长庆气田可动地层水特征及意义
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摘要
长庆气田的出水层主要分布于马五1段 ,根据测井检测数据 ,可分为产水不产气、气水同产及产气不 (少 )产水型。表面上看 ,长庆气田马五1储层的地层水呈块状或透镜状分布 ,无连片水体。实际上 ,该区地层水并非完全独立 ,气藏中不存在“边水”或“底水” ,找不到绝对的气水边界 ,只存在一些相对富集的区域 ,即相对富水区。通过利用地震、测井资料对地层水横向追踪 ,发现该区存在约 2 0个相对富水区。大面积气区中气井出水 ,并不影响气的产出 ,在相对富水区边缘 ,由于出水采气导致水体与井底压差增大 ,可能造成气井很快出水且水量急增 ,但可通过控制生产压差 (<3MPa)或采用排水恢复产气。
The water out reservoirs of Changqing Gasfields are mainly distributed in Ma 5 1 submember.The reservoirs could be divided into water producing,water gas producing and gas producing types.The formation water of the reservoirs appeared to be lenticular discontinuous water bodies,but actually there is no boundary between gas and water,no fringe water and bottom water.20 water enriched areas could be found through lateral formation water tracing by using well log and seismic data.It is considered that the water of gas wells in large gas bearing areas would not influence gas producing;in marginal positions of water enriched areas,it is necessary to control producing pressure drop(<3 MPa)or to dewater so as to restart production.
The water out reservoirs of Changqing Gasfields are mainly distributed in Ma 5 1 submember.The reservoirs could be divided into water producing,water gas producing and gas producing types.The formation water of the reservoirs appeared to be lenticular discontinuous water bodies,but actually there is no boundary between gas and water,no fringe water and bottom water.20 water enriched areas could be found through lateral formation water tracing by using well log and seismic data.It is considered that the water of gas wells in large gas bearing areas would not influence gas producing;in marginal positions of water enriched areas,it is necessary to control producing pressure drop(<3 MPa)or to dewater so as to restart production.
引文
何自新,吕运能,王允诚,等陕甘宁盆地中部气田马五1储层开发评价研究1995
1 徐国盛,宋焕荣,周文鄂尔多斯盆地中部气田水化学条件与天然气聚集[J]石油实验地质,2000,22(4):330～335
2 徐国盛,匡建超长庆气田中区马五14储层流体识别及天然气富集规律研究[J]成都理工学院学报,1994,26(2):142～148
3 覃建雄,徐国盛鄂尔多斯盆地下奥陶统碳酸盐岩储层深埋次生孔隙研究[J]西安石油学院学报,1995,10(4):9～14
4 陆正元,陈立官,王洪辉四川盆地下二叠统气藏储层模式的再认识[J]石油与天然气地质,1999,20(1):11～14
1 徐国盛,宋焕荣,周文鄂尔多斯盆地中部气田水化学条件与天然气聚集[J]石油实验地质,2000,22(4):330～335
2 徐国盛,匡建超长庆气田中区马五14储层流体识别及天然气富集规律研究[J]成都理工学院学报,1994,26(2):142～148
3 覃建雄,徐国盛鄂尔多斯盆地下奥陶统碳酸盐岩储层深埋次生孔隙研究[J]西安石油学院学报,1995,10(4):9～14
4 陆正元,陈立官,王洪辉四川盆地下二叠统气藏储层模式的再认识[J]石油与天然气地质,1999,20(1):11～14
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