个大中型气田为例[J].沉积学报,2010,28(2):388-394. Zhang Lihan,Zhou Guangsheng.Improvement and application of the methods of gas reservoir cap sealing ability[J].Acta Sedimentologica Sinica,2010,28(2):388-394. [4] 吕延防,张绍臣,王亚明.盖层封闭能力与盖层厚度的定量关系[J].石油学报,2000,21(2):27-30. Lü Yanfang,Zhang Shaochen,Wang Yaming.Research of quantitative relations between sealing ability and thickness of cap rock[J].Acta Petrolei Sinica,2000,21(2):27-30. [5] 付广,付晓飞,孟庆芬.用声波时差研究泥岩盖层毛细管封闭能力[J].石油物探,2003,42(2):261-264 Fu Guang,Fu Xiaofei,Meng Qingfen.Research of capillary seal ability and its formation period of mudstone cap rock with acoustic transit time[J].Geophysical Prospecting for Petroleum,2003,42(2):261-264. [6] 薛永超,程林松,付广.大庆长垣以东地区登二段泥质岩盖层封气能力综合评价[J].吉林大学学报(地球科学版),2005,35(5):626-630. Xue Yongchao,Cheng Linsong,Fu guang.Comprehensive evaluation of gas sealing ability of the lower Denglouku formation (K1d2) mudstone cap-rock in the east of the Daqing placanticline[J].Depression Journal of Jilin University(Earth Science Edition),2005,35(5):626-630. [7] 赵长举.大牛地气田上古生界储盖组合测井分析[J].测井技术,2005,29(4):345-347. Zhao Changju.Log interpretation of reservoir & cap rock in upper Palaeozoic in Daniudi gas field[J].Well Logging Technology,2005,29(4):345-347 [8] 李良,袁志祥,惠宽洋,等.鄂尔多斯盆地北部上古生界天然气聚集规律[J].石油与天然气地质,2000,21(3):268-271. Li Liang,Yuan Zhixiang,Hui Kuanyang,et al.Accumulationre gularity of Upper Paleozoic gas in north Ordos basin[J].Oil & Gas Geology,2000,21 (3):268-271. [9] 郝蜀民,惠宽洋,李良.鄂尔多斯盆地大牛地大型低渗气田成藏特征及其勘探开发技术[J].石油与天然气地质,2006,27(6):762-768. Hao Shumin,Hui Kuanyang,Li Liang.Reservoiring features of Daniudi low-permeability gas field in Ordos basin and its exploration and development technologies[J].Oil & Gas Geology,2006,27(61):762-768. [10] 陈昭佑,王光强.鄂尔多斯盆地大牛地气田山西组砂体组合类型及成因模式[J].石油与天然气地质,2010,31(5):632-639. Chen Zhaoyou,Wang Guangqiang.Assemblage types and genetic models of the Shanxi sandbodies in Daniudi gasfield,the Ordos Basin[J].Oil & Gas Geology,2010,31(5):632-639. [11] 付广.泥岩盖层的超压封闭演化特征及封气有效性[J].大庆石油学院学报,2007,31(5):7-9. Fu Guang.Seal evolution characteristics of overpressured mudstone and its seal efficiency[J].Journal of Daqing Petroleum Institute,2007,31(5):7-9. [12] 谭增驹,刘洪亮.应用测井资料评价吐哈盆地盖层物性封闭[J].测井技术,2004,28(1):41-44. Tan Zengju,Liu Hongliang.Evaluation of trap properties of capping beds in Tuha basin using log data[J].Well Logging Technology,2004,28(1):41-44. [13] 李国平.天然气封盖层研究与评价[M].北京:石油工业出版社,1996. Li Guoping.Research and evaluation of natural gas seal layer[M].Beijing:Petroleum Industry Press,1996. [14] 杨华,张军,王飞雁,等.鄂尔多斯盆地古生界含气系统特征[J].天然气工业,2000,20(6):7-11. Yang Hua,Zhang Jun,Wang Feiyan,et al.Characteristics of Paleozoic gas system in e'erduosi basin[J].Natural gas industry,2000,20(6):7-11. [15] 郝蜀民,李良,尤欢增.大牛地气田石炭-二叠系海陆过渡沉积体系与近源成藏模式[J].中国地质,2007,38(4):606-610. Hao Shumin,Li Liang,You Huanzeng.Permo-Carboniferous paralic depositional systems in the Daniudi gas field and its near-source box-type gas accumulation-forming model[J].Geology in China,2007,38(4):606-610. [16] 闵琪,付金华,席胜利,等.鄂尔多斯盆地上古生界天然气运移聚集特征[J].石油勘探与开发,2000,27(4):26-29. Min Qi,Fu Jinhua,Xi Shengli,et al.Characteristics of natural gas migration and accumulation in the Upper Paleozoic of Ordos basin[J].Petroleum Exploration and Development,2000,27(4):26-29. [17] 赵林,夏新宇,戴金星.鄂尔多斯盆地上古生界天然气的运移与聚集[J].地质地球化学,2000,28(3):48-53. Zhao Lin,Xia Xinyu,Dai Jinxing.Migration and accumulation of natural gases in Upper Paleozoic Ordos basin[J].Geology-Geochemistry,2000,28(3):48-53.