有效耗水区间在东营凹陷地层中的确定及地质意义
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摘要
沉积物在埋藏压实过程中,不仅发生矿物蚀变耗水作用,同时也发生地层压实排水作用和黏土矿物转化脱水作用。通过对东营凹陷深部地层压实排水量和黏土矿物转化脱水量的计算,将同深度段地层总增水量与耗水量进行对比,发现二者平衡深度约为2 500 m,其上地层以增水为主,其下地层以耗水为主,并确定东营凹陷深部地层耗水区间为2 500~3 500 m.在有效耗水区间内,耗水作用可以改善储集层物性,增大油气储集空间,降低封闭流体压力,增大油气运聚动力差,有利于油气成藏。
Sediment changes may include the water consumption of mineral alteration,the compaction drainage action and the dehydration from clay minerals transformation,etc.during the burial diagenesis and compaction.This paper calculates the water drainage from deep strata compaction and the dehydration from clay minerals transformation in Dongying sag,compares the total water growth rate and the total water consumption at the same depth intervals,and indicates that the balanced depth between them is about 2 500 m,above which the strata are dominated by water increase,below which by water consumption.The water consumption intervals in the deep strata of Dongying sag range from 2 500 m to 3 500 m.Within the effective intervals the reservoir quality can be improved,including enlarging oil-gas storage space,reducing closed fluid pressure,enhancing oil-gas accumulation power,etc.These are all favorable for oil-gas accumulation in this area.
Sediment changes may include the water consumption of mineral alteration,the compaction drainage action and the dehydration from clay minerals transformation,etc.during the burial diagenesis and compaction.This paper calculates the water drainage from deep strata compaction and the dehydration from clay minerals transformation in Dongying sag,compares the total water growth rate and the total water consumption at the same depth intervals,and indicates that the balanced depth between them is about 2 500 m,above which the strata are dominated by water increase,below which by water consumption.The water consumption intervals in the deep strata of Dongying sag range from 2 500 m to 3 500 m.Within the effective intervals the reservoir quality can be improved,including enlarging oil-gas storage space,reducing closed fluid pressure,enhancing oil-gas accumulation power,etc.These are all favorable for oil-gas accumulation in this area.
引文
[1]张善文.东营凹陷古近系砂岩储层成岩耗水评价[J].现代地质,2009,23(4):719-723.
[2]冯增昭.沉积岩石学[M].北京:石油工业出版社,1993.
[3]张善文.成岩过程中的“耗水作用”及其石油地质意义[J].沉积学报,2007,25(5):701-707.
[4]张守鹏,滕建彬,王伟庆,等.胜利油区深层砂砾岩体成岩差异与储层控制因素[J].油气地质与采收率,2009,16(6):12-16.
[5]楼章华,高瑞祺,蔡希源,等.论松辽盆地流体历史与油气藏形成分析[M].贵阳:贵州科技出版社,1998.
[6]银燕.东营凹陷地层水水化学纵向分带性与成岩耗水系统划分[J].油气地质与采收率,2011,18(3):32-35.
[7]孙向阳,解习农.东营凹陷地层水化学特征与油气聚集关系[J].石油实验地质,2001,23(3):292-297.
[8]孙向阳.沉积盆地中地层水化学特征及其地质意义[J].天然气勘探与开发,2001,24(4):47-53.
[9]查明,陈中红.山东东营凹陷前古近系水化学场、水动力场与油气成藏[J].现代地质,2008,22(4):567-575.
[10]张小莉,查明,赫拴柱,等.渤海湾盆地廊固凹陷地层水化学纵向分带性与油气富集[J].石油实验地质,2006,28(2):187-190.
[2]冯增昭.沉积岩石学[M].北京:石油工业出版社,1993.
[3]张善文.成岩过程中的“耗水作用”及其石油地质意义[J].沉积学报,2007,25(5):701-707.
[4]张守鹏,滕建彬,王伟庆,等.胜利油区深层砂砾岩体成岩差异与储层控制因素[J].油气地质与采收率,2009,16(6):12-16.
[5]楼章华,高瑞祺,蔡希源,等.论松辽盆地流体历史与油气藏形成分析[M].贵阳:贵州科技出版社,1998.
[6]银燕.东营凹陷地层水水化学纵向分带性与成岩耗水系统划分[J].油气地质与采收率,2011,18(3):32-35.
[7]孙向阳,解习农.东营凹陷地层水化学特征与油气聚集关系[J].石油实验地质,2001,23(3):292-297.
[8]孙向阳.沉积盆地中地层水化学特征及其地质意义[J].天然气勘探与开发,2001,24(4):47-53.
[9]查明,陈中红.山东东营凹陷前古近系水化学场、水动力场与油气成藏[J].现代地质,2008,22(4):567-575.
[10]张小莉,查明,赫拴柱,等.渤海湾盆地廊固凹陷地层水化学纵向分带性与油气富集[J].石油实验地质,2006,28(2):187-190.