苏里格气田苏77区块气藏评价技术及应用效果
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摘要
鄂尔多斯盆地苏里格气田主力气层下二叠统山西组山2段、山1段以及下石盒子组盒8段属于砂岩岩性气藏,具有"低孔、低渗、低丰度且非均质性强"等特点,气田规模开发存在较大难度。为此,在勘探程度较低的新区块规模开发前期,开展有针对性的评价工作,寻找含气相对富集区就显得尤为重要。苏77区块在开发前期针对区块面临的地震测网稀、井控程度低、区块内尚未提交任何级别储量、局部存在富水区、单井产能不落实、区块地质认识有待进一步深化等主要问题,开展了地震、评价井及开发试验等方面的开发评价工作。采用"地震—地质相结合"的技术思路,通过二维地震测线控制,结合评价井钻探及沉积相、成岩作用、储层综合评价研究成果,评价河道发育带,预测有效储层分布,进而筛选出含气富集区。2010—2011年在筛选的含气富集区内集中进行产能建设,完钻开发井Ⅰ+Ⅱ类井比例大幅度提高,开发效果良好。该区块开发实践表明所运用的开发前期评价技术行之有效,值得同类型气藏开发评价借鉴。
The 1st and 2nd members of the Permian Shaanxi Formation and the 8th member of the Permian Shihezi Formation,as the major gas pay zones of the Sulige Gas Field,Ordos Basin,are sandstone gas reservoirs characterized by low porosity,low permeability,low abundance,and strong heterogeneity.Therefore,it is challenging for the commercial development of this field.It is particularly important to find sweet spots through evaluation at the initial stage of scaled development of new blocks with relatively low exploration maturity.Therefore,in the early period of the development of Block Su-77,various problems were thoroughly analyzed such as sparse seismic grid,low degree of well control,no registered gas reserves,local occurrence of water layers,uncertain single well productivity,and unclear geological conditions.On this basis,the development evaluation of this block was performed through seismic acquisition and interpretation,exploratory well drilling,and development pilot tests.Additionally,seismic data and geological data were integrated to identify channel sandbodies and predict effective reservoirs,so as to delineate the gas zones with high potential.The proportion of development wells of typeⅠand Ⅱ in the total wells drilled in 2010 and 2011 increased by a big margin.The results show that these evaluation techniques are effective and can be applied to other similar gas reservoirs.
The 1st and 2nd members of the Permian Shaanxi Formation and the 8th member of the Permian Shihezi Formation,as the major gas pay zones of the Sulige Gas Field,Ordos Basin,are sandstone gas reservoirs characterized by low porosity,low permeability,low abundance,and strong heterogeneity.Therefore,it is challenging for the commercial development of this field.It is particularly important to find sweet spots through evaluation at the initial stage of scaled development of new blocks with relatively low exploration maturity.Therefore,in the early period of the development of Block Su-77,various problems were thoroughly analyzed such as sparse seismic grid,low degree of well control,no registered gas reserves,local occurrence of water layers,uncertain single well productivity,and unclear geological conditions.On this basis,the development evaluation of this block was performed through seismic acquisition and interpretation,exploratory well drilling,and development pilot tests.Additionally,seismic data and geological data were integrated to identify channel sandbodies and predict effective reservoirs,so as to delineate the gas zones with high potential.The proportion of development wells of typeⅠand Ⅱ in the total wells drilled in 2010 and 2011 increased by a big margin.The results show that these evaluation techniques are effective and can be applied to other similar gas reservoirs.
引文
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[2]何东博,贾爱林.苏里格气田储集层成岩作用及有效储集层成因[J].石油勘探与开发,2004,31(3):69-71.
[3]史松群,程思检.苏里格气田二维多波地震技术[J].天然气工业,2008,28(增刊2):31-36.
[4]蒋家钰,鄂尔多斯盆地储层横向预测技术[M].北京:石油工业出版社,2005.
[5]李会军,张文才,朱雷.苏里格气田优质储层控制因素[J].天然气工业,2007,27(12):16-18.
[6]李安琪,杨勇,卢涛,等.苏里格气田储层主控因素及相对含气富集区筛选[J].天然气工业,2008,28(增刊2):5-8.
[7]邹新宁,孙卫,王大兴,等.苏里格气田盒8段低渗砂岩储层的预测[J].石油物探,2005,44(6):621-626.
[8]张明禄,达世攀,陈调胜.苏里格气田二叠系盒8段储集层的成岩作用及孔隙演化[J].天然气工业,2002,22(6):13-16.
[9]高星,陈洪德,朱平,等.苏里格气田西部盒8段储层成岩作用及其演化[J].天然气工业,2009,29(3):17-20.
[10]张啸枫,唐俊伟,位云生,等.苏里格气田单井生产动态分析与管理[J].西南石油大学学报:自然科学版,2009,31(3):110-114.
[11]王峰,田景春,陈蓉,等.苏里格地区上古生界盒8砂岩储层控制因素[J].成都理工大学学报:自然科学版,2009,36(4):367-372.
[12]吕强,赵俊兴,朱平,等.苏里格气田西部山1段储层特征及影响因素[J].天然气工业,2009,29(3):13-16.
[13]兰朝利,何顺利,门成全,等.苏里格气田开发选区技术探讨[J].西南石油大学学报,2008,30(4):89-92.
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